./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/weaver/popl20-more-vector-add.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 8fc3dc66 Calling Ultimate with: /root/.sdkman/candidates/java/21.0.5-tem/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/weaver/popl20-more-vector-add.wvr.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G 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 63e73d2abe89b782ca9e5c579baa72b5461ffc3c60c322f6f03d18cdd5548702 --- Real Ultimate output --- This is Ultimate 0.3.0-?-8fc3dc6-m [2025-03-17 14:30:30,455 INFO L188 SettingsManager]: Resetting all preferences to default values... [2025-03-17 14:30:30,507 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2025-03-17 14:30:30,514 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2025-03-17 14:30:30,514 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2025-03-17 14:30:30,533 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2025-03-17 14:30:30,534 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2025-03-17 14:30:30,534 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2025-03-17 14:30:30,534 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2025-03-17 14:30:30,534 INFO L153 SettingsManager]: * Use memory slicer=true [2025-03-17 14:30:30,535 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2025-03-17 14:30:30,535 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2025-03-17 14:30:30,536 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2025-03-17 14:30:30,536 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2025-03-17 14:30:30,536 INFO L153 SettingsManager]: * Use SBE=true [2025-03-17 14:30:30,536 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2025-03-17 14:30:30,536 INFO L153 SettingsManager]: * sizeof long=4 [2025-03-17 14:30:30,536 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * sizeof POINTER=4 [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * sizeof long double=12 [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2025-03-17 14:30:30,537 INFO L153 SettingsManager]: * Use constant arrays=true [2025-03-17 14:30:30,537 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 14:30:30,538 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2025-03-17 14:30:30,538 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2025-03-17 14:30:30,539 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2025-03-17 14:30:30,539 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2025-03-17 14:30:30,539 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/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 -> 63e73d2abe89b782ca9e5c579baa72b5461ffc3c60c322f6f03d18cdd5548702 [2025-03-17 14:30:30,758 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2025-03-17 14:30:30,766 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2025-03-17 14:30:30,768 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2025-03-17 14:30:30,770 INFO L270 PluginConnector]: Initializing CDTParser... [2025-03-17 14:30:30,770 INFO L274 PluginConnector]: CDTParser initialized [2025-03-17 14:30:30,771 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/weaver/popl20-more-vector-add.wvr.c [2025-03-17 14:30:31,956 INFO L533 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f59a96560/e6be351003b041a8ab4727c5d907bf6f/FLAG9ac9f4b89 [2025-03-17 14:30:32,168 INFO L384 CDTParser]: Found 1 translation units. [2025-03-17 14:30:32,169 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/weaver/popl20-more-vector-add.wvr.c [2025-03-17 14:30:32,179 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f59a96560/e6be351003b041a8ab4727c5d907bf6f/FLAG9ac9f4b89 [2025-03-17 14:30:32,193 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f59a96560/e6be351003b041a8ab4727c5d907bf6f [2025-03-17 14:30:32,195 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2025-03-17 14:30:32,196 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2025-03-17 14:30:32,198 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2025-03-17 14:30:32,198 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2025-03-17 14:30:32,201 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2025-03-17 14:30:32,202 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,204 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@203b3bd7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32, skipping insertion in model container [2025-03-17 14:30:32,204 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,218 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-03-17 14:30:32,355 WARN L1100 CHandler]: saw a pointer cast to a type that we could not get a type size for, not adapting memory model [2025-03-17 14:30:32,360 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 14:30:32,370 INFO L200 MainTranslator]: Completed pre-run [2025-03-17 14:30:32,394 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 14:30:32,410 INFO L204 MainTranslator]: Completed translation [2025-03-17 14:30:32,411 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32 WrapperNode [2025-03-17 14:30:32,411 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2025-03-17 14:30:32,412 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2025-03-17 14:30:32,412 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2025-03-17 14:30:32,413 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2025-03-17 14:30:32,417 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,424 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,443 INFO L138 Inliner]: procedures = 24, calls = 32, calls flagged for inlining = 12, calls inlined = 18, statements flattened = 175 [2025-03-17 14:30:32,447 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2025-03-17 14:30:32,448 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2025-03-17 14:30:32,448 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2025-03-17 14:30:32,448 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2025-03-17 14:30:32,456 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,456 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,459 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,473 INFO L175 MemorySlicer]: Split 17 memory accesses to 2 slices as follows [2, 15]. 88 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0]. The 7 writes are split as follows [0, 7]. [2025-03-17 14:30:32,474 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,474 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,479 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,480 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,481 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,482 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,483 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2025-03-17 14:30:32,484 INFO L112 PluginConnector]: ------------------------IcfgBuilder---------------------------- [2025-03-17 14:30:32,484 INFO L270 PluginConnector]: Initializing IcfgBuilder... [2025-03-17 14:30:32,484 INFO L274 PluginConnector]: IcfgBuilder initialized [2025-03-17 14:30:32,485 INFO L184 PluginConnector]: Executing the observer IcfgBuilderObserver from plugin IcfgBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (1/1) ... [2025-03-17 14:30:32,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 14:30:32,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:32,512 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2025-03-17 14:30:32,517 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2025-03-17 14:30:32,531 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2025-03-17 14:30:32,531 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2025-03-17 14:30:32,531 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2025-03-17 14:30:32,531 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2025-03-17 14:30:32,531 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2025-03-17 14:30:32,531 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2025-03-17 14:30:32,531 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2025-03-17 14:30:32,532 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2025-03-17 14:30:32,532 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2025-03-17 14:30:32,532 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2025-03-17 14:30:32,532 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2025-03-17 14:30:32,532 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2025-03-17 14:30:32,532 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2025-03-17 14:30:32,532 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2025-03-17 14:30:32,532 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2025-03-17 14:30:32,532 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2025-03-17 14:30:32,533 WARN L225 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement. [2025-03-17 14:30:32,616 INFO L256 CfgBuilder]: Building ICFG [2025-03-17 14:30:32,617 INFO L286 CfgBuilder]: Building CFG for each procedure with an implementation [2025-03-17 14:30:33,030 INFO L303 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2025-03-17 14:30:33,030 INFO L307 CfgBuilder]: Performing block encoding [2025-03-17 14:30:33,228 INFO L331 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2025-03-17 14:30:33,229 INFO L336 CfgBuilder]: Removed 0 assume(true) statements. [2025-03-17 14:30:33,230 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.03 02:30:33 BoogieIcfgContainer [2025-03-17 14:30:33,230 INFO L131 PluginConnector]: ------------------------ END IcfgBuilder---------------------------- [2025-03-17 14:30:33,232 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2025-03-17 14:30:33,232 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2025-03-17 14:30:33,236 INFO L274 PluginConnector]: TraceAbstraction initialized [2025-03-17 14:30:33,236 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.03 02:30:32" (1/3) ... [2025-03-17 14:30:33,237 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b19b524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 02:30:33, skipping insertion in model container [2025-03-17 14:30:33,238 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:30:32" (2/3) ... [2025-03-17 14:30:33,238 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b19b524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 02:30:33, skipping insertion in model container [2025-03-17 14:30:33,238 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.03 02:30:33" (3/3) ... [2025-03-17 14:30:33,239 INFO L128 eAbstractionObserver]: Analyzing ICFG popl20-more-vector-add.wvr.c [2025-03-17 14:30:33,250 INFO L216 ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2025-03-17 14:30:33,252 INFO L151 ceAbstractionStarter]: Applying trace abstraction to ICFG popl20-more-vector-add.wvr.c that has 4 procedures, 74 locations, 1 initial locations, 7 loop locations, and 32 error locations. [2025-03-17 14:30:33,252 INFO L491 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2025-03-17 14:30:33,332 INFO L143 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2025-03-17 14:30:33,356 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 83 places, 80 transitions, 181 flow [2025-03-17 14:30:33,384 INFO L124 PetriNetUnfolderBase]: 7/77 cut-off events. [2025-03-17 14:30:33,385 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2025-03-17 14:30:33,388 INFO L83 FinitePrefix]: Finished finitePrefix Result has 90 conditions, 77 events. 7/77 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 206 event pairs, 0 based on Foata normal form. 0/38 useless extension candidates. Maximal degree in co-relation 53. Up to 2 conditions per place. [2025-03-17 14:30:33,388 INFO L82 GeneralOperation]: Start removeDead. Operand has 83 places, 80 transitions, 181 flow [2025-03-17 14:30:33,394 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 79 places, 76 transitions, 170 flow [2025-03-17 14:30:33,399 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-03-17 14:30:33,408 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;@2b383474, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-03-17 14:30:33,409 INFO L334 AbstractCegarLoop]: Starting to check reachability of 53 error locations. [2025-03-17 14:30:33,413 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-03-17 14:30:33,414 INFO L124 PetriNetUnfolderBase]: 1/4 cut-off events. [2025-03-17 14:30:33,414 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2025-03-17 14:30:33,415 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:33,415 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2025-03-17 14:30:33,415 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:33,419 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:33,420 INFO L85 PathProgramCache]: Analyzing trace with hash 657428, now seen corresponding path program 1 times [2025-03-17 14:30:33,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:33,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64483887] [2025-03-17 14:30:33,428 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:33,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:33,478 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 3 statements into 1 equivalence classes. [2025-03-17 14:30:33,490 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 3 of 3 statements. [2025-03-17 14:30:33,490 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:33,490 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:33,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:33,599 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:33,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64483887] [2025-03-17 14:30:33,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64483887] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:33,600 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:33,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2025-03-17 14:30:33,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963992918] [2025-03-17 14:30:33,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:33,606 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2025-03-17 14:30:33,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:33,625 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2025-03-17 14:30:33,625 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2025-03-17 14:30:33,682 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 41 out of 80 [2025-03-17 14:30:33,685 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 76 transitions, 170 flow. Second operand has 3 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 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) [2025-03-17 14:30:33,685 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:33,686 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 41 of 80 [2025-03-17 14:30:33,686 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:33,853 INFO L124 PetriNetUnfolderBase]: 203/522 cut-off events. [2025-03-17 14:30:33,853 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2025-03-17 14:30:33,855 INFO L83 FinitePrefix]: Finished finitePrefix Result has 871 conditions, 522 events. 203/522 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 52. Compared 2855 event pairs, 124 based on Foata normal form. 1/379 useless extension candidates. Maximal degree in co-relation 741. Up to 294 conditions per place. [2025-03-17 14:30:33,861 INFO L140 encePairwiseOnDemand]: 73/80 looper letters, 31 selfloop transitions, 2 changer transitions 0/70 dead transitions. [2025-03-17 14:30:33,863 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 70 transitions, 224 flow [2025-03-17 14:30:33,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2025-03-17 14:30:33,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2025-03-17 14:30:33,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 161 transitions. [2025-03-17 14:30:33,874 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6708333333333333 [2025-03-17 14:30:33,876 INFO L175 Difference]: Start difference. First operand has 79 places, 76 transitions, 170 flow. Second operand 3 states and 161 transitions. [2025-03-17 14:30:33,876 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 70 transitions, 224 flow [2025-03-17 14:30:33,880 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 70 transitions, 212 flow, removed 0 selfloop flow, removed 6 redundant places. [2025-03-17 14:30:33,882 INFO L231 Difference]: Finished difference. Result has 69 places, 70 transitions, 150 flow [2025-03-17 14:30:33,883 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=146, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=68, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=150, PETRI_PLACES=69, PETRI_TRANSITIONS=70} [2025-03-17 14:30:33,887 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, -10 predicate places. [2025-03-17 14:30:33,887 INFO L471 AbstractCegarLoop]: Abstraction has has 69 places, 70 transitions, 150 flow [2025-03-17 14:30:33,887 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 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) [2025-03-17 14:30:33,887 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:33,887 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2025-03-17 14:30:33,888 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2025-03-17 14:30:33,888 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:33,888 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:33,888 INFO L85 PathProgramCache]: Analyzing trace with hash 657429, now seen corresponding path program 1 times [2025-03-17 14:30:33,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:33,888 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743368548] [2025-03-17 14:30:33,888 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:33,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:33,897 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 3 statements into 1 equivalence classes. [2025-03-17 14:30:33,914 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 3 of 3 statements. [2025-03-17 14:30:33,914 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:33,914 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:34,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:34,115 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:34,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743368548] [2025-03-17 14:30:34,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743368548] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:34,115 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:34,115 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-03-17 14:30:34,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67105873] [2025-03-17 14:30:34,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:34,116 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-17 14:30:34,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:34,117 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-17 14:30:34,117 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-17 14:30:34,227 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 41 out of 80 [2025-03-17 14:30:34,228 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 70 transitions, 150 flow. Second operand has 4 states, 4 states have (on average 41.75) internal successors, (167), 4 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) [2025-03-17 14:30:34,228 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:34,228 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 41 of 80 [2025-03-17 14:30:34,228 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:34,383 INFO L124 PetriNetUnfolderBase]: 204/525 cut-off events. [2025-03-17 14:30:34,384 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2025-03-17 14:30:34,385 INFO L83 FinitePrefix]: Finished finitePrefix Result has 855 conditions, 525 events. 