./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/weaver/popl20-min-max-inc.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 551b0097 Calling Ultimate with: /root/.sdkman/candidates/java/21.0.5-tem/bin/java -Dosgi.configuration.area=/storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/weaver/popl20-min-max-inc.wvr.c -s /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate-jdk21/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 341ac5a9697f243416924cef7ae19a5e9bc693a5982154ab196fb2faacf237d5 --- Real Ultimate output --- This is Ultimate 0.3.0-?-551b009-m [2025-01-10 01:08:26,985 INFO L188 SettingsManager]: Resetting all preferences to default values... [2025-01-10 01:08:27,054 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2025-01-10 01:08:27,057 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2025-01-10 01:08:27,058 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2025-01-10 01:08:27,072 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2025-01-10 01:08:27,072 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2025-01-10 01:08:27,072 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2025-01-10 01:08:27,073 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2025-01-10 01:08:27,073 INFO L153 SettingsManager]: * Use memory slicer=true [2025-01-10 01:08:27,073 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2025-01-10 01:08:27,073 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2025-01-10 01:08:27,073 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2025-01-10 01:08:27,073 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2025-01-10 01:08:27,073 INFO L153 SettingsManager]: * Use SBE=true [2025-01-10 01:08:27,074 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * sizeof long=4 [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * sizeof POINTER=4 [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2025-01-10 01:08:27,074 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2025-01-10 01:08:27,075 INFO L153 SettingsManager]: * sizeof long double=12 [2025-01-10 01:08:27,075 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2025-01-10 01:08:27,075 INFO L153 SettingsManager]: * Use constant arrays=true [2025-01-10 01:08:27,075 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2025-01-10 01:08:27,075 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-01-10 01:08:27,075 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-01-10 01:08:27,075 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-01-10 01:08:27,075 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-01-10 01:08:27,075 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2025-01-10 01:08:27,075 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-01-10 01:08:27,076 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2025-01-10 01:08:27,076 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2025-01-10 01:08:27,077 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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-jdk21/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 -> 341ac5a9697f243416924cef7ae19a5e9bc693a5982154ab196fb2faacf237d5 [2025-01-10 01:08:27,271 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2025-01-10 01:08:27,283 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2025-01-10 01:08:27,286 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2025-01-10 01:08:27,287 INFO L270 PluginConnector]: Initializing CDTParser... [2025-01-10 01:08:27,288 INFO L274 PluginConnector]: CDTParser initialized [2025-01-10 01:08:27,289 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/weaver/popl20-min-max-inc.wvr.c [2025-01-10 01:08:28,469 INFO L533 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data/9708f2ba7/72abf06a2f694e22959d40f87ca1f0ff/FLAG803134c6b [2025-01-10 01:08:28,802 INFO L384 CDTParser]: Found 1 translation units. [2025-01-10 01:08:28,803 INFO L180 CDTParser]: Scanning /storage/repos/ultimate-jdk21/releaseScripts/default/sv-benchmarks/c/weaver/popl20-min-max-inc.wvr.c [2025-01-10 01:08:28,812 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data/9708f2ba7/72abf06a2f694e22959d40f87ca1f0ff/FLAG803134c6b [2025-01-10 01:08:29,066 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data/9708f2ba7/72abf06a2f694e22959d40f87ca1f0ff [2025-01-10 01:08:29,068 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2025-01-10 01:08:29,070 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2025-01-10 01:08:29,072 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2025-01-10 01:08:29,072 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2025-01-10 01:08:29,076 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2025-01-10 01:08:29,081 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,083 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b7b8d60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29, skipping insertion in model container [2025-01-10 01:08:29,083 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,099 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-01-10 01:08:29,227 WARN L1100 CHandler]: saw a pointer cast to a type that we could not get a type size for, not adapting memory model [2025-01-10 01:08:29,230 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-01-10 01:08:29,240 INFO L200 MainTranslator]: Completed pre-run [2025-01-10 01:08:29,265 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-01-10 01:08:29,279 INFO L204 MainTranslator]: Completed translation [2025-01-10 01:08:29,280 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29 WrapperNode [2025-01-10 01:08:29,280 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2025-01-10 01:08:29,281 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2025-01-10 01:08:29,281 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2025-01-10 01:08:29,281 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2025-01-10 01:08:29,285 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,294 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,313 INFO L138 Inliner]: procedures = 23, calls = 26, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 114 [2025-01-10 01:08:29,313 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2025-01-10 01:08:29,314 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2025-01-10 01:08:29,314 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2025-01-10 01:08:29,314 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2025-01-10 01:08:29,320 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,321 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,323 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,346 INFO L175 MemorySlicer]: Split 10 memory accesses to 2 slices as follows [2, 8]. 80 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0]. The 2 writes are split as follows [0, 2]. [2025-01-10 01:08:29,346 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,346 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,354 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,355 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,357 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,361 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,362 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,365 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2025-01-10 01:08:29,366 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2025-01-10 01:08:29,366 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2025-01-10 01:08:29,366 INFO L274 PluginConnector]: RCFGBuilder initialized [2025-01-10 01:08:29,367 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (1/1) ... [2025-01-10 01:08:29,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-01-10 01:08:29,382 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:08:29,397 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2025-01-10 01:08:29,410 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2025-01-10 01:08:29,424 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2025-01-10 01:08:29,424 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2025-01-10 01:08:29,425 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2025-01-10 01:08:29,425 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2025-01-10 01:08:29,425 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2025-01-10 01:08:29,425 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2025-01-10 01:08:29,425 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2025-01-10 01:08:29,425 INFO L130 BoogieDeclarations]: Found specification of procedure thread4 [2025-01-10 01:08:29,425 INFO L138 BoogieDeclarations]: Found implementation of procedure thread4 [2025-01-10 01:08:29,425 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2025-01-10 01:08:29,425 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2025-01-10 01:08:29,425 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2025-01-10 01:08:29,425 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2025-01-10 01:08:29,426 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2025-01-10 01:08:29,426 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2025-01-10 01:08:29,426 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2025-01-10 01:08:29,426 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2025-01-10 01:08:29,426 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2025-01-10 01:08:29,427 WARN L203 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement. [2025-01-10 01:08:29,502 INFO L234 CfgBuilder]: Building ICFG [2025-01-10 01:08:29,503 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2025-01-10 01:08:29,772 INFO L279 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2025-01-10 01:08:29,772 INFO L283 CfgBuilder]: Performing block encoding [2025-01-10 01:08:29,909 INFO L307 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2025-01-10 01:08:29,909 INFO L312 CfgBuilder]: Removed 0 assume(true) statements. [2025-01-10 01:08:29,909 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.01 01:08:29 BoogieIcfgContainer [2025-01-10 01:08:29,909 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2025-01-10 01:08:29,911 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2025-01-10 01:08:29,911 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2025-01-10 