204/525 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 52. Compared 2863 event pairs, 124 based on Foata normal form. 0/377 useless extension candidates. Maximal degree in co-relation 810. Up to 311 conditions per place. [2025-03-17 14:30:34,388 INFO L140 encePairwiseOnDemand]: 75/80 looper letters, 36 selfloop transitions, 4 changer transitions 0/73 dead transitions. [2025-03-17 14:30:34,388 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 73 transitions, 236 flow [2025-03-17 14:30:34,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-03-17 14:30:34,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-03-17 14:30:34,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 205 transitions. [2025-03-17 14:30:34,390 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.640625 [2025-03-17 14:30:34,390 INFO L175 Difference]: Start difference. First operand has 69 places, 70 transitions, 150 flow. Second operand 4 states and 205 transitions. [2025-03-17 14:30:34,390 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 73 transitions, 236 flow [2025-03-17 14:30:34,390 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 70 places, 73 transitions, 232 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-03-17 14:30:34,392 INFO L231 Difference]: Finished difference. Result has 72 places, 73 transitions, 173 flow [2025-03-17 14:30:34,392 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=146, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=66, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=173, PETRI_PLACES=72, PETRI_TRANSITIONS=73} [2025-03-17 14:30:34,393 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, -7 predicate places. [2025-03-17 14:30:34,393 INFO L471 AbstractCegarLoop]: Abstraction has has 72 places, 73 transitions, 173 flow [2025-03-17 14:30:34,393 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 41.75) internal successors, (167), 4 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) [2025-03-17 14:30:34,393 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:34,393 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2025-03-17 14:30:34,393 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2025-03-17 14:30:34,393 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:34,394 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:34,394 INFO L85 PathProgramCache]: Analyzing trace with hash 20382519, now seen corresponding path program 1 times [2025-03-17 14:30:34,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:34,394 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100545610] [2025-03-17 14:30:34,394 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:34,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:34,404 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 4 statements into 1 equivalence classes. [2025-03-17 14:30:34,420 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 4 of 4 statements. [2025-03-17 14:30:34,420 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:34,420 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:34,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:34,521 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:34,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100545610] [2025-03-17 14:30:34,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100545610] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:34,521 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:34,522 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 14:30:34,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682044152] [2025-03-17 14:30:34,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:34,522 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-17 14:30:34,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:34,522 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-17 14:30:34,523 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-17 14:30:34,533 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 45 out of 80 [2025-03-17 14:30:34,534 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 73 transitions, 173 flow. Second operand has 4 states, 4 states have (on average 45.75) internal successors, (183), 4 states have internal predecessors, (183), 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) [2025-03-17 14:30:34,534 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:34,534 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 45 of 80 [2025-03-17 14:30:34,534 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:34,654 INFO L124 PetriNetUnfolderBase]: 207/540 cut-off events. [2025-03-17 14:30:34,655 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2025-03-17 14:30:34,656 INFO L83 FinitePrefix]: Finished finitePrefix Result has 889 conditions, 540 events. 207/540 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 52. Compared 2971 event pairs, 124 based on Foata normal form. 0/393 useless extension candidates. Maximal degree in co-relation 823. Up to 308 conditions per place. [2025-03-17 14:30:34,658 INFO L140 encePairwiseOnDemand]: 68/80 looper letters, 35 selfloop transitions, 13 changer transitions 0/85 dead transitions. [2025-03-17 14:30:34,658 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 85 transitions, 293 flow [2025-03-17 14:30:34,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-03-17 14:30:34,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-03-17 14:30:34,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 231 transitions. [2025-03-17 14:30:34,660 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.721875 [2025-03-17 14:30:34,660 INFO L175 Difference]: Start difference. First operand has 72 places, 73 transitions, 173 flow. Second operand 4 states and 231 transitions. [2025-03-17 14:30:34,660 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 85 transitions, 293 flow [2025-03-17 14:30:34,661 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 85 transitions, 290 flow, removed 0 selfloop flow, removed 1 redundant places. [2025-03-17 14:30:34,661 INFO L231 Difference]: Finished difference. Result has 76 places, 82 transitions, 248 flow [2025-03-17 14:30:34,662 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=170, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=73, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=248, PETRI_PLACES=76, PETRI_TRANSITIONS=82} [2025-03-17 14:30:34,662 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, -3 predicate places. [2025-03-17 14:30:34,662 INFO L471 AbstractCegarLoop]: Abstraction has has 76 places, 82 transitions, 248 flow [2025-03-17 14:30:34,662 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 45.75) internal successors, (183), 4 states have internal predecessors, (183), 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) [2025-03-17 14:30:34,662 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:34,662 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1] [2025-03-17 14:30:34,662 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2025-03-17 14:30:34,663 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:34,663 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:34,663 INFO L85 PathProgramCache]: Analyzing trace with hash 631810516, now seen corresponding path program 1 times [2025-03-17 14:30:34,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:34,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91426605] [2025-03-17 14:30:34,663 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:34,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:34,668 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-03-17 14:30:34,681 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-03-17 14:30:34,681 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:34,682 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:34,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:34,885 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:34,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91426605] [2025-03-17 14:30:34,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91426605] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:34,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714994038] [2025-03-17 14:30:34,885 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:34,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:34,886 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:34,887 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:34,889 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2025-03-17 14:30:34,929 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-03-17 14:30:34,937 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-03-17 14:30:34,937 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:34,937 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:34,939 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 16 conjuncts are in the unsatisfiable core [2025-03-17 14:30:34,942 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:34,979 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 10 treesize of output 9 [2025-03-17 14:30:35,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:35,155 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:35,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:35,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714994038] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:30:35,251 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:30:35,251 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2025-03-17 14:30:35,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277282550] [2025-03-17 14:30:35,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:30:35,252 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2025-03-17 14:30:35,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:35,252 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2025-03-17 14:30:35,252 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2025-03-17 14:30:35,736 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 41 out of 80 [2025-03-17 14:30:35,736 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 82 transitions, 248 flow. Second operand has 11 states, 11 states have (on average 42.36363636363637) internal successors, (466), 11 states have internal predecessors, (466), 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) [2025-03-17 14:30:35,737 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:35,737 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 41 of 80 [2025-03-17 14:30:35,737 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:36,006 INFO L124 PetriNetUnfolderBase]: 208/542 cut-off events. [2025-03-17 14:30:36,006 INFO L125 PetriNetUnfolderBase]: For 9/9 co-relation queries the response was YES. [2025-03-17 14:30:36,007 INFO L83 FinitePrefix]: Finished finitePrefix Result has 937 conditions, 542 events. 208/542 cut-off events. For 9/9 co-relation queries the response was YES. Maximal size of possible extension queue 51. Compared 2973 event pairs, 124 based on Foata normal form. 0/402 useless extension candidates. Maximal degree in co-relation 829. Up to 323 conditions per place. [2025-03-17 14:30:36,012 INFO L140 encePairwiseOnDemand]: 75/80 looper letters, 41 selfloop transitions, 10 changer transitions 0/84 dead transitions. [2025-03-17 14:30:36,012 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 84 transitions, 361 flow [2025-03-17 14:30:36,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 14:30:36,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2025-03-17 14:30:36,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 372 transitions. [2025-03-17 14:30:36,016 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.58125 [2025-03-17 14:30:36,016 INFO L175 Difference]: Start difference. First operand has 76 places, 82 transitions, 248 flow. Second operand 8 states and 372 transitions. [2025-03-17 14:30:36,016 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 84 transitions, 361 flow [2025-03-17 14:30:36,017 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 84 transitions, 361 flow, removed 0 selfloop flow, removed 0 redundant places. [2025-03-17 14:30:36,019 INFO L231 Difference]: Finished difference. Result has 82 places, 84 transitions, 279 flow [2025-03-17 14:30:36,020 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=244, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=81, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=74, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=279, PETRI_PLACES=82, PETRI_TRANSITIONS=84} [2025-03-17 14:30:36,020 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 3 predicate places. [2025-03-17 14:30:36,021 INFO L471 AbstractCegarLoop]: Abstraction has has 82 places, 84 transitions, 279 flow [2025-03-17 14:30:36,021 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 42.36363636363637) internal successors, (466), 11 states have internal predecessors, (466), 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) [2025-03-17 14:30:36,022 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:36,022 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2025-03-17 14:30:36,030 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2025-03-17 14:30:36,226 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:36,226 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:36,227 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:36,227 INFO L85 PathProgramCache]: Analyzing trace with hash -1888708264, now seen corresponding path program 1 times [2025-03-17 14:30:36,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:36,227 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376773363] [2025-03-17 14:30:36,227 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:36,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:36,235 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 6 statements into 1 equivalence classes. [2025-03-17 14:30:36,246 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 6 of 6 statements. [2025-03-17 14:30:36,246 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:36,246 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:36,430 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:36,430 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:36,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376773363] [2025-03-17 14:30:36,430 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376773363] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:36,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648954695] [2025-03-17 14:30:36,432 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:36,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:36,432 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:36,434 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:36,437 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2025-03-17 14:30:36,478 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 6 statements into 1 equivalence classes. [2025-03-17 14:30:36,488 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 6 of 6 statements. [2025-03-17 14:30:36,488 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:36,488 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:36,492 INFO L256 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 21 conjuncts are in the unsatisfiable core [2025-03-17 14:30:36,493 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:36,506 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 [2025-03-17 14:30:36,593 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:30:36,593 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 27 [2025-03-17 14:30:36,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:36,612 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:36,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:36,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648954695] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:36,680 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:30:36,680 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 3] total 10 [2025-03-17 14:30:36,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546620982] [2025-03-17 14:30:36,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:36,681 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:30:36,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:36,681 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:30:36,681 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2025-03-17 14:30:36,801 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 41 out of 80 [2025-03-17 14:30:36,802 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 82 places, 84 transitions, 279 flow. Second operand has 5 states, 5 states have (on average 42.2) internal successors, (211), 5 states have internal predecessors, (211), 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) [2025-03-17 14:30:36,802 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:36,802 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 41 of 80 [2025-03-17 14:30:36,802 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:37,005 INFO L124 PetriNetUnfolderBase]: 406/1046 cut-off events. [2025-03-17 14:30:37,006 INFO L125 PetriNetUnfolderBase]: For 15/15 co-relation queries the response was YES. [2025-03-17 14:30:37,008 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1759 conditions, 1046 events. 