01:08:29,915 INFO L274 PluginConnector]: TraceAbstraction initialized [2025-01-10 01:08:29,915 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.01 01:08:29" (1/3) ... [2025-01-10 01:08:29,915 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3630f6a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.01 01:08:29, skipping insertion in model container [2025-01-10 01:08:29,915 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 01:08:29" (2/3) ... [2025-01-10 01:08:29,916 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3630f6a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.01 01:08:29, skipping insertion in model container [2025-01-10 01:08:29,916 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.01 01:08:29" (3/3) ... [2025-01-10 01:08:29,917 INFO L128 eAbstractionObserver]: Analyzing ICFG popl20-min-max-inc.wvr.c [2025-01-10 01:08:29,926 INFO L216 ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2025-01-10 01:08:29,927 INFO L151 ceAbstractionStarter]: Applying trace abstraction to ICFG popl20-min-max-inc.wvr.c that has 5 procedures, 76 locations, 1 initial locations, 4 loop locations, and 18 error locations. [2025-01-10 01:08:29,928 INFO L491 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2025-01-10 01:08:29,983 INFO L143 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2025-01-10 01:08:30,008 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 88 places, 81 transitions, 190 flow [2025-01-10 01:08:30,034 INFO L124 PetriNetUnfolderBase]: 6/77 cut-off events. [2025-01-10 01:08:30,036 INFO L125 PetriNetUnfolderBase]: For 4/4 co-relation queries the response was YES. [2025-01-10 01:08:30,039 INFO L83 FinitePrefix]: Finished finitePrefix Result has 94 conditions, 77 events. 6/77 cut-off events. For 4/4 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 225 event pairs, 0 based on Foata normal form. 0/53 useless extension candidates. Maximal degree in co-relation 69. Up to 2 conditions per place. [2025-01-10 01:08:30,039 INFO L82 GeneralOperation]: Start removeDead. Operand has 88 places, 81 transitions, 190 flow [2025-01-10 01:08:30,042 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 83 places, 76 transitions, 176 flow [2025-01-10 01:08:30,049 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-01-10 01:08:30,056 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;@44c65dd3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-01-10 01:08:30,056 INFO L334 AbstractCegarLoop]: Starting to check reachability of 36 error locations. [2025-01-10 01:08:30,061 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-01-10 01:08:30,061 INFO L124 PetriNetUnfolderBase]: 1/6 cut-off events. [2025-01-10 01:08:30,062 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2025-01-10 01:08:30,062 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:30,062 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2025-01-10 01:08:30,062 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:30,068 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:30,068 INFO L85 PathProgramCache]: Analyzing trace with hash 471732702, now seen corresponding path program 1 times [2025-01-10 01:08:30,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:30,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308159924] [2025-01-10 01:08:30,073 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:30,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:30,121 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-01-10 01:08:30,133 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-01-10 01:08:30,133 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:30,133 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:30,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:30,231 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:30,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308159924] [2025-01-10 01:08:30,232 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308159924] provided 1 perfect and 0 imperfect interpolant sequences [2025-01-10 01:08:30,232 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-01-10 01:08:30,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-01-10 01:08:30,259 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245919816] [2025-01-10 01:08:30,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-01-10 01:08:30,267 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2025-01-10 01:08:30,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:30,288 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2025-01-10 01:08:30,288 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2025-01-10 01:08:30,298 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 81 [2025-01-10 01:08:30,301 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 76 transitions, 176 flow. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:30,301 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:30,302 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 81 [2025-01-10 01:08:30,302 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:32,996 INFO L124 PetriNetUnfolderBase]: 32532/45436 cut-off events. [2025-01-10 01:08:32,996 INFO L125 PetriNetUnfolderBase]: For 1364/1364 co-relation queries the response was YES. [2025-01-10 01:08:33,108 INFO L83 FinitePrefix]: Finished finitePrefix Result has 87794 conditions, 45436 events. 32532/45436 cut-off events. For 1364/1364 co-relation queries the response was YES. Maximal size of possible extension queue 2701. Compared 334209 event pairs, 23751 based on Foata normal form. 1/29891 useless extension candidates. Maximal degree in co-relation 84883. Up to 39794 conditions per place. [2025-01-10 01:08:33,290 INFO L140 encePairwiseOnDemand]: 75/81 looper letters, 46 selfloop transitions, 2 changer transitions 0/71 dead transitions. [2025-01-10 01:08:33,290 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 71 transitions, 262 flow [2025-01-10 01:08:33,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2025-01-10 01:08:33,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2025-01-10 01:08:33,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 136 transitions. [2025-01-10 01:08:33,302 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5596707818930041 [2025-01-10 01:08:33,304 INFO L175 Difference]: Start difference. First operand has 83 places, 76 transitions, 176 flow. Second operand 3 states and 136 transitions. [2025-01-10 01:08:33,304 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 71 transitions, 262 flow [2025-01-10 01:08:33,458 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 71 transitions, 246 flow, removed 0 selfloop flow, removed 8 redundant places. [2025-01-10 01:08:33,462 INFO L231 Difference]: Finished difference. Result has 72 places, 71 transitions, 154 flow [2025-01-10 01:08:33,464 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=150, PETRI_DIFFERENCE_MINUEND_PLACES=70, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=154, PETRI_PLACES=72, PETRI_TRANSITIONS=71} [2025-01-10 01:08:33,466 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, -11 predicate places. [2025-01-10 01:08:33,468 INFO L471 AbstractCegarLoop]: Abstraction has has 72 places, 71 transitions, 154 flow [2025-01-10 01:08:33,468 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:33,468 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:33,469 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2025-01-10 01:08:33,469 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2025-01-10 01:08:33,469 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:33,469 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:33,470 INFO L85 PathProgramCache]: Analyzing trace with hash 471732703, now seen corresponding path program 1 times [2025-01-10 01:08:33,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:33,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753203873] [2025-01-10 01:08:33,471 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:33,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:33,480 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-01-10 01:08:33,502 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-01-10 01:08:33,504 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:33,505 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:33,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:33,752 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:33,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753203873] [2025-01-10 01:08:33,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753203873] provided 1 perfect and 0 imperfect interpolant sequences [2025-01-10 01:08:33,752 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-01-10 01:08:33,753 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-01-10 01:08:33,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209234747] [2025-01-10 01:08:33,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-01-10 01:08:33,754 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-01-10 01:08:33,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:33,755 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-01-10 01:08:33,755 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2025-01-10 01:08:33,777 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 27 out of 81 [2025-01-10 01:08:33,779 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 71 transitions, 154 flow. Second operand has 6 states, 6 states have (on average 27.833333333333332) internal successors, (167), 6 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:33,780 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:33,780 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 27 of 81 [2025-01-10 01:08:33,780 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:35,883 INFO L124 PetriNetUnfolderBase]: 32532/45438 cut-off events. [2025-01-10 01:08:35,884 INFO L125 PetriNetUnfolderBase]: For 156/156 co-relation queries the response was YES. [2025-01-10 01:08:35,940 INFO L83 FinitePrefix]: Finished finitePrefix Result has 86354 conditions, 45438 events. 