406/1046 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 96. Compared 6892 event pairs, 248 based on Foata normal form. 3/778 useless extension candidates. Maximal degree in co-relation 892. Up to 312 conditions per place. [2025-03-17 14:30:37,013 INFO L140 encePairwiseOnDemand]: 68/80 looper letters, 64 selfloop transitions, 12 changer transitions 0/109 dead transitions. [2025-03-17 14:30:37,013 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 86 places, 109 transitions, 498 flow [2025-03-17 14:30:37,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 14:30:37,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-17 14:30:37,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 279 transitions. [2025-03-17 14:30:37,015 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6975 [2025-03-17 14:30:37,015 INFO L175 Difference]: Start difference. First operand has 82 places, 84 transitions, 279 flow. Second operand 5 states and 279 transitions. [2025-03-17 14:30:37,015 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 86 places, 109 transitions, 498 flow [2025-03-17 14:30:37,017 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 109 transitions, 456 flow, removed 6 selfloop flow, removed 7 redundant places. [2025-03-17 14:30:37,018 INFO L231 Difference]: Finished difference. Result has 80 places, 85 transitions, 281 flow [2025-03-17 14:30:37,018 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=237, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=84, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=11, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=73, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=281, PETRI_PLACES=80, PETRI_TRANSITIONS=85} [2025-03-17 14:30:37,020 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 1 predicate places. [2025-03-17 14:30:37,021 INFO L471 AbstractCegarLoop]: Abstraction has has 80 places, 85 transitions, 281 flow [2025-03-17 14:30:37,021 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 42.2) internal successors, (211), 5 states have internal predecessors, (211), 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) [2025-03-17 14:30:37,021 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:37,022 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:37,028 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:37,225 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:37,225 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:37,226 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:37,226 INFO L85 PathProgramCache]: Analyzing trace with hash 1722544394, now seen corresponding path program 1 times [2025-03-17 14:30:37,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:37,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898041788] [2025-03-17 14:30:37,226 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:37,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:37,239 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-03-17 14:30:37,245 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-03-17 14:30:37,245 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:37,245 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:37,339 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:37,339 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:37,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898041788] [2025-03-17 14:30:37,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898041788] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:37,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663096330] [2025-03-17 14:30:37,339 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:37,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:37,340 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:37,344 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:37,348 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2025-03-17 14:30:37,393 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-03-17 14:30:37,406 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-03-17 14:30:37,407 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:37,407 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:37,408 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 10 conjuncts are in the unsatisfiable core [2025-03-17 14:30:37,409 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:37,462 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:37,462 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:37,512 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:37,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663096330] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:30:37,512 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:30:37,513 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2025-03-17 14:30:37,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341991058] [2025-03-17 14:30:37,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:30:37,513 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2025-03-17 14:30:37,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:37,514 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2025-03-17 14:30:37,514 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2025-03-17 14:30:37,614 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 45 out of 80 [2025-03-17 14:30:37,615 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 80 places, 85 transitions, 281 flow. Second operand has 13 states, 13 states have (on average 46.53846153846154) internal successors, (605), 13 states have internal predecessors, (605), 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) [2025-03-17 14:30:37,615 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:37,615 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 45 of 80 [2025-03-17 14:30:37,615 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:37,949 INFO L124 PetriNetUnfolderBase]: 610/1575 cut-off events. [2025-03-17 14:30:37,949 INFO L125 PetriNetUnfolderBase]: For 37/37 co-relation queries the response was YES. [2025-03-17 14:30:37,952 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2651 conditions, 1575 events. 610/1575 cut-off events. For 37/37 co-relation queries the response was YES. Maximal size of possible extension queue 89. Compared 9780 event pairs, 372 based on Foata normal form. 3/1167 useless extension candidates. Maximal degree in co-relation 844. Up to 590 conditions per place. [2025-03-17 14:30:37,960 INFO L140 encePairwiseOnDemand]: 67/80 looper letters, 54 selfloop transitions, 39 changer transitions 0/129 dead transitions. [2025-03-17 14:30:37,960 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 88 places, 129 transitions, 645 flow [2025-03-17 14:30:37,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2025-03-17 14:30:37,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2025-03-17 14:30:37,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 500 transitions. [2025-03-17 14:30:37,963 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6944444444444444 [2025-03-17 14:30:37,963 INFO L175 Difference]: Start difference. First operand has 80 places, 85 transitions, 281 flow. Second operand 9 states and 500 transitions. [2025-03-17 14:30:37,963 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 88 places, 129 transitions, 645 flow [2025-03-17 14:30:37,964 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 87 places, 129 transitions, 643 flow, removed 0 selfloop flow, removed 1 redundant places. [2025-03-17 14:30:37,965 INFO L231 Difference]: Finished difference. Result has 89 places, 103 transitions, 501 flow [2025-03-17 14:30:37,966 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=279, PETRI_DIFFERENCE_MINUEND_PLACES=79, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=85, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=22, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=501, PETRI_PLACES=89, PETRI_TRANSITIONS=103} [2025-03-17 14:30:37,966 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 10 predicate places. [2025-03-17 14:30:37,966 INFO L471 AbstractCegarLoop]: Abstraction has has 89 places, 103 transitions, 501 flow [2025-03-17 14:30:37,967 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 46.53846153846154) internal successors, (605), 13 states have internal predecessors, (605), 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) [2025-03-17 14:30:37,967 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:37,967 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:37,973 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:38,171 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:38,171 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:38,172 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:38,172 INFO L85 PathProgramCache]: Analyzing trace with hash -881407904, now seen corresponding path program 1 times [2025-03-17 14:30:38,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:38,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964872350] [2025-03-17 14:30:38,172 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:38,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:38,177 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 9 statements into 1 equivalence classes. [2025-03-17 14:30:38,181 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 9 of 9 statements. [2025-03-17 14:30:38,182 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:38,182 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:38,257 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:38,257 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:38,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964872350] [2025-03-17 14:30:38,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964872350] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:38,258 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:38,258 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-03-17 14:30:38,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123458430] [2025-03-17 14:30:38,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:38,258 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:30:38,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:38,259 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:30:38,260 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:30:38,284 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:30:38,284 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 89 places, 103 transitions, 501 flow. Second operand has 5 states, 5 states have (on average 45.6) internal successors, (228), 5 states have internal predecessors, (228), 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) [2025-03-17 14:30:38,284 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:38,285 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:30:38,285 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:38,514 INFO L124 PetriNetUnfolderBase]: 874/2158 cut-off events. [2025-03-17 14:30:38,514 INFO L125 PetriNetUnfolderBase]: For 80/80 co-relation queries the response was YES. [2025-03-17 14:30:38,517 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3730 conditions, 2158 events. 874/2158 cut-off events. For 80/80 co-relation queries the response was YES. Maximal size of possible extension queue 79. Compared 13851 event pairs, 496 based on Foata normal form. 2/1590 useless extension candidates. Maximal degree in co-relation 1407. Up to 781 conditions per place. [2025-03-17 14:30:38,526 INFO L140 encePairwiseOnDemand]: 67/80 looper letters, 71 selfloop transitions, 27 changer transitions 1/134 dead transitions. [2025-03-17 14:30:38,526 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 94 places, 134 transitions, 787 flow [2025-03-17 14:30:38,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:30:38,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:30:38,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 343 transitions. [2025-03-17 14:30:38,529 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.7145833333333333 [2025-03-17 14:30:38,529 INFO L175 Difference]: Start difference. First operand has 89 places, 103 transitions, 501 flow. Second operand 6 states and 343 transitions. [2025-03-17 14:30:38,530 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 94 places, 134 transitions, 787 flow [2025-03-17 14:30:38,532 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 90 places, 134 transitions, 690 flow, removed 12 selfloop flow, removed 4 redundant places. [2025-03-17 14:30:38,535 INFO L231 Difference]: Finished difference. Result has 92 places, 105 transitions, 478 flow [2025-03-17 14:30:38,535 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=404, PETRI_DIFFERENCE_MINUEND_PLACES=85, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=103, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=25, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=76, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=478, PETRI_PLACES=92, PETRI_TRANSITIONS=105} [2025-03-17 14:30:38,536 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 13 predicate places. [2025-03-17 14:30:38,537 INFO L471 AbstractCegarLoop]: Abstraction has has 92 places, 105 transitions, 478 flow [2025-03-17 14:30:38,537 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 45.6) internal successors, (228), 5 states have internal predecessors, (228), 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) [2025-03-17 14:30:38,537 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:38,537 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1] [2025-03-17 14:30:38,537 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2025-03-17 14:30:38,537 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:38,538 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:38,538 INFO L85 PathProgramCache]: Analyzing trace with hash 368545451, now seen corresponding path program 2 times [2025-03-17 14:30:38,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:38,538 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445378245] [2025-03-17 14:30:38,538 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:30:38,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:38,547 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 10 statements into 2 equivalence classes. [2025-03-17 14:30:38,559 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 10 of 10 statements. [2025-03-17 14:30:38,559 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:30:38,559 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:38,713 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:30:38,713 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:38,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445378245] [2025-03-17 14:30:38,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445378245] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:38,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876636263] [2025-03-17 14:30:38,713 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:30:38,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:38,713 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:38,715 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:38,717 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2025-03-17 14:30:38,753 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 10 statements into 2 equivalence classes. [2025-03-17 14:30:38,765 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 10 of 10 statements. [2025-03-17 14:30:38,766 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:30:38,766 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:38,767 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 27 conjuncts are in the unsatisfiable core [2025-03-17 14:30:38,768 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:38,778 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 [2025-03-17 14:30:38,877 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:30:38,878 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 27 [2025-03-17 14:30:38,931 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2025-03-17 14:30:38,931 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:39,041 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2025-03-17 14:30:39,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876636263] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:30:39,041 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:30:39,041 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 14 [2025-03-17 14:30:39,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327369077] [2025-03-17 14:30:39,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:30:39,042 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2025-03-17 14:30:39,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:39,042 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2025-03-17 14:30:39,042 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2025-03-17 14:30:39,906 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 41 out of 80 [2025-03-17 14:30:39,907 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 105 transitions, 478 flow. Second operand has 16 states, 16 states have (on average 42.75) internal successors, (684), 16 states have internal predecessors, (684), 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) [2025-03-17 14:30:39,907 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:39,907 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 41 of 80 [2025-03-17 14:30:39,907 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:40,592 INFO L124 PetriNetUnfolderBase]: 1128/3208 cut-off events. [2025-03-17 14:30:40,593 INFO L125 PetriNetUnfolderBase]: For 604/604 co-relation queries the response was YES. [2025-03-17 14:30:40,598 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5744 conditions, 3208 events. 1128/3208 cut-off events. For 604/604 co-relation queries the response was YES. Maximal size of possible extension queue 142. Compared 25839 event pairs, 744 based on Foata normal form. 6/2297 useless extension candidates. Maximal degree in co-relation 2581. Up to 854 conditions per place. [2025-03-17 14:30:40,610 INFO L140 encePairwiseOnDemand]: 64/80 looper letters, 59 selfloop transitions, 46 changer transitions 0/138 dead transitions. [2025-03-17 14:30:40,611 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 99 places, 138 transitions, 855 flow [2025-03-17 14:30:40,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2025-03-17 14:30:40,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2025-03-17 14:30:40,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 546 transitions. [2025-03-17 14:30:40,612 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6204545454545455 [2025-03-17 14:30:40,612 INFO L175 Difference]: Start difference. First operand has 92 places, 105 transitions, 478 flow. Second operand 11 states and 546 transitions. [2025-03-17 14:30:40,612 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 99 places, 138 transitions, 855 flow [2025-03-17 14:30:40,618 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 95 places, 138 transitions, 777 flow, removed 0 selfloop flow, removed 4 redundant places. [2025-03-17 14:30:40,620 INFO L231 Difference]: Finished difference. Result has 96 places, 111 transitions, 579 flow [2025-03-17 14:30:40,620 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=403, PETRI_DIFFERENCE_MINUEND_PLACES=85, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=102, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=37, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=579, PETRI_PLACES=96, PETRI_TRANSITIONS=111} [2025-03-17 14:30:40,621 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 17 predicate places. [2025-03-17 14:30:40,622 INFO L471 AbstractCegarLoop]: Abstraction has has 96 places, 111 transitions, 579 flow [2025-03-17 14:30:40,623 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 42.75) internal successors, (684), 16 states have internal predecessors, (684), 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) [2025-03-17 14:30:40,623 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:40,623 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:40,630 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:40,824 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:40,824 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting thread2Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:40,824 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:40,824 INFO L85 PathProgramCache]: Analyzing trace with hash -983367067, now seen corresponding path program 1 times [2025-03-17 14:30:40,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:40,824 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086472944] [2025-03-17 14:30:40,824 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:40,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:40,829 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 11 statements into 1 equivalence classes. [2025-03-17 14:30:40,833 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 11 of 11 statements. [2025-03-17 14:30:40,833 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:40,833 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:40,899 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:40,900 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:40,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086472944] [2025-03-17 14:30:40,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1086472944] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:40,900 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:40,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2025-03-17 14:30:40,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120755613] [2025-03-17 14:30:40,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:40,900 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-03-17 14:30:40,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:40,900 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-03-17 14:30:40,900 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2025-03-17 14:30:40,935 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:30:40,936 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 96 places, 111 transitions, 579 flow. Second operand has 6 states, 6 states have (on average 45.666666666666664) internal successors, (274), 6 states have internal predecessors, (274), 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) [2025-03-17 14:30:40,936 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:40,936 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:30:40,936 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:41,201 INFO L124 PetriNetUnfolderBase]: 1236/3109 cut-off events. [2025-03-17 14:30:41,201 INFO L125 PetriNetUnfolderBase]: For 757/850 co-relation queries the response was YES. [2025-03-17 14:30:41,205 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5842 conditions, 3109 events. 1236/3109 cut-off events. For 757/850 co-relation queries the response was YES. Maximal size of possible extension queue 137. Compared 22543 event pairs, 744 based on Foata normal form. 0/2283 useless extension candidates. Maximal degree in co-relation 2563. Up to 1176 conditions per place. [2025-03-17 14:30:41,212 INFO L140 encePairwiseOnDemand]: 68/80 looper letters, 70 selfloop transitions, 32 changer transitions 3/137 dead transitions. [2025-03-17 14:30:41,213 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 101 places, 137 transitions, 881 flow [2025-03-17 14:30:41,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:30:41,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:30:41,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 339 transitions. [2025-03-17 14:30:41,214 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.70625 [2025-03-17 14:30:41,214 INFO L175 Difference]: Start difference. First operand has 96 places, 111 transitions, 579 flow. Second operand 6 states and 339 transitions. [2025-03-17 14:30:41,214 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 101 places, 137 transitions, 881 flow [2025-03-17 14:30:41,217 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 97 places, 137 transitions, 819 flow, removed 7 selfloop flow, removed 4 redundant places. [2025-03-17 14:30:41,219 INFO L231 Difference]: Finished difference. Result has 99 places, 113 transitions, 601 flow [2025-03-17 14:30:41,219 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=517, PETRI_DIFFERENCE_MINUEND_PLACES=92, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=111, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=30, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=79, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=601, PETRI_PLACES=99, PETRI_TRANSITIONS=113} [2025-03-17 14:30:41,220 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 20 predicate places. [2025-03-17 14:30:41,220 INFO L471 AbstractCegarLoop]: Abstraction has has 99 places, 113 transitions, 601 flow [2025-03-17 14:30:41,221 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 45.666666666666664) internal successors, (274), 6 states have internal predecessors, (274), 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) [2025-03-17 14:30:41,221 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:41,221 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:41,221 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2025-03-17 14:30:41,221 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting thread3Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:41,221 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:41,221 INFO L85 PathProgramCache]: Analyzing trace with hash -148865129, now seen corresponding path program 1 times [2025-03-17 14:30:41,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:41,222 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752486764] [2025-03-17 14:30:41,222 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:41,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:41,233 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 13 statements into 1 equivalence classes. [2025-03-17 14:30:41,239 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 13 of 13 statements. [2025-03-17 14:30:41,239 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:41,239 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:41,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 14:30:41,313 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:41,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752486764] [2025-03-17 14:30:41,314 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752486764] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:41,314 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:41,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2025-03-17 14:30:41,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502365605] [2025-03-17 14:30:41,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:41,314 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-03-17 14:30:41,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:41,314 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-03-17 14:30:41,314 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2025-03-17 14:30:41,349 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:30:41,350 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 99 places, 113 transitions, 601 flow. Second operand has 6 states, 6 states have (on average 46.0) internal successors, (276), 6 states have internal predecessors, (276), 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) [2025-03-17 14:30:41,350 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:41,350 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:30:41,350 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:41,615 INFO L124 PetriNetUnfolderBase]: 1014/2177 cut-off events. [2025-03-17 14:30:41,615 INFO L125 PetriNetUnfolderBase]: For 1113/1284 co-relation queries the response was YES. [2025-03-17 14:30:41,619 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4871 conditions, 2177 events. 1014/2177 cut-off events. For 1113/1284 co-relation queries the response was YES. Maximal size of possible extension queue 105. Compared 12868 event pairs, 659 based on Foata normal form. 0/1693 useless extension candidates. Maximal degree in co-relation 2501. Up to 1128 conditions per place. [2025-03-17 14:30:41,626 INFO L140 encePairwiseOnDemand]: 68/80 looper letters, 48 selfloop transitions, 19 changer transitions 35/134 dead transitions. [2025-03-17 14:30:41,626 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 104 places, 134 transitions, 895 flow [2025-03-17 14:30:41,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:30:41,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:30:41,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 336 transitions. [2025-03-17 14:30:41,628 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.7 [2025-03-17 14:30:41,628 INFO L175 Difference]: Start difference. First operand has 99 places, 113 transitions, 601 flow. Second operand 6 states and 336 transitions. [2025-03-17 14:30:41,628 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 104 places, 134 transitions, 895 flow [2025-03-17 14:30:41,634 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 101 places, 134 transitions, 841 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-03-17 14:30:41,635 INFO L231 Difference]: Finished difference. Result has 103 places, 96 transitions, 462 flow [2025-03-17 14:30:41,635 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=547, PETRI_DIFFERENCE_MINUEND_PLACES=96, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=113, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=19, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=94, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=462, PETRI_PLACES=103, PETRI_TRANSITIONS=96} [2025-03-17 14:30:41,637 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 24 predicate places. [2025-03-17 14:30:41,637 INFO L471 AbstractCegarLoop]: Abstraction has has 103 places, 96 transitions, 462 flow [2025-03-17 14:30:41,637 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 46.0) internal successors, (276), 6 states have internal predecessors, (276), 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) [2025-03-17 14:30:41,637 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:41,638 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:41,638 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2025-03-17 14:30:41,638 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:41,638 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:41,639 INFO L85 PathProgramCache]: Analyzing trace with hash 1208842295, now seen corresponding path program 1 times [2025-03-17 14:30:41,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:41,640 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670522595] [2025-03-17 14:30:41,640 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:41,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:41,647 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 17 statements into 1 equivalence classes. [2025-03-17 14:30:41,665 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 17 of 17 statements. [2025-03-17 14:30:41,666 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:41,666 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:41,826 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:30:41,827 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:41,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670522595] [2025-03-17 14:30:41,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670522595] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:41,827 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:41,827 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 14:30:41,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341109117] [2025-03-17 14:30:41,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:41,827 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:30:41,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:41,828 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:30:41,829 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:30:41,913 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 35 out of 80 [2025-03-17 14:30:41,913 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 103 places, 96 transitions, 462 flow. Second operand has 5 states, 5 states have (on average 38.2) internal successors, (191), 5 states have internal predecessors, (191), 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) [2025-03-17 14:30:41,913 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:41,914 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 35 of 80 [2025-03-17 14:30:41,914 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:42,144 INFO L124 PetriNetUnfolderBase]: 1293/2724 cut-off events. [2025-03-17 14:30:42,144 INFO L125 PetriNetUnfolderBase]: For 691/931 co-relation queries the response was YES. [2025-03-17 14:30:42,148 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5705 conditions, 2724 events. 1293/2724 cut-off events. For 691/931 co-relation queries the response was YES. Maximal size of possible extension queue 168. Compared 18706 event pairs, 918 based on Foata normal form. 0/2330 useless extension candidates. Maximal degree in co-relation 2837. Up to 1864 conditions per place. [2025-03-17 14:30:42,154 INFO L140 encePairwiseOnDemand]: 74/80 looper letters, 59 selfloop transitions, 7 changer transitions 0/93 dead transitions. [2025-03-17 14:30:42,154 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 96 places, 93 transitions, 588 flow [2025-03-17 14:30:42,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 14:30:42,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-17 14:30:42,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 214 transitions. [2025-03-17 14:30:42,156 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.535 [2025-03-17 14:30:42,156 INFO L175 Difference]: Start difference. First operand has 103 places, 96 transitions, 462 flow. Second operand 5 states and 214 transitions. [2025-03-17 14:30:42,156 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 96 places, 93 transitions, 588 flow [2025-03-17 14:30:42,162 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 85 places, 93 transitions, 499 flow, removed 16 selfloop flow, removed 11 redundant places. [2025-03-17 14:30:42,163 INFO L231 Difference]: Finished difference. Result has 85 places, 93 transitions, 381 flow [2025-03-17 14:30:42,163 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=367, PETRI_DIFFERENCE_MINUEND_PLACES=81, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=86, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=381, PETRI_PLACES=85, PETRI_TRANSITIONS=93} [2025-03-17 14:30:42,163 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 6 predicate places. [2025-03-17 14:30:42,164 INFO L471 AbstractCegarLoop]: Abstraction has has 85 places, 93 transitions, 381 flow [2025-03-17 14:30:42,164 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 38.2) internal successors, (191), 5 states have internal predecessors, (191), 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) [2025-03-17 14:30:42,164 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:42,164 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:42,164 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2025-03-17 14:30:42,164 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:42,164 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:42,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1208842296, now seen corresponding path program 1 times [2025-03-17 14:30:42,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:42,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044398806] [2025-03-17 14:30:42,165 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:42,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:42,171 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 17 statements into 1 equivalence classes. [2025-03-17 14:30:42,184 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 17 of 17 statements. [2025-03-17 14:30:42,184 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:42,184 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:42,433 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:30:42,433 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:42,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044398806] [2025-03-17 14:30:42,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044398806] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:42,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641044001] [2025-03-17 14:30:42,433 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:42,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:42,434 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:42,435 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:42,437 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2025-03-17 14:30:42,482 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 17 statements into 1 equivalence classes. [2025-03-17 14:30:42,502 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 17 of 17 statements. [2025-03-17 14:30:42,502 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:42,502 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:42,504 INFO L256 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 44 conjuncts are in the unsatisfiable core [2025-03-17 14:30:42,505 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:42,510 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 10 treesize of output 9 [2025-03-17 14:30:42,552 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:30:42,552 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 22 [2025-03-17 14:30:42,649 INFO L349 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2025-03-17 14:30:42,649 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 37 [2025-03-17 14:30:42,735 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:30:42,736 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 31 [2025-03-17 14:30:42,919 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:30:42,920 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:43,110 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:30:43,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641044001] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:43,111 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:30:43,111 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 15 [2025-03-17 14:30:43,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848537400] [2025-03-17 14:30:43,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:43,111 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:30:43,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:43,111 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:30:43,112 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2025-03-17 14:30:43,409 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 43 out of 80 [2025-03-17 14:30:43,410 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 85 places, 93 transitions, 381 flow. Second operand has 7 states, 7 states have (on average 45.285714285714285) internal successors, (317), 7 states have internal predecessors, (317), 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) [2025-03-17 14:30:43,410 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:43,410 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 43 of 80 [2025-03-17 14:30:43,410 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:43,788 INFO L124 PetriNetUnfolderBase]: 1212/2931 cut-off events. [2025-03-17 14:30:43,789 INFO L125 PetriNetUnfolderBase]: For 47/47 co-relation queries the response was YES. [2025-03-17 14:30:43,793 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4888 conditions, 2931 events. 