32532/45438 cut-off events. For 156/156 co-relation queries the response was YES. Maximal size of possible extension queue 2701. Compared 333543 event pairs, 23751 based on Foata normal form. 1/29893 useless extension candidates. Maximal degree in co-relation 86331. Up to 39796 conditions per place. [2025-01-10 01:08:36,078 INFO L140 encePairwiseOnDemand]: 76/81 looper letters, 49 selfloop transitions, 3 changer transitions 0/73 dead transitions. [2025-01-10 01:08:36,078 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 76 places, 73 transitions, 262 flow [2025-01-10 01:08:36,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-01-10 01:08:36,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-01-10 01:08:36,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 189 transitions. [2025-01-10 01:08:36,081 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.4666666666666667 [2025-01-10 01:08:36,081 INFO L175 Difference]: Start difference. First operand has 72 places, 71 transitions, 154 flow. Second operand 5 states and 189 transitions. [2025-01-10 01:08:36,081 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 76 places, 73 transitions, 262 flow [2025-01-10 01:08:36,082 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 73 transitions, 258 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-01-10 01:08:36,083 INFO L231 Difference]: Finished difference. Result has 75 places, 72 transitions, 166 flow [2025-01-10 01:08:36,083 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=150, PETRI_DIFFERENCE_MINUEND_PLACES=70, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=68, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=166, PETRI_PLACES=75, PETRI_TRANSITIONS=72} [2025-01-10 01:08:36,084 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, -8 predicate places. [2025-01-10 01:08:36,084 INFO L471 AbstractCegarLoop]: Abstraction has has 75 places, 72 transitions, 166 flow [2025-01-10 01:08:36,084 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 27.833333333333332) internal successors, (167), 6 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:36,084 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:36,084 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2025-01-10 01:08:36,084 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2025-01-10 01:08:36,084 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:36,085 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:36,085 INFO L85 PathProgramCache]: Analyzing trace with hash -1931390511, now seen corresponding path program 1 times [2025-01-10 01:08:36,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:36,085 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116059623] [2025-01-10 01:08:36,085 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:36,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:36,091 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 7 statements into 1 equivalence classes. [2025-01-10 01:08:36,102 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 7 of 7 statements. [2025-01-10 01:08:36,102 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:36,102 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:36,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:36,336 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:36,336 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116059623] [2025-01-10 01:08:36,336 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116059623] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:08:36,336 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6835031] [2025-01-10 01:08:36,336 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:36,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:36,337 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:08:36,345 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:08:36,346 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2025-01-10 01:08:36,388 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 7 statements into 1 equivalence classes. [2025-01-10 01:08:36,398 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 7 of 7 statements. [2025-01-10 01:08:36,398 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:36,398 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:36,399 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 15 conjuncts are in the unsatisfiable core [2025-01-10 01:08:36,402 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:08:36,442 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2025-01-10 01:08:36,534 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:36,535 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-01-10 01:08:36,667 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:36,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6835031] provided 0 perfect and 2 imperfect interpolant sequences [2025-01-10 01:08:36,668 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-01-10 01:08:36,668 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 13 [2025-01-10 01:08:36,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628599793] [2025-01-10 01:08:36,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-01-10 01:08:36,668 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2025-01-10 01:08:36,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:36,669 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2025-01-10 01:08:36,670 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2025-01-10 01:08:36,757 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 27 out of 81 [2025-01-10 01:08:36,758 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 72 transitions, 166 flow. Second operand has 15 states, 15 states have (on average 28.266666666666666) internal successors, (424), 15 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:36,759 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:36,759 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 27 of 81 [2025-01-10 01:08:36,759 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:38,828 INFO L124 PetriNetUnfolderBase]: 32533/45440 cut-off events. [2025-01-10 01:08:38,829 INFO L125 PetriNetUnfolderBase]: For 157/157 co-relation queries the response was YES. [2025-01-10 01:08:38,910 INFO L83 FinitePrefix]: Finished finitePrefix Result has 86365 conditions, 45440 events. 32533/45440 cut-off events. For 157/157 co-relation queries the response was YES. Maximal size of possible extension queue 2701. Compared 333471 event pairs, 23751 based on Foata normal form. 0/29895 useless extension candidates. Maximal degree in co-relation 86347. Up to 39793 conditions per place. [2025-01-10 01:08:39,072 INFO L140 encePairwiseOnDemand]: 75/81 looper letters, 45 selfloop transitions, 9 changer transitions 0/75 dead transitions. [2025-01-10 01:08:39,072 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 75 transitions, 282 flow [2025-01-10 01:08:39,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2025-01-10 01:08:39,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2025-01-10 01:08:39,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 299 transitions. [2025-01-10 01:08:39,074 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.4101508916323731 [2025-01-10 01:08:39,074 INFO L175 Difference]: Start difference. First operand has 75 places, 72 transitions, 166 flow. Second operand 9 states and 299 transitions. [2025-01-10 01:08:39,074 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 75 transitions, 282 flow [2025-01-10 01:08:39,075 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 80 places, 75 transitions, 279 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-01-10 01:08:39,076 INFO L231 Difference]: Finished difference. Result has 80 places, 75 transitions, 191 flow [2025-01-10 01:08:39,076 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=159, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=191, PETRI_PLACES=80, PETRI_TRANSITIONS=75} [2025-01-10 01:08:39,077 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, -3 predicate places. [2025-01-10 01:08:39,077 INFO L471 AbstractCegarLoop]: Abstraction has has 80 places, 75 transitions, 191 flow [2025-01-10 01:08:39,077 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 28.266666666666666) internal successors, (424), 15 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:39,077 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:39,078 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:08:39,086 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2025-01-10 01:08:39,282 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:39,282 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:39,283 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:39,283 INFO L85 PathProgramCache]: Analyzing trace with hash -640295881, now seen corresponding path program 1 times [2025-01-10 01:08:39,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:39,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022659767] [2025-01-10 01:08:39,283 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:39,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:39,296 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 9 statements into 1 equivalence classes. [2025-01-10 01:08:39,307 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 9 of 9 statements. [2025-01-10 01:08:39,307 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:39,307 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:39,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:39,361 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:39,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2022659767] [2025-01-10 01:08:39,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2022659767] provided 1 perfect and 0 imperfect interpolant sequences [2025-01-10 01:08:39,361 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-01-10 01:08:39,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-01-10 01:08:39,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876838895] [2025-01-10 01:08:39,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-01-10 01:08:39,362 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-01-10 01:08:39,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:39,362 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-01-10 01:08:39,362 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-01-10 01:08:39,367 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 81 [2025-01-10 01:08:39,367 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 80 places, 75 transitions, 191 flow. Second operand has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:39,368 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:39,368 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 81 [2025-01-10 01:08:39,368 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:40,556 INFO L124 PetriNetUnfolderBase]: 16596/23801 cut-off events. [2025-01-10 01:08:40,557 INFO L125 PetriNetUnfolderBase]: For 105/105 co-relation queries the response was YES. [2025-01-10 01:08:40,593 INFO L83 FinitePrefix]: Finished finitePrefix Result has 44635 conditions, 23801 events. 