1212/2931 cut-off events. For 47/47 co-relation queries the response was YES. Maximal size of possible extension queue 153. Compared 22107 event pairs, 507 based on Foata normal form. 0/2182 useless extension candidates. Maximal degree in co-relation 1615. Up to 1135 conditions per place. [2025-03-17 14:30:43,801 INFO L140 encePairwiseOnDemand]: 71/80 looper letters, 66 selfloop transitions, 13 changer transitions 0/107 dead transitions. [2025-03-17 14:30:43,801 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 91 places, 107 transitions, 575 flow [2025-03-17 14:30:43,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:30:43,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:30:43,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 352 transitions. [2025-03-17 14:30:43,803 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6285714285714286 [2025-03-17 14:30:43,803 INFO L175 Difference]: Start difference. First operand has 85 places, 93 transitions, 381 flow. Second operand 7 states and 352 transitions. [2025-03-17 14:30:43,803 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 91 places, 107 transitions, 575 flow [2025-03-17 14:30:43,804 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 88 places, 107 transitions, 565 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-03-17 14:30:43,805 INFO L231 Difference]: Finished difference. Result has 90 places, 95 transitions, 419 flow [2025-03-17 14:30:43,805 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=371, PETRI_DIFFERENCE_MINUEND_PLACES=82, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=11, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=80, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=419, PETRI_PLACES=90, PETRI_TRANSITIONS=95} [2025-03-17 14:30:43,806 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 11 predicate places. [2025-03-17 14:30:43,806 INFO L471 AbstractCegarLoop]: Abstraction has has 90 places, 95 transitions, 419 flow [2025-03-17 14:30:43,806 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 45.285714285714285) internal successors, (317), 7 states have internal predecessors, (317), 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) [2025-03-17 14:30:43,806 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:43,806 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:43,812 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:44,006 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2025-03-17 14:30:44,007 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:44,007 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:44,007 INFO L85 PathProgramCache]: Analyzing trace with hash -1180593899, now seen corresponding path program 1 times [2025-03-17 14:30:44,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:44,007 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362009445] [2025-03-17 14:30:44,007 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:44,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:44,013 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 18 statements into 1 equivalence classes. [2025-03-17 14:30:44,019 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 18 of 18 statements. [2025-03-17 14:30:44,019 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:44,019 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:44,098 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:30:44,098 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:44,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362009445] [2025-03-17 14:30:44,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362009445] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:44,098 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:44,098 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-03-17 14:30:44,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392223633] [2025-03-17 14:30:44,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:44,099 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:30:44,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:44,099 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:30:44,099 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:30:44,186 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 35 out of 80 [2025-03-17 14:30:44,187 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 90 places, 95 transitions, 419 flow. Second operand has 5 states, 5 states have (on average 38.2) internal successors, (191), 5 states have internal predecessors, (191), 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) [2025-03-17 14:30:44,187 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:44,187 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 35 of 80 [2025-03-17 14:30:44,187 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:44,407 INFO L124 PetriNetUnfolderBase]: 1713/3546 cut-off events. [2025-03-17 14:30:44,407 INFO L125 PetriNetUnfolderBase]: For 1297/1408 co-relation queries the response was YES. [2025-03-17 14:30:44,412 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7389 conditions, 3546 events. 1713/3546 cut-off events. For 1297/1408 co-relation queries the response was YES. Maximal size of possible extension queue 205. Compared 25582 event pairs, 1158 based on Foata normal form. 0/3214 useless extension candidates. Maximal degree in co-relation 2448. Up to 2404 conditions per place. [2025-03-17 14:30:44,420 INFO L140 encePairwiseOnDemand]: 74/80 looper letters, 59 selfloop transitions, 8 changer transitions 0/92 dead transitions. [2025-03-17 14:30:44,420 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 91 places, 92 transitions, 547 flow [2025-03-17 14:30:44,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 14:30:44,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-17 14:30:44,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 214 transitions. [2025-03-17 14:30:44,421 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.535 [2025-03-17 14:30:44,421 INFO L175 Difference]: Start difference. First operand has 90 places, 95 transitions, 419 flow. Second operand 5 states and 214 transitions. [2025-03-17 14:30:44,421 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 91 places, 92 transitions, 547 flow [2025-03-17 14:30:44,422 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 88 places, 92 transitions, 537 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-03-17 14:30:44,423 INFO L231 Difference]: Finished difference. Result has 88 places, 92 transitions, 419 flow [2025-03-17 14:30:44,423 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=403, PETRI_DIFFERENCE_MINUEND_PLACES=84, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=92, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=419, PETRI_PLACES=88, PETRI_TRANSITIONS=92} [2025-03-17 14:30:44,424 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 9 predicate places. [2025-03-17 14:30:44,424 INFO L471 AbstractCegarLoop]: Abstraction has has 88 places, 92 transitions, 419 flow [2025-03-17 14:30:44,424 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 38.2) internal successors, (191), 5 states have internal predecessors, (191), 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) [2025-03-17 14:30:44,424 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:44,424 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:44,424 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2025-03-17 14:30:44,424 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:44,425 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:44,425 INFO L85 PathProgramCache]: Analyzing trace with hash -1180593898, now seen corresponding path program 1 times [2025-03-17 14:30:44,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:44,425 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730047408] [2025-03-17 14:30:44,425 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:44,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:44,430 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 18 statements into 1 equivalence classes. [2025-03-17 14:30:44,437 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 18 of 18 statements. [2025-03-17 14:30:44,437 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:44,437 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:44,666 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:30:44,666 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:44,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730047408] [2025-03-17 14:30:44,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730047408] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:44,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484574801] [2025-03-17 14:30:44,666 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:44,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:44,666 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:44,670 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:44,671 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2025-03-17 14:30:44,716 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 18 statements into 1 equivalence classes. [2025-03-17 14:30:44,735 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 18 of 18 statements. [2025-03-17 14:30:44,735 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:44,735 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:44,742 INFO L256 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 39 conjuncts are in the unsatisfiable core [2025-03-17 14:30:44,744 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:44,749 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 10 treesize of output 9 [2025-03-17 14:30:44,793 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:30:44,793 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2025-03-17 14:30:44,849 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:30:44,850 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 31 [2025-03-17 14:30:44,983 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:44,984 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:45,120 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:45,121 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484574801] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:45,121 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:30:45,121 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 6] total 16 [2025-03-17 14:30:45,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19001529] [2025-03-17 14:30:45,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:45,121 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:30:45,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:45,121 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:30:45,121 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2025-03-17 14:30:45,444 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 43 out of 80 [2025-03-17 14:30:45,445 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 88 places, 92 transitions, 419 flow. Second operand has 7 states, 7 states have (on average 45.285714285714285) internal successors, (317), 7 states have internal predecessors, (317), 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) [2025-03-17 14:30:45,445 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:45,445 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 43 of 80 [2025-03-17 14:30:45,445 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:45,871 INFO L124 PetriNetUnfolderBase]: 1212/2703 cut-off events. [2025-03-17 14:30:45,871 INFO L125 PetriNetUnfolderBase]: For 439/565 co-relation queries the response was YES. [2025-03-17 14:30:45,875 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5315 conditions, 2703 events. 1212/2703 cut-off events. For 439/565 co-relation queries the response was YES. Maximal size of possible extension queue 134. Compared 18831 event pairs, 507 based on Foata normal form. 63/2272 useless extension candidates. Maximal degree in co-relation 1756. Up to 1135 conditions per place. [2025-03-17 14:30:45,882 INFO L140 encePairwiseOnDemand]: 71/80 looper letters, 65 selfloop transitions, 13 changer transitions 0/104 dead transitions. [2025-03-17 14:30:45,882 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 94 places, 104 transitions, 601 flow [2025-03-17 14:30:45,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:30:45,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:30:45,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 352 transitions. [2025-03-17 14:30:45,884 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6285714285714286 [2025-03-17 14:30:45,884 INFO L175 Difference]: Start difference. First operand has 88 places, 92 transitions, 419 flow. Second operand 7 states and 352 transitions. [2025-03-17 14:30:45,884 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 94 places, 104 transitions, 601 flow [2025-03-17 14:30:45,885 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 91 places, 104 transitions, 589 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-03-17 14:30:45,886 INFO L231 Difference]: Finished difference. Result has 93 places, 93 transitions, 451 flow [2025-03-17 14:30:45,887 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=407, PETRI_DIFFERENCE_MINUEND_PLACES=85, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=92, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=79, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=451, PETRI_PLACES=93, PETRI_TRANSITIONS=93} [2025-03-17 14:30:45,888 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 14 predicate places. [2025-03-17 14:30:45,888 INFO L471 AbstractCegarLoop]: Abstraction has has 93 places, 93 transitions, 451 flow [2025-03-17 14:30:45,888 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 45.285714285714285) internal successors, (317), 7 states have internal predecessors, (317), 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) [2025-03-17 14:30:45,888 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:45,888 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:45,894 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:46,088 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:46,089 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting thread2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:46,089 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:46,089 INFO L85 PathProgramCache]: Analyzing trace with hash 1997347902, now seen corresponding path program 1 times [2025-03-17 14:30:46,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:46,089 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554162023] [2025-03-17 14:30:46,089 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:46,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:46,095 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-03-17 14:30:46,101 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-03-17 14:30:46,101 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:46,101 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:46,336 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:30:46,336 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:46,336 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554162023] [2025-03-17 14:30:46,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1554162023] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:46,337 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776467010] [2025-03-17 14:30:46,337 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:46,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:46,337 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:46,339 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:46,341 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2025-03-17 14:30:46,386 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-03-17 14:30:46,406 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-03-17 14:30:46,406 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:46,406 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:46,413 INFO L256 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 44 conjuncts are in the unsatisfiable core [2025-03-17 14:30:46,415 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:46,418 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 10 treesize of output 9 [2025-03-17 14:30:46,453 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:30:46,454 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 22 [2025-03-17 14:30:46,541 INFO L349 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2025-03-17 14:30:46,541 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 37 [2025-03-17 14:30:46,609 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:30:46,609 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 31 [2025-03-17 14:30:46,768 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:30:46,768 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:46,948 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:30:46,948 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776467010] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:46,948 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:30:46,948 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 15 [2025-03-17 14:30:46,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320259137] [2025-03-17 14:30:46,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:46,949 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:30:46,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:46,949 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:30:46,949 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2025-03-17 14:30:47,236 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 43 out of 80 [2025-03-17 14:30:47,237 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 93 places, 93 transitions, 451 flow. Second operand has 7 states, 7 states have (on average 45.57142857142857) internal successors, (319), 7 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 14:30:47,237 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:47,237 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 43 of 80 [2025-03-17 14:30:47,237 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:47,621 INFO L124 PetriNetUnfolderBase]: 1626/3594 cut-off events. [2025-03-17 14:30:47,621 INFO L125 PetriNetUnfolderBase]: For 5596/6283 co-relation queries the response was YES. [2025-03-17 14:30:47,628 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8127 conditions, 3594 events. 