16596/23801 cut-off events. For 105/105 co-relation queries the response was YES. Maximal size of possible extension queue 1400. Compared 167645 event pairs, 11993 based on Foata normal form. 0/18148 useless extension candidates. Maximal degree in co-relation 44615. Up to 20220 conditions per place. [2025-01-10 01:08:40,655 INFO L140 encePairwiseOnDemand]: 73/81 looper letters, 44 selfloop transitions, 3 changer transitions 0/69 dead transitions. [2025-01-10 01:08:40,655 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 77 places, 69 transitions, 273 flow [2025-01-10 01:08:40,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-01-10 01:08:40,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-01-10 01:08:40,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 160 transitions. [2025-01-10 01:08:40,657 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.49382716049382713 [2025-01-10 01:08:40,657 INFO L175 Difference]: Start difference. First operand has 80 places, 75 transitions, 191 flow. Second operand 4 states and 160 transitions. [2025-01-10 01:08:40,657 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 77 places, 69 transitions, 273 flow [2025-01-10 01:08:40,657 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 69 transitions, 258 flow, removed 4 selfloop flow, removed 4 redundant places. [2025-01-10 01:08:40,658 INFO L231 Difference]: Finished difference. Result has 73 places, 69 transitions, 170 flow [2025-01-10 01:08:40,658 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=164, PETRI_DIFFERENCE_MINUEND_PLACES=70, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=66, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=170, PETRI_PLACES=73, PETRI_TRANSITIONS=69} [2025-01-10 01:08:40,659 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, -10 predicate places. [2025-01-10 01:08:40,659 INFO L471 AbstractCegarLoop]: Abstraction has has 73 places, 69 transitions, 170 flow [2025-01-10 01:08:40,659 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:40,659 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:40,659 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:08:40,659 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2025-01-10 01:08:40,659 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:40,659 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:40,660 INFO L85 PathProgramCache]: Analyzing trace with hash -640295880, now seen corresponding path program 1 times [2025-01-10 01:08:40,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:40,660 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451624842] [2025-01-10 01:08:40,660 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:40,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:40,668 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 9 statements into 1 equivalence classes. [2025-01-10 01:08:40,673 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 9 of 9 statements. [2025-01-10 01:08:40,674 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:40,674 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:40,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:40,818 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:40,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451624842] [2025-01-10 01:08:40,818 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451624842] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:08:40,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843105998] [2025-01-10 01:08:40,818 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:40,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:40,818 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:08:40,823 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:08:40,830 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2025-01-10 01:08:40,866 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 9 statements into 1 equivalence classes. [2025-01-10 01:08:40,877 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 9 of 9 statements. [2025-01-10 01:08:40,877 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:40,877 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:40,878 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 12 conjuncts are in the unsatisfiable core [2025-01-10 01:08:40,879 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:08:40,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:40,933 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-01-10 01:08:40,948 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2025-01-10 01:08:40,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:40,961 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843105998] provided 0 perfect and 2 imperfect interpolant sequences [2025-01-10 01:08:40,961 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-01-10 01:08:40,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2025-01-10 01:08:40,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210290814] [2025-01-10 01:08:40,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-01-10 01:08:40,961 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2025-01-10 01:08:40,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:40,962 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2025-01-10 01:08:40,962 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2025-01-10 01:08:40,978 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 29 out of 81 [2025-01-10 01:08:40,978 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 69 transitions, 170 flow. Second operand has 8 states, 8 states have (on average 30.625) internal successors, (245), 8 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:40,978 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:40,978 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 29 of 81 [2025-01-10 01:08:40,979 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:41,727 INFO L124 PetriNetUnfolderBase]: 13094/18865 cut-off events. [2025-01-10 01:08:41,727 INFO L125 PetriNetUnfolderBase]: For 94/94 co-relation queries the response was YES. [2025-01-10 01:08:41,761 INFO L83 FinitePrefix]: Finished finitePrefix Result has 35157 conditions, 18865 events. 13094/18865 cut-off events. For 94/94 co-relation queries the response was YES. Maximal size of possible extension queue 1218. Compared 130361 event pairs, 9124 based on Foata normal form. 0/15035 useless extension candidates. Maximal degree in co-relation 35140. Up to 15819 conditions per place. [2025-01-10 01:08:41,814 INFO L140 encePairwiseOnDemand]: 76/81 looper letters, 41 selfloop transitions, 4 changer transitions 0/67 dead transitions. [2025-01-10 01:08:41,814 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 67 transitions, 256 flow [2025-01-10 01:08:41,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-01-10 01:08:41,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-01-10 01:08:41,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 189 transitions. [2025-01-10 01:08:41,816 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.4666666666666667 [2025-01-10 01:08:41,817 INFO L175 Difference]: Start difference. First operand has 73 places, 69 transitions, 170 flow. Second operand 5 states and 189 transitions. [2025-01-10 01:08:41,817 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 67 transitions, 256 flow [2025-01-10 01:08:41,817 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 67 transitions, 252 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-01-10 01:08:41,818 INFO L231 Difference]: Finished difference. Result has 73 places, 67 transitions, 170 flow [2025-01-10 01:08:41,818 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=162, PETRI_DIFFERENCE_MINUEND_PLACES=69, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=170, PETRI_PLACES=73, PETRI_TRANSITIONS=67} [2025-01-10 01:08:41,818 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, -10 predicate places. [2025-01-10 01:08:41,819 INFO L471 AbstractCegarLoop]: Abstraction has has 73 places, 67 transitions, 170 flow [2025-01-10 01:08:41,819 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 30.625) internal successors, (245), 8 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:41,819 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:41,819 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:08:41,826 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2025-01-10 01:08:42,023 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:42,023 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:42,024 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:42,024 INFO L85 PathProgramCache]: Analyzing trace with hash 148193316, now seen corresponding path program 1 times [2025-01-10 01:08:42,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:42,024 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088725982] [2025-01-10 01:08:42,024 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:42,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:42,033 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 14 statements into 1 equivalence classes. [2025-01-10 01:08:42,039 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 14 of 14 statements. [2025-01-10 01:08:42,039 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:42,039 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:42,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:42,175 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:42,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088725982] [2025-01-10 01:08:42,175 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088725982] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:08:42,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8519525] [2025-01-10 01:08:42,176 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:42,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:42,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:08:42,177 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:08:42,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2025-01-10 01:08:42,215 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 14 statements into 1 equivalence classes. [2025-01-10 01:08:42,230 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 14 of 14 statements. [2025-01-10 01:08:42,230 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:42,230 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:42,231 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjuncts are in the unsatisfiable core [2025-01-10 01:08:42,232 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:08:42,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:42,298 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-01-10 01:08:42,335 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2025-01-10 01:08:42,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:42,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8519525] provided 0 perfect and 2 imperfect interpolant sequences [2025-01-10 01:08:42,343 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-01-10 01:08:42,343 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2025-01-10 01:08:42,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755738633] [2025-01-10 01:08:42,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-01-10 01:08:42,343 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2025-01-10 01:08:42,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:42,344 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2025-01-10 01:08:42,344 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2025-01-10 01:08:42,371 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 29 out of 81 [2025-01-10 01:08:42,372 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 67 transitions, 170 flow. Second operand has 11 states, 11 states have (on average 31.272727272727273) internal successors, (344), 11 states have internal predecessors, (344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:42,372 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:42,372 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 29 of 81 [2025-01-10 01:08:42,372 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:43,425 INFO L124 PetriNetUnfolderBase]: 18150/25485 cut-off events. [2025-01-10 01:08:43,425 INFO L125 PetriNetUnfolderBase]: For 181/181 co-relation queries the response was YES. [2025-01-10 01:08:43,482 INFO L83 FinitePrefix]: Finished finitePrefix Result has 48139 conditions, 25485 events. 18150/25485 cut-off events. For 181/181 co-relation queries the response was YES. Maximal size of possible extension queue 1454. Compared 170529 event pairs, 4988 based on Foata normal form. 0/21453 useless extension candidates. Maximal degree in co-relation 48121. Up to 8507 conditions per place. [2025-01-10 01:08:43,557 INFO L140 encePairwiseOnDemand]: 72/81 looper letters, 78 selfloop transitions, 9 changer transitions 0/109 dead transitions. [2025-01-10 01:08:43,557 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 109 transitions, 434 flow [2025-01-10 01:08:43,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-01-10 01:08:43,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-01-10 01:08:43,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 290 transitions. [2025-01-10 01:08:43,559 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5114638447971781 [2025-01-10 01:08:43,559 INFO L175 Difference]: Start difference. First operand has 73 places, 67 transitions, 170 flow. Second operand 7 states and 290 transitions. [2025-01-10 01:08:43,559 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 109 transitions, 434 flow [2025-01-10 01:08:43,560 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 109 transitions, 428 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-01-10 01:08:43,561 INFO L231 Difference]: Finished difference. Result has 77 places, 69 transitions, 202 flow [2025-01-10 01:08:43,561 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=162, PETRI_DIFFERENCE_MINUEND_PLACES=69, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=66, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=58, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=202, PETRI_PLACES=77, PETRI_TRANSITIONS=69} [2025-01-10 01:08:43,562 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, -6 predicate places. [2025-01-10 01:08:43,562 INFO L471 AbstractCegarLoop]: Abstraction has has 77 places, 69 transitions, 202 flow [2025-01-10 01:08:43,562 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 31.272727272727273) internal successors, (344), 11 states have internal predecessors, (344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:43,562 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:43,562 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:08:43,569 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2025-01-10 01:08:43,768 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:43,768 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:43,769 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:43,769 INFO L85 PathProgramCache]: Analyzing trace with hash -1893475970, now seen corresponding path program 1 times [2025-01-10 01:08:43,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:43,769 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646413433] [2025-01-10 01:08:43,769 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:43,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:43,775 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 15 statements into 1 equivalence classes. [2025-01-10 01:08:43,779 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 15 of 15 statements. [2025-01-10 01:08:43,782 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:43,782 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:43,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:43,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:43,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646413433] [2025-01-10 01:08:43,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646413433] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:08:43,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751175175] [2025-01-10 01:08:43,953 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:43,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:43,953 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:08:43,956 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:08:43,960 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2025-01-10 01:08:43,997 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 15 statements into 1 equivalence classes. [2025-01-10 01:08:44,007 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 15 of 15 statements. [2025-01-10 01:08:44,008 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:44,008 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:44,009 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjuncts are in the unsatisfiable core [2025-01-10 01:08:44,010 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:08:44,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2025-01-10 01:08:44,047 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-01-10 01:08:44,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751175175] provided 1 perfect and 0 imperfect interpolant sequences [2025-01-10 01:08:44,047 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2025-01-10 01:08:44,048 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 7 [2025-01-10 01:08:44,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968166848] [2025-01-10 01:08:44,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-01-10 01:08:44,048 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-01-10 01:08:44,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:44,048 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-01-10 01:08:44,048 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2025-01-10 01:08:44,054 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 81 [2025-01-10 01:08:44,054 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 69 transitions, 202 flow. Second operand has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:44,054 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:44,055 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 81 [2025-01-10 01:08:44,055 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:45,674 INFO L124 PetriNetUnfolderBase]: 22097/35422 cut-off events. [2025-01-10 01:08:45,674 INFO L125 PetriNetUnfolderBase]: For 8698/8698 co-relation queries the response was YES. [2025-01-10 01:08:45,819 INFO L83 FinitePrefix]: Finished finitePrefix Result has 69186 conditions, 35422 events. 