1626/3594 cut-off events. For 5596/6283 co-relation queries the response was YES. Maximal size of possible extension queue 194. Compared 27650 event pairs, 702 based on Foata normal form. 0/2914 useless extension candidates. Maximal degree in co-relation 2693. Up to 1486 conditions per place. [2025-03-17 14:30:47,643 INFO L140 encePairwiseOnDemand]: 71/80 looper letters, 67 selfloop transitions, 13 changer transitions 0/107 dead transitions. [2025-03-17 14:30:47,643 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 99 places, 107 transitions, 673 flow [2025-03-17 14:30:47,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:30:47,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:30:47,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 351 transitions. [2025-03-17 14:30:47,645 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6267857142857143 [2025-03-17 14:30:47,645 INFO L175 Difference]: Start difference. First operand has 93 places, 93 transitions, 451 flow. Second operand 7 states and 351 transitions. [2025-03-17 14:30:47,645 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 99 places, 107 transitions, 673 flow [2025-03-17 14:30:47,647 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 94 places, 107 transitions, 652 flow, removed 0 selfloop flow, removed 5 redundant places. [2025-03-17 14:30:47,678 INFO L231 Difference]: Finished difference. Result has 96 places, 95 transitions, 481 flow [2025-03-17 14:30:47,678 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=433, PETRI_DIFFERENCE_MINUEND_PLACES=88, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=11, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=80, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=481, PETRI_PLACES=96, PETRI_TRANSITIONS=95} [2025-03-17 14:30:47,679 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 17 predicate places. [2025-03-17 14:30:47,679 INFO L471 AbstractCegarLoop]: Abstraction has has 96 places, 95 transitions, 481 flow [2025-03-17 14:30:47,679 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 45.57142857142857) internal successors, (319), 7 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 14:30:47,679 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:47,679 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:47,687 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:47,879 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:47,880 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:47,880 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:47,880 INFO L85 PathProgramCache]: Analyzing trace with hash 2056295417, now seen corresponding path program 1 times [2025-03-17 14:30:47,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:47,880 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469463931] [2025-03-17 14:30:47,880 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:47,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:47,888 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-03-17 14:30:47,895 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-03-17 14:30:47,895 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:47,895 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:47,953 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:47,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:47,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469463931] [2025-03-17 14:30:47,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469463931] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:47,953 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:47,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-03-17 14:30:47,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859305277] [2025-03-17 14:30:47,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:47,954 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:30:47,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:47,955 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:30:47,955 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:30:48,007 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 38 out of 80 [2025-03-17 14:30:48,007 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 96 places, 95 transitions, 481 flow. Second operand has 5 states, 5 states have (on average 41.2) internal successors, (206), 5 states have internal predecessors, (206), 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) [2025-03-17 14:30:48,007 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:48,007 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 38 of 80 [2025-03-17 14:30:48,007 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:48,162 INFO L124 PetriNetUnfolderBase]: 1041/2352 cut-off events. [2025-03-17 14:30:48,162 INFO L125 PetriNetUnfolderBase]: For 4155/4785 co-relation queries the response was YES. [2025-03-17 14:30:48,167 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6117 conditions, 2352 events. 1041/2352 cut-off events. For 4155/4785 co-relation queries the response was YES. Maximal size of possible extension queue 158. Compared 16856 event pairs, 702 based on Foata normal form. 90/2050 useless extension candidates. Maximal degree in co-relation 2022. Up to 1489 conditions per place. [2025-03-17 14:30:48,174 INFO L140 encePairwiseOnDemand]: 75/80 looper letters, 57 selfloop transitions, 9 changer transitions 0/93 dead transitions. [2025-03-17 14:30:48,175 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 98 places, 93 transitions, 609 flow [2025-03-17 14:30:48,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 14:30:48,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-17 14:30:48,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 226 transitions. [2025-03-17 14:30:48,176 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.565 [2025-03-17 14:30:48,176 INFO L175 Difference]: Start difference. First operand has 96 places, 95 transitions, 481 flow. Second operand 5 states and 226 transitions. [2025-03-17 14:30:48,176 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 98 places, 93 transitions, 609 flow [2025-03-17 14:30:48,178 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 94 places, 93 transitions, 595 flow, removed 0 selfloop flow, removed 4 redundant places. [2025-03-17 14:30:48,179 INFO L231 Difference]: Finished difference. Result has 94 places, 93 transitions, 481 flow [2025-03-17 14:30:48,179 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=463, PETRI_DIFFERENCE_MINUEND_PLACES=90, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=481, PETRI_PLACES=94, PETRI_TRANSITIONS=93} [2025-03-17 14:30:48,180 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 15 predicate places. [2025-03-17 14:30:48,180 INFO L471 AbstractCegarLoop]: Abstraction has has 94 places, 93 transitions, 481 flow [2025-03-17 14:30:48,180 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 41.2) internal successors, (206), 5 states have internal predecessors, (206), 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) [2025-03-17 14:30:48,180 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:48,180 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:48,180 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2025-03-17 14:30:48,180 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:48,181 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:48,181 INFO L85 PathProgramCache]: Analyzing trace with hash 2056295418, now seen corresponding path program 1 times [2025-03-17 14:30:48,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:48,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107002629] [2025-03-17 14:30:48,181 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:48,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:48,186 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-03-17 14:30:48,191 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-03-17 14:30:48,191 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:48,191 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:48,314 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:48,314 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:48,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107002629] [2025-03-17 14:30:48,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107002629] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:48,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20793266] [2025-03-17 14:30:48,315 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:48,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:48,315 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:48,317 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:48,318 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2025-03-17 14:30:48,362 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-03-17 14:30:48,381 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-03-17 14:30:48,382 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:48,382 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:48,383 INFO L256 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 41 conjuncts are in the unsatisfiable core [2025-03-17 14:30:48,384 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:48,389 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 10 treesize of output 9 [2025-03-17 14:30:48,432 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:30:48,433 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2025-03-17 14:30:48,498 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:30:48,499 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 31 [2025-03-17 14:30:48,637 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:48,637 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:48,748 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:48,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20793266] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:48,748 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:30:48,748 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 6] total 15 [2025-03-17 14:30:48,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302720789] [2025-03-17 14:30:48,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:48,749 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:30:48,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:48,749 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:30:48,749 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2025-03-17 14:30:48,958 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:30:48,959 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 94 places, 93 transitions, 481 flow. Second operand has 7 states, 7 states have (on average 46.285714285714285) internal successors, (324), 7 states have internal predecessors, (324), 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) [2025-03-17 14:30:48,959 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:48,959 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:30:48,959 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:49,210 INFO L124 PetriNetUnfolderBase]: 1374/3084 cut-off events. [2025-03-17 14:30:49,210 INFO L125 PetriNetUnfolderBase]: For 3588/4002 co-relation queries the response was YES. [2025-03-17 14:30:49,216 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8077 conditions, 3084 events. 1374/3084 cut-off events. For 3588/4002 co-relation queries the response was YES. Maximal size of possible extension queue 166. Compared 22817 event pairs, 702 based on Foata normal form. 189/2860 useless extension candidates. Maximal degree in co-relation 2674. Up to 1588 conditions per place. [2025-03-17 14:30:49,226 INFO L140 encePairwiseOnDemand]: 71/80 looper letters, 64 selfloop transitions, 15 changer transitions 0/106 dead transitions. [2025-03-17 14:30:49,226 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 101 places, 106 transitions, 688 flow [2025-03-17 14:30:49,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 14:30:49,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2025-03-17 14:30:49,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 402 transitions. [2025-03-17 14:30:49,227 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.628125 [2025-03-17 14:30:49,227 INFO L175 Difference]: Start difference. First operand has 94 places, 93 transitions, 481 flow. Second operand 8 states and 402 transitions. [2025-03-17 14:30:49,227 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 101 places, 106 transitions, 688 flow [2025-03-17 14:30:49,231 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 98 places, 106 transitions, 674 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-03-17 14:30:49,232 INFO L231 Difference]: Finished difference. Result has 99 places, 94 transitions, 513 flow [2025-03-17 14:30:49,232 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=467, PETRI_DIFFERENCE_MINUEND_PLACES=91, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=14, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=78, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=513, PETRI_PLACES=99, PETRI_TRANSITIONS=94} [2025-03-17 14:30:49,232 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 20 predicate places. [2025-03-17 14:30:49,232 INFO L471 AbstractCegarLoop]: Abstraction has has 99 places, 94 transitions, 513 flow [2025-03-17 14:30:49,232 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 46.285714285714285) internal successors, (324), 7 states have internal predecessors, (324), 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) [2025-03-17 14:30:49,232 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:49,232 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:49,240 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:49,437 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2025-03-17 14:30:49,437 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:49,437 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:49,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1788243420, now seen corresponding path program 1 times [2025-03-17 14:30:49,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:49,437 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707633391] [2025-03-17 14:30:49,437 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:49,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:49,445 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 20 statements into 1 equivalence classes. [2025-03-17 14:30:49,452 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 20 of 20 statements. [2025-03-17 14:30:49,452 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:49,452 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:49,659 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:30:49,659 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:49,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707633391] [2025-03-17 14:30:49,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707633391] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:49,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588139833] [2025-03-17 14:30:49,659 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:49,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:49,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:49,661 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:49,662 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2025-03-17 14:30:49,707 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 20 statements into 1 equivalence classes. [2025-03-17 14:30:49,727 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 20 of 20 statements. [2025-03-17 14:30:49,727 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:49,727 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:49,728 INFO L256 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 39 conjuncts are in the unsatisfiable core [2025-03-17 14:30:49,730 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:49,734 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 10 treesize of output 9 [2025-03-17 14:30:49,773 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:30:49,773 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2025-03-17 14:30:49,829 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:30:49,830 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 28 [2025-03-17 14:30:49,985 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:49,985 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:50,143 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:50,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588139833] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:50,143 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:30:50,143 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 6] total 16 [2025-03-17 14:30:50,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202408995] [2025-03-17 14:30:50,143 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:50,143 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:30:50,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:50,143 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:30:50,144 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2025-03-17 14:30:50,571 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 43 out of 80 [2025-03-17 14:30:50,571 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 99 places, 94 transitions, 513 flow. Second operand has 7 states, 7 states have (on average 45.57142857142857) internal successors, (319), 7 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 14:30:50,571 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:50,571 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 43 of 80 [2025-03-17 14:30:50,571 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:50,998 INFO L124 PetriNetUnfolderBase]: 1773/3684 cut-off events. [2025-03-17 14:30:50,999 INFO L125 PetriNetUnfolderBase]: For 10261/11161 co-relation queries the response was YES. [2025-03-17 14:30:51,003 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10635 conditions, 3684 events. 1773/3684 cut-off events. For 10261/11161 co-relation queries the response was YES. Maximal size of possible extension queue 193. Compared 26924 event pairs, 702 based on Foata normal form. 69/3176 useless extension candidates. Maximal degree in co-relation 3527. Up to 1588 conditions per place. [2025-03-17 14:30:51,013 INFO L140 encePairwiseOnDemand]: 71/80 looper letters, 68 selfloop transitions, 13 changer transitions 0/107 dead transitions. [2025-03-17 14:30:51,014 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 105 places, 107 transitions, 744 flow [2025-03-17 14:30:51,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:30:51,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:30:51,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 351 transitions. [2025-03-17 14:30:51,015 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6267857142857143 [2025-03-17 14:30:51,015 INFO L175 Difference]: Start difference. First operand has 99 places, 94 transitions, 513 flow. Second operand 7 states and 351 transitions. [2025-03-17 14:30:51,015 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 105 places, 107 transitions, 744 flow [2025-03-17 14:30:51,018 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 98 places, 107 transitions, 705 flow, removed 0 selfloop flow, removed 7 redundant places. [2025-03-17 14:30:51,019 INFO L231 Difference]: Finished difference. Result has 100 places, 95 transitions, 525 flow [2025-03-17 14:30:51,019 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=481, PETRI_DIFFERENCE_MINUEND_PLACES=92, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=94, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=81, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=525, PETRI_PLACES=100, PETRI_TRANSITIONS=95} [2025-03-17 14:30:51,019 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 21 predicate places. [2025-03-17 14:30:51,019 INFO L471 AbstractCegarLoop]: Abstraction has has 100 places, 95 transitions, 525 flow [2025-03-17 14:30:51,019 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 45.57142857142857) internal successors, (319), 7 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 14:30:51,020 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:51,020 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:51,026 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:51,221 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2025-03-17 14:30:51,221 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:51,222 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:51,223 INFO L85 PathProgramCache]: Analyzing trace with hash -399028224, now seen corresponding path program 1 times [2025-03-17 14:30:51,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:51,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468826468] [2025-03-17 14:30:51,223 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:51,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:51,230 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 14:30:51,234 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 14:30:51,235 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:51,235 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:51,321 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:51,321 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:51,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468826468] [2025-03-17 14:30:51,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468826468] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:51,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49682505] [2025-03-17 14:30:51,322 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:51,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:51,322 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:51,323 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:51,325 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2025-03-17 14:30:51,372 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 14:30:51,391 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 14:30:51,391 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:51,392 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:51,393 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 34 conjuncts are in the unsatisfiable core [2025-03-17 14:30:51,395 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:51,403 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 [2025-03-17 14:30:51,419 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 15 treesize of output 11 [2025-03-17 14:30:51,434 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 [2025-03-17 14:30:51,463 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:51,463 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:51,544 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:51,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49682505] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:51,544 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:30:51,544 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 6] total 11 [2025-03-17 14:30:51,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916318193] [2025-03-17 14:30:51,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:51,544 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:30:51,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:51,545 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:30:51,545 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2025-03-17 14:30:51,722 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:30:51,722 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 100 places, 95 transitions, 525 flow. Second operand has 7 states, 7 states have (on average 46.57142857142857) internal successors, (326), 7 states have internal predecessors, (326), 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) [2025-03-17 14:30:51,722 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:51,722 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:30:51,722 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:51,962 INFO L124 PetriNetUnfolderBase]: 1503/3417 cut-off events. [2025-03-17 14:30:51,962 INFO L125 PetriNetUnfolderBase]: For 7346/8027 co-relation queries the response was YES. [2025-03-17 14:30:51,969 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10331 conditions, 3417 events. 1503/3417 cut-off events. For 7346/8027 co-relation queries the response was YES. Maximal size of possible extension queue 180. Compared 26191 event pairs, 702 based on Foata normal form. 123/3070 useless extension candidates. Maximal degree in co-relation 3425. Up to 1693 conditions per place. [2025-03-17 14:30:51,979 INFO L140 encePairwiseOnDemand]: 72/80 looper letters, 69 selfloop transitions, 11 changer transitions 0/108 dead transitions. [2025-03-17 14:30:51,980 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 106 places, 108 transitions, 755 flow [2025-03-17 14:30:51,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:30:51,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:30:51,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 357 transitions. [2025-03-17 14:30:51,981 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6375 [2025-03-17 14:30:51,981 INFO L175 Difference]: Start difference. First operand has 100 places, 95 transitions, 525 flow. Second operand 7 states and 357 transitions. [2025-03-17 14:30:51,981 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 106 places, 108 transitions, 755 flow [2025-03-17 14:30:51,984 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 101 places, 108 transitions, 736 flow, removed 0 selfloop flow, removed 5 redundant places. [2025-03-17 14:30:51,985 INFO L231 Difference]: Finished difference. Result has 102 places, 96 transitions, 545 flow [2025-03-17 14:30:51,986 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=507, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=545, PETRI_PLACES=102, PETRI_TRANSITIONS=96} [2025-03-17 14:30:51,986 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 23 predicate places. [2025-03-17 14:30:51,986 INFO L471 AbstractCegarLoop]: Abstraction has has 102 places, 96 transitions, 545 flow [2025-03-17 14:30:51,986 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 46.57142857142857) internal successors, (326), 7 states have internal predecessors, (326), 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) [2025-03-17 14:30:51,986 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:51,986 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:51,992 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2025-03-17 14:30:52,186 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:52,187 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting thread3Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:52,187 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:52,187 INFO L85 PathProgramCache]: Analyzing trace with hash -424967312, now seen corresponding path program 1 times [2025-03-17 14:30:52,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:52,187 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152162728] [2025-03-17 14:30:52,187 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:52,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:52,193 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 14:30:52,201 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 14:30:52,201 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:52,201 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:52,414 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:30:52,415 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:52,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152162728] [2025-03-17 14:30:52,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152162728] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:52,415 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:52,415 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2025-03-17 14:30:52,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932055124] [2025-03-17 14:30:52,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:52,416 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2025-03-17 14:30:52,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:52,417 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2025-03-17 14:30:52,417 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2025-03-17 14:30:52,823 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 33 out of 80 [2025-03-17 14:30:52,823 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 102 places, 96 transitions, 545 flow. Second operand has 10 states, 10 states have (on average 35.1) internal successors, (351), 10 states have internal predecessors, (351), 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) [2025-03-17 14:30:52,823 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:52,823 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 33 of 80 [2025-03-17 14:30:52,823 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:53,300 INFO L124 PetriNetUnfolderBase]: 3825/6642 cut-off events. [2025-03-17 14:30:53,300 INFO L125 PetriNetUnfolderBase]: For 21328/22762 co-relation queries the response was YES. [2025-03-17 14:30:53,310 INFO L83 FinitePrefix]: Finished finitePrefix Result has 22692 conditions, 6642 events. 3825/6642 cut-off events. For 21328/22762 co-relation queries the response was YES. Maximal size of possible extension queue 298. Compared 45244 event pairs, 1164 based on Foata normal form. 0/5839 useless extension candidates. Maximal degree in co-relation 7545. Up to 2359 conditions per place. [2025-03-17 14:30:53,330 INFO L140 encePairwiseOnDemand]: 72/80 looper letters, 96 selfloop transitions, 11 changer transitions 0/129 dead transitions. [2025-03-17 14:30:53,330 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 107 places, 129 transitions, 999 flow [2025-03-17 14:30:53,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:30:53,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:30:53,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 291 transitions. [2025-03-17 14:30:53,331 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5196428571428572 [2025-03-17 14:30:53,331 INFO L175 Difference]: Start difference. First operand has 102 places, 96 transitions, 545 flow. Second operand 7 states and 291 transitions. [2025-03-17 14:30:53,331 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 107 places, 129 transitions, 999 flow [2025-03-17 14:30:53,336 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 101 places, 129 transitions, 961 flow, removed 0 selfloop flow, removed 6 redundant places. [2025-03-17 14:30:53,337 INFO L231 Difference]: Finished difference. Result has 101 places, 95 transitions, 541 flow [2025-03-17 14:30:53,337 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=519, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=11, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=541, PETRI_PLACES=101, PETRI_TRANSITIONS=95} [2025-03-17 14:30:53,338 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 22 predicate places. [2025-03-17 14:30:53,338 INFO L471 AbstractCegarLoop]: Abstraction has has 101 places, 95 transitions, 541 flow [2025-03-17 14:30:53,339 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 35.1) internal successors, (351), 10 states have internal predecessors, (351), 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) [2025-03-17 14:30:53,339 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:53,339 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:53,339 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2025-03-17 14:30:53,339 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting thread2Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:53,339 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:53,339 INFO L85 PathProgramCache]: Analyzing trace with hash -399028225, now seen corresponding path program 1 times [2025-03-17 14:30:53,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:53,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494926289] [2025-03-17 14:30:53,340 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:53,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:53,346 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 14:30:53,349 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 14:30:53,350 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:53,350 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:53,376 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:30:53,376 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:53,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494926289] [2025-03-17 14:30:53,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494926289] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:30:53,376 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:30:53,376 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 14:30:53,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794210428] [2025-03-17 14:30:53,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:30:53,377 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-17 14:30:53,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:53,377 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-17 14:30:53,377 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-17 14:30:53,430 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 38 out of 80 [2025-03-17 14:30:53,431 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 101 places, 95 transitions, 541 flow. Second operand has 4 states, 4 states have (on average 42.5) internal successors, (170), 4 states have internal predecessors, (170), 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) [2025-03-17 14:30:53,431 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:53,431 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 38 of 80 [2025-03-17 14:30:53,431 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:53,605 INFO L124 PetriNetUnfolderBase]: 1233/2499 cut-off events. [2025-03-17 14:30:53,605 INFO L125 PetriNetUnfolderBase]: For 7324/7963 co-relation queries the response was YES. [2025-03-17 14:30:53,609 INFO L83 FinitePrefix]: Finished finitePrefix Result has 9026 conditions, 2499 events. 