22097/35422 cut-off events. For 8698/8698 co-relation queries the response was YES. Maximal size of possible extension queue 1255. Compared 275810 event pairs, 2687 based on Foata normal form. 0/31587 useless extension candidates. Maximal degree in co-relation 69166. Up to 17941 conditions per place. [2025-01-10 01:08:45,953 INFO L140 encePairwiseOnDemand]: 75/81 looper letters, 93 selfloop transitions, 5 changer transitions 0/119 dead transitions. [2025-01-10 01:08:45,953 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 119 transitions, 552 flow [2025-01-10 01:08:45,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-01-10 01:08:45,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-01-10 01:08:45,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 197 transitions. [2025-01-10 01:08:45,954 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6080246913580247 [2025-01-10 01:08:45,954 INFO L175 Difference]: Start difference. First operand has 77 places, 69 transitions, 202 flow. Second operand 4 states and 197 transitions. [2025-01-10 01:08:45,954 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 119 transitions, 552 flow [2025-01-10 01:08:45,964 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 119 transitions, 546 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-01-10 01:08:45,966 INFO L231 Difference]: Finished difference. Result has 79 places, 73 transitions, 229 flow [2025-01-10 01:08:45,966 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=196, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=64, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=229, PETRI_PLACES=79, PETRI_TRANSITIONS=73} [2025-01-10 01:08:45,966 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, -4 predicate places. [2025-01-10 01:08:45,967 INFO L471 AbstractCegarLoop]: Abstraction has has 79 places, 73 transitions, 229 flow [2025-01-10 01:08:45,967 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:45,967 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:45,967 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:08:45,972 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2025-01-10 01:08:46,171 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2025-01-10 01:08:46,171 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:46,172 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:46,172 INFO L85 PathProgramCache]: Analyzing trace with hash 1871877780, now seen corresponding path program 1 times [2025-01-10 01:08:46,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:46,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075627668] [2025-01-10 01:08:46,172 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:46,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:46,178 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 17 statements into 1 equivalence classes. [2025-01-10 01:08:46,185 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 17 of 17 statements. [2025-01-10 01:08:46,185 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:46,185 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:46,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:46,335 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:46,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075627668] [2025-01-10 01:08:46,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075627668] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:08:46,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542548006] [2025-01-10 01:08:46,336 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:46,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:46,336 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:08:46,337 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:08:46,339 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2025-01-10 01:08:46,379 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 17 statements into 1 equivalence classes. [2025-01-10 01:08:46,391 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 17 of 17 statements. [2025-01-10 01:08:46,391 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:46,391 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:46,392 INFO L256 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 5 conjuncts are in the unsatisfiable core [2025-01-10 01:08:46,392 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:08:46,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2025-01-10 01:08:46,427 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-01-10 01:08:46,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542548006] provided 1 perfect and 0 imperfect interpolant sequences [2025-01-10 01:08:46,427 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2025-01-10 01:08:46,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 7 [2025-01-10 01:08:46,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722066074] [2025-01-10 01:08:46,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-01-10 01:08:46,428 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-01-10 01:08:46,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:46,428 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-01-10 01:08:46,428 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2025-01-10 01:08:46,433 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 81 [2025-01-10 01:08:46,434 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 73 transitions, 229 flow. Second operand has 4 states, 4 states have (on average 30.75) internal successors, (123), 4 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:46,434 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:46,434 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 81 [2025-01-10 01:08:46,434 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:49,080 INFO L124 PetriNetUnfolderBase]: 31336/48672 cut-off events. [2025-01-10 01:08:49,081 INFO L125 PetriNetUnfolderBase]: For 17743/19183 co-relation queries the response was YES. [2025-01-10 01:08:49,289 INFO L83 FinitePrefix]: Finished finitePrefix Result has 104213 conditions, 48672 events. 31336/48672 cut-off events. For 17743/19183 co-relation queries the response was YES. Maximal size of possible extension queue 1577. Compared 376562 event pairs, 4070 based on Foata normal form. 1440/46099 useless extension candidates. Maximal degree in co-relation 104194. Up to 26029 conditions per place. [2025-01-10 01:08:49,485 INFO L140 encePairwiseOnDemand]: 75/81 looper letters, 96 selfloop transitions, 5 changer transitions 0/122 dead transitions. [2025-01-10 01:08:49,485 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 122 transitions, 597 flow [2025-01-10 01:08:49,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-01-10 01:08:49,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-01-10 01:08:49,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 196 transitions. [2025-01-10 01:08:49,486 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6049382716049383 [2025-01-10 01:08:49,486 INFO L175 Difference]: Start difference. First operand has 79 places, 73 transitions, 229 flow. Second operand 4 states and 196 transitions. [2025-01-10 01:08:49,486 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 122 transitions, 597 flow [2025-01-10 01:08:49,496 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 81 places, 122 transitions, 590 flow, removed 0 selfloop flow, removed 1 redundant places. [2025-01-10 01:08:49,497 INFO L231 Difference]: Finished difference. Result has 82 places, 75 transitions, 247 flow [2025-01-10 01:08:49,497 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=224, PETRI_DIFFERENCE_MINUEND_PLACES=78, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=73, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=68, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=247, PETRI_PLACES=82, PETRI_TRANSITIONS=75} [2025-01-10 01:08:49,498 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, -1 predicate places. [2025-01-10 01:08:49,498 INFO L471 AbstractCegarLoop]: Abstraction has has 82 places, 75 transitions, 247 flow [2025-01-10 01:08:49,498 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.75) internal successors, (123), 4 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:49,498 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:49,498 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:08:49,504 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2025-01-10 01:08:49,698 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:49,699 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:49,699 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:49,699 INFO L85 PathProgramCache]: Analyzing trace with hash -924761243, now seen corresponding path program 1 times [2025-01-10 01:08:49,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:49,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691948722] [2025-01-10 01:08:49,699 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:49,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:49,706 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-01-10 01:08:49,712 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-01-10 01:08:49,714 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:49,714 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:49,793 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:49,793 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:49,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691948722] [2025-01-10 01:08:49,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691948722] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:08:49,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967719087] [2025-01-10 01:08:49,793 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:49,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:49,793 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:08:49,798 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:08:49,798 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2025-01-10 01:08:49,842 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-01-10 01:08:49,858 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-01-10 01:08:49,859 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:49,859 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:49,860 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-01-10 01:08:49,861 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:08:49,923 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:49,923 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-01-10 01:08:49,981 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:49,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967719087] provided 0 perfect and 2 imperfect interpolant sequences [2025-01-10 01:08:49,981 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-01-10 01:08:49,981 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2025-01-10 01:08:49,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737777581] [2025-01-10 01:08:49,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-01-10 01:08:49,982 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2025-01-10 01:08:49,982 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:49,982 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2025-01-10 01:08:49,982 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2025-01-10 01:08:50,026 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 27 out of 81 [2025-01-10 01:08:50,027 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 82 places, 75 transitions, 247 flow. Second operand has 14 states, 14 states have (on average 29.857142857142858) internal successors, (418), 14 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:50,027 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:50,028 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 27 of 81 [2025-01-10 01:08:50,028 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:54,232 INFO L124 PetriNetUnfolderBase]: 50882/71194 cut-off events. [2025-01-10 01:08:54,232 INFO L125 PetriNetUnfolderBase]: For 29680/35799 co-relation queries the response was YES. [2025-01-10 01:08:54,482 INFO L83 FinitePrefix]: Finished finitePrefix Result has 172511 conditions, 71194 events. 50882/71194 cut-off events. For 29680/35799 co-relation queries the response was YES. Maximal size of possible extension queue 2831. Compared 519447 event pairs, 27591 based on Foata normal form. 6797/75569 useless extension candidates. Maximal degree in co-relation 172489. Up to 39302 conditions per place. [2025-01-10 01:08:54,715 INFO L140 encePairwiseOnDemand]: 71/81 looper letters, 134 selfloop transitions, 12 changer transitions 0/166 dead transitions. [2025-01-10 01:08:54,715 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 89 places, 166 transitions, 853 flow [2025-01-10 01:08:54,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-01-10 01:08:54,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2025-01-10 01:08:54,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 336 transitions. [2025-01-10 01:08:54,717 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5185185185185185 [2025-01-10 01:08:54,717 INFO L175 Difference]: Start difference. First operand has 82 places, 75 transitions, 247 flow. Second operand 8 states and 336 transitions. [2025-01-10 01:08:54,717 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 89 places, 166 transitions, 853 flow [2025-01-10 01:08:54,739 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 87 places, 166 transitions, 828 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-01-10 01:08:54,740 INFO L231 Difference]: Finished difference. Result has 90 places, 79 transitions, 307 flow [2025-01-10 01:08:54,741 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=240, PETRI_DIFFERENCE_MINUEND_PLACES=80, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=75, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=307, PETRI_PLACES=90, PETRI_TRANSITIONS=79} [2025-01-10 01:08:54,741 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, 7 predicate places. [2025-01-10 01:08:54,742 INFO L471 AbstractCegarLoop]: Abstraction has has 90 places, 79 transitions, 307 flow [2025-01-10 01:08:54,743 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 29.857142857142858) internal successors, (418), 14 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:54,743 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:54,743 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:08:54,753 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2025-01-10 01:08:54,943 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2025-01-10 01:08:54,944 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:08:54,944 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:08:54,944 INFO L85 PathProgramCache]: Analyzing trace with hash -1330199345, now seen corresponding path program 1 times [2025-01-10 01:08:54,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:08:54,944 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856027838] [2025-01-10 01:08:54,944 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:54,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:08:54,949 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 20 statements into 1 equivalence classes. [2025-01-10 01:08:54,953 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 20 of 20 statements. [2025-01-10 01:08:54,954 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:54,954 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:55,019 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:55,021 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:08:55,021 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856027838] [2025-01-10 01:08:55,021 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856027838] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:08:55,021 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534123843] [2025-01-10 01:08:55,021 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-01-10 01:08:55,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:08:55,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:08:55,027 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:08:55,028 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2025-01-10 01:08:55,068 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 20 statements into 1 equivalence classes. [2025-01-10 01:08:55,078 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 20 of 20 statements. [2025-01-10 01:08:55,078 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-01-10 01:08:55,078 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:08:55,079 INFO L256 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-01-10 01:08:55,080 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:08:55,136 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:55,137 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-01-10 01:08:55,181 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:08:55,182 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534123843] provided 0 perfect and 2 imperfect interpolant sequences [2025-01-10 01:08:55,182 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-01-10 01:08:55,182 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2025-01-10 01:08:55,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654772151] [2025-01-10 01:08:55,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-01-10 01:08:55,182 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2025-01-10 01:08:55,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:08:55,182 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2025-01-10 01:08:55,182 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2025-01-10 01:08:55,237 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 81 [2025-01-10 01:08:55,237 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 90 places, 79 transitions, 307 flow. Second operand has 14 states, 14 states have (on average 28.428571428571427) internal successors, (398), 14 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:55,237 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:08:55,237 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 81 [2025-01-10 01:08:55,237 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:08:59,215 INFO L124 PetriNetUnfolderBase]: 50949/73543 cut-off events. [2025-01-10 01:08:59,215 INFO L125 PetriNetUnfolderBase]: For 58714/62283 co-relation queries the response was YES. [2025-01-10 01:08:59,534 INFO L83 FinitePrefix]: Finished finitePrefix Result has 180000 conditions, 73543 events. 50949/73543 cut-off events. For 58714/62283 co-relation queries the response was YES. Maximal size of possible extension queue 2431. Compared 540360 event pairs, 31419 based on Foata normal form. 3551/73666 useless extension candidates. Maximal degree in co-relation 179970. Up to 43909 conditions per place. [2025-01-10 01:08:59,907 INFO L140 encePairwiseOnDemand]: 71/81 looper letters, 132 selfloop transitions, 12 changer transitions 0/163 dead transitions. [2025-01-10 01:08:59,907 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 97 places, 163 transitions, 893 flow [2025-01-10 01:08:59,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-01-10 01:08:59,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2025-01-10 01:08:59,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 333 transitions. [2025-01-10 01:08:59,908 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5138888888888888 [2025-01-10 01:08:59,909 INFO L175 Difference]: Start difference. First operand has 90 places, 79 transitions, 307 flow. Second operand 8 states and 333 transitions. [2025-01-10 01:08:59,909 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 97 places, 163 transitions, 893 flow [2025-01-10 01:08:59,972 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 93 places, 163 transitions, 874 flow, removed 3 selfloop flow, removed 4 redundant places. [2025-01-10 01:08:59,974 INFO L231 Difference]: Finished difference. Result has 96 places, 83 transitions, 353 flow [2025-01-10 01:08:59,974 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=292, PETRI_DIFFERENCE_MINUEND_PLACES=86, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=79, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=353, PETRI_PLACES=96, PETRI_TRANSITIONS=83} [2025-01-10 01:08:59,975 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, 13 predicate places. [2025-01-10 01:08:59,975 INFO L471 AbstractCegarLoop]: Abstraction has has 96 places, 83 transitions, 353 flow [2025-01-10 01:08:59,975 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 28.428571428571427) internal successors, (398), 14 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:08:59,975 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:08:59,975 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:08:59,981 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2025-01-10 01:09:00,175 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:09:00,176 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:09:00,176 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:09:00,176 INFO L85 PathProgramCache]: Analyzing trace with hash 418690007, now seen corresponding path program 2 times [2025-01-10 01:09:00,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:09:00,176 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283045505] [2025-01-10 01:09:00,176 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-01-10 