1233/2499 cut-off events. For 7324/7963 co-relation queries the response was YES. Maximal size of possible extension queue 159. Compared 16373 event pairs, 702 based on Foata normal form. 180/2401 useless extension candidates. Maximal degree in co-relation 2989. Up to 1693 conditions per place. [2025-03-17 14:30:53,617 INFO L140 encePairwiseOnDemand]: 75/80 looper letters, 62 selfloop transitions, 5 changer transitions 0/92 dead transitions. [2025-03-17 14:30:53,617 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 101 places, 92 transitions, 669 flow [2025-03-17 14:30:53,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-03-17 14:30:53,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-03-17 14:30:53,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 188 transitions. [2025-03-17 14:30:53,618 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5875 [2025-03-17 14:30:53,618 INFO L175 Difference]: Start difference. First operand has 101 places, 95 transitions, 541 flow. Second operand 4 states and 188 transitions. [2025-03-17 14:30:53,618 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 101 places, 92 transitions, 669 flow [2025-03-17 14:30:53,622 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 95 places, 92 transitions, 647 flow, removed 0 selfloop flow, removed 6 redundant places. [2025-03-17 14:30:53,622 INFO L231 Difference]: Finished difference. Result has 95 places, 92 transitions, 523 flow [2025-03-17 14:30:53,623 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=513, PETRI_DIFFERENCE_MINUEND_PLACES=92, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=92, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=87, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=523, PETRI_PLACES=95, PETRI_TRANSITIONS=92} [2025-03-17 14:30:53,623 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 16 predicate places. [2025-03-17 14:30:53,623 INFO L471 AbstractCegarLoop]: Abstraction has has 95 places, 92 transitions, 523 flow [2025-03-17 14:30:53,623 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 42.5) internal successors, (170), 4 states have internal predecessors, (170), 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) [2025-03-17 14:30:53,623 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:53,623 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:53,623 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2025-03-17 14:30:53,623 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:53,624 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:53,624 INFO L85 PathProgramCache]: Analyzing trace with hash 414962143, now seen corresponding path program 1 times [2025-03-17 14:30:53,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:53,624 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604033419] [2025-03-17 14:30:53,624 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:53,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:53,629 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 14:30:53,633 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 14:30:53,633 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:53,634 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:53,690 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:30:53,691 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:53,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604033419] [2025-03-17 14:30:53,691 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604033419] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:53,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910051680] [2025-03-17 14:30:53,691 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:53,691 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:53,691 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:53,693 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:53,695 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2025-03-17 14:30:53,743 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 14:30:53,779 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 14:30:53,779 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:53,779 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:53,780 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-03-17 14:30:53,781 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:53,838 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:30:53,838 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:53,889 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:30:53,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910051680] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:30:53,889 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:30:53,889 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2025-03-17 14:30:53,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154358290] [2025-03-17 14:30:53,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:30:53,889 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2025-03-17 14:30:53,890 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:53,890 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2025-03-17 14:30:53,890 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2025-03-17 14:30:53,966 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:30:53,967 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 95 places, 92 transitions, 523 flow. Second operand has 14 states, 14 states have (on average 46.357142857142854) internal successors, (649), 14 states have internal predecessors, (649), 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) [2025-03-17 14:30:53,967 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:53,967 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:30:53,967 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:54,255 INFO L124 PetriNetUnfolderBase]: 1509/2898 cut-off events. [2025-03-17 14:30:54,255 INFO L125 PetriNetUnfolderBase]: For 7133/7669 co-relation queries the response was YES. [2025-03-17 14:30:54,260 INFO L83 FinitePrefix]: Finished finitePrefix Result has 9781 conditions, 2898 events. 1509/2898 cut-off events. For 7133/7669 co-relation queries the response was YES. Maximal size of possible extension queue 145. Compared 17877 event pairs, 578 based on Foata normal form. 68/2738 useless extension candidates. Maximal degree in co-relation 3751. Up to 813 conditions per place. [2025-03-17 14:30:54,268 INFO L140 encePairwiseOnDemand]: 63/80 looper letters, 85 selfloop transitions, 38 changer transitions 0/147 dead transitions. [2025-03-17 14:30:54,268 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 104 places, 147 transitions, 1047 flow [2025-03-17 14:30:54,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2025-03-17 14:30:54,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2025-03-17 14:30:54,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 548 transitions. [2025-03-17 14:30:54,270 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.685 [2025-03-17 14:30:54,270 INFO L175 Difference]: Start difference. First operand has 95 places, 92 transitions, 523 flow. Second operand 10 states and 548 transitions. [2025-03-17 14:30:54,270 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 104 places, 147 transitions, 1047 flow [2025-03-17 14:30:54,273 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 102 places, 147 transitions, 1041 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-03-17 14:30:54,274 INFO L231 Difference]: Finished difference. Result has 105 places, 96 transitions, 648 flow [2025-03-17 14:30:54,274 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=517, PETRI_DIFFERENCE_MINUEND_PLACES=93, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=92, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=34, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=54, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=648, PETRI_PLACES=105, PETRI_TRANSITIONS=96} [2025-03-17 14:30:54,275 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 26 predicate places. [2025-03-17 14:30:54,275 INFO L471 AbstractCegarLoop]: Abstraction has has 105 places, 96 transitions, 648 flow [2025-03-17 14:30:54,275 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 46.357142857142854) internal successors, (649), 14 states have internal predecessors, (649), 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) [2025-03-17 14:30:54,275 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:54,275 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:54,281 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2025-03-17 14:30:54,475 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2025-03-17 14:30:54,476 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting thread3Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:54,476 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:54,476 INFO L85 PathProgramCache]: Analyzing trace with hash -289084170, now seen corresponding path program 1 times [2025-03-17 14:30:54,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:54,476 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600659812] [2025-03-17 14:30:54,476 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:54,476 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:54,483 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 22 statements into 1 equivalence classes. [2025-03-17 14:30:54,488 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 22 of 22 statements. [2025-03-17 14:30:54,489 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:54,489 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:54,739 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:30:54,740 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:54,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600659812] [2025-03-17 14:30:54,740 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600659812] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:54,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491502342] [2025-03-17 14:30:54,740 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:54,740 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:54,740 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:54,742 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:54,743 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2025-03-17 14:30:54,796 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 22 statements into 1 equivalence classes. [2025-03-17 14:30:54,821 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 22 of 22 statements. [2025-03-17 14:30:54,821 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:54,821 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:54,822 INFO L256 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 42 conjuncts are in the unsatisfiable core [2025-03-17 14:30:54,824 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:54,837 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 10 treesize of output 9 [2025-03-17 14:30:54,894 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:30:54,895 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2025-03-17 14:30:54,946 INFO L349 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2025-03-17 14:30:54,947 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 37 [2025-03-17 14:30:55,120 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:30:55,120 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:55,490 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:30:55,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491502342] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:30:55,490 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:30:55,493 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 24 [2025-03-17 14:30:55,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565254999] [2025-03-17 14:30:55,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:30:55,494 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2025-03-17 14:30:55,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:55,494 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2025-03-17 14:30:55,494 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=538, Unknown=0, NotChecked=0, Total=650 [2025-03-17 14:30:57,101 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 80 [2025-03-17 14:30:57,102 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 105 places, 96 transitions, 648 flow. Second operand has 26 states, 26 states have (on average 34.30769230769231) internal successors, (892), 26 states have internal predecessors, (892), 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) [2025-03-17 14:30:57,103 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:30:57,103 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 80 [2025-03-17 14:30:57,103 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:30:58,348 INFO L124 PetriNetUnfolderBase]: 3301/5720 cut-off events. [2025-03-17 14:30:58,348 INFO L125 PetriNetUnfolderBase]: For 21006/21726 co-relation queries the response was YES. [2025-03-17 14:30:58,357 INFO L83 FinitePrefix]: Finished finitePrefix Result has 20826 conditions, 5720 events. 3301/5720 cut-off events. For 21006/21726 co-relation queries the response was YES. Maximal size of possible extension queue 238. Compared 36943 event pairs, 1028 based on Foata normal form. 0/5467 useless extension candidates. Maximal degree in co-relation 11053. Up to 1417 conditions per place. [2025-03-17 14:30:58,376 INFO L140 encePairwiseOnDemand]: 63/80 looper letters, 145 selfloop transitions, 38 changer transitions 0/201 dead transitions. [2025-03-17 14:30:58,377 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 125 places, 201 transitions, 1779 flow [2025-03-17 14:30:58,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2025-03-17 14:30:58,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2025-03-17 14:30:58,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 847 transitions. [2025-03-17 14:30:58,382 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.48125 [2025-03-17 14:30:58,382 INFO L175 Difference]: Start difference. First operand has 105 places, 96 transitions, 648 flow. Second operand 22 states and 847 transitions. [2025-03-17 14:30:58,382 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 125 places, 201 transitions, 1779 flow [2025-03-17 14:30:58,392 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 119 places, 201 transitions, 1702 flow, removed 6 selfloop flow, removed 6 redundant places. [2025-03-17 14:30:58,396 INFO L231 Difference]: Finished difference. Result has 120 places, 101 transitions, 687 flow [2025-03-17 14:30:58,396 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=579, PETRI_DIFFERENCE_MINUEND_PLACES=98, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=32, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=22, PETRI_FLOW=687, PETRI_PLACES=120, PETRI_TRANSITIONS=101} [2025-03-17 14:30:58,396 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 41 predicate places. [2025-03-17 14:30:58,396 INFO L471 AbstractCegarLoop]: Abstraction has has 120 places, 101 transitions, 687 flow [2025-03-17 14:30:58,397 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 34.30769230769231) internal successors, (892), 26 states have internal predecessors, (892), 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) [2025-03-17 14:30:58,397 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:30:58,397 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:30:58,402 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2025-03-17 14:30:58,597 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2025-03-17 14:30:58,597 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:30:58,597 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:30:58,597 INFO L85 PathProgramCache]: Analyzing trace with hash -371674062, now seen corresponding path program 1 times [2025-03-17 14:30:58,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:30:58,598 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580227059] [2025-03-17 14:30:58,598 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:58,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:30:58,612 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 23 statements into 1 equivalence classes. [2025-03-17 14:30:58,624 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 23 of 23 statements. [2025-03-17 14:30:58,624 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:58,625 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:58,818 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:30:58,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:30:58,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580227059] [2025-03-17 14:30:58,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580227059] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:30:58,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340832932] [2025-03-17 14:30:58,819 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:30:58,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:30:58,819 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:30:58,821 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:30:58,822 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2025-03-17 14:30:58,875 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 23 statements into 1 equivalence classes. [2025-03-17 14:30:58,896 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 23 of 23 statements. [2025-03-17 14:30:58,897 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:30:58,897 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:30:58,898 INFO L256 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 37 conjuncts are in the unsatisfiable core [2025-03-17 14:30:58,899 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:30:58,914 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 [2025-03-17 14:30:58,937 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 15 treesize of output 11 [2025-03-17 14:30:58,960 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 [2025-03-17 14:30:59,089 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:30:59,089 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:30:59,308 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:30:59,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340832932] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:30:59,308 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:30:59,309 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 22 [2025-03-17 14:30:59,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293548542] [2025-03-17 14:30:59,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:30:59,309 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2025-03-17 14:30:59,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:30:59