01:09:00,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:09:00,182 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 21 statements into 2 equivalence classes. [2025-01-10 01:09:00,204 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 21 of 21 statements. [2025-01-10 01:09:00,204 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-01-10 01:09:00,204 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:09:00,507 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-01-10 01:09:00,507 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:09:00,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283045505] [2025-01-10 01:09:00,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283045505] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:09:00,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340714160] [2025-01-10 01:09:00,507 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-01-10 01:09:00,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:09:00,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:09:00,509 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:09:00,511 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2025-01-10 01:09:00,552 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 21 statements into 2 equivalence classes. [2025-01-10 01:09:00,569 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 21 of 21 statements. [2025-01-10 01:09:00,569 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-01-10 01:09:00,570 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:09:00,570 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 17 conjuncts are in the unsatisfiable core [2025-01-10 01:09:00,572 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:09:00,690 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:09:00,691 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-01-10 01:09:00,789 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2025-01-10 01:09:00,829 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:09:00,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340714160] provided 0 perfect and 2 imperfect interpolant sequences [2025-01-10 01:09:00,829 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-01-10 01:09:00,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 20 [2025-01-10 01:09:00,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484145365] [2025-01-10 01:09:00,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-01-10 01:09:00,830 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2025-01-10 01:09:00,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:09:00,831 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2025-01-10 01:09:00,831 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2025-01-10 01:09:01,025 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 27 out of 81 [2025-01-10 01:09:01,025 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 96 places, 83 transitions, 353 flow. Second operand has 21 states, 21 states have (on average 29.80952380952381) internal successors, (626), 21 states have internal predecessors, (626), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:09:01,025 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:09:01,025 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 27 of 81 [2025-01-10 01:09:01,026 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-01-10 01:09:06,470 INFO L124 PetriNetUnfolderBase]: 55921/77113 cut-off events. [2025-01-10 01:09:06,470 INFO L125 PetriNetUnfolderBase]: For 69411/79992 co-relation queries the response was YES. [2025-01-10 01:09:06,895 INFO L83 FinitePrefix]: Finished finitePrefix Result has 203128 conditions, 77113 events. 55921/77113 cut-off events. For 69411/79992 co-relation queries the response was YES. Maximal size of possible extension queue 2797. Compared 545360 event pairs, 9613 based on Foata normal form. 9049/83953 useless extension candidates. Maximal degree in co-relation 203093. Up to 14635 conditions per place. [2025-01-10 01:09:07,236 INFO L140 encePairwiseOnDemand]: 67/81 looper letters, 247 selfloop transitions, 26 changer transitions 0/294 dead transitions. [2025-01-10 01:09:07,237 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 109 places, 294 transitions, 1638 flow [2025-01-10 01:09:07,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2025-01-10 01:09:07,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2025-01-10 01:09:07,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 629 transitions. [2025-01-10 01:09:07,239 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5176954732510288 [2025-01-10 01:09:07,239 INFO L175 Difference]: Start difference. First operand has 96 places, 83 transitions, 353 flow. Second operand 15 states and 629 transitions. [2025-01-10 01:09:07,239 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 109 places, 294 transitions, 1638 flow [2025-01-10 01:09:07,424 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 105 places, 294 transitions, 1617 flow, removed 4 selfloop flow, removed 4 redundant places. [2025-01-10 01:09:07,426 INFO L231 Difference]: Finished difference. Result has 107 places, 93 transitions, 464 flow [2025-01-10 01:09:07,426 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=81, PETRI_DIFFERENCE_MINUEND_FLOW=334, PETRI_DIFFERENCE_MINUEND_PLACES=91, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=82, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=15, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=464, PETRI_PLACES=107, PETRI_TRANSITIONS=93} [2025-01-10 01:09:07,427 INFO L279 CegarLoopForPetriNet]: 83 programPoint places, 24 predicate places. [2025-01-10 01:09:07,427 INFO L471 AbstractCegarLoop]: Abstraction has has 107 places, 93 transitions, 464 flow [2025-01-10 01:09:07,427 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 29.80952380952381) internal successors, (626), 21 states have internal predecessors, (626), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:09:07,427 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-01-10 01:09:07,427 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-01-10 01:09:07,434 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2025-01-10 01:09:07,628 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:09:07,628 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 33 more)] === [2025-01-10 01:09:07,629 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-01-10 01:09:07,629 INFO L85 PathProgramCache]: Analyzing trace with hash 1662083741, now seen corresponding path program 2 times [2025-01-10 01:09:07,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-01-10 01:09:07,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043653198] [2025-01-10 01:09:07,629 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-01-10 01:09:07,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-01-10 01:09:07,638 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 22 statements into 2 equivalence classes. [2025-01-10 01:09:07,650 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 22 of 22 statements. [2025-01-10 01:09:07,653 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-01-10 01:09:07,654 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:09:07,918 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-01-10 01:09:07,919 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-01-10 01:09:07,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043653198] [2025-01-10 01:09:07,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043653198] provided 0 perfect and 1 imperfect interpolant sequences [2025-01-10 01:09:07,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682803288] [2025-01-10 01:09:07,920 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-01-10 01:09:07,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-01-10 01:09:07,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2025-01-10 01:09:07,922 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-01-10 01:09:07,925 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2025-01-10 01:09:07,966 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 22 statements into 2 equivalence classes. [2025-01-10 01:09:07,982 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 22 of 22 statements. [2025-01-10 01:09:07,982 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-01-10 01:09:07,982 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-01-10 01:09:07,983 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 17 conjuncts are in the unsatisfiable core [2025-01-10 01:09:07,984 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-01-10 01:09:08,417 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:09:08,417 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-01-10 01:09:08,516 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2025-01-10 01:09:08,559 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-01-10 01:09:08,559 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682803288] provided 0 perfect and 2 imperfect interpolant sequences [2025-01-10 01:09:08,561 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-01-10 01:09:08,561 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 21 [2025-01-10 01:09:08,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437034686] [2025-01-10 01:09:08,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-01-10 01:09:08,561 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2025-01-10 01:09:08,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-01-10 01:09:08,562 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2025-01-10 01:09:08,562 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2025-01-10 01:09:08,767 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 81 [2025-01-10 01:09:08,768 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 107 places, 93 transitions, 464 flow. Second operand has 22 states, 22 states have (on average 28.136363636363637) internal successors, (619), 22 states have internal predecessors, (619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-01-10 01:09:08,768 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-01-10 01:09:08,768 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 81 [2025-01-10 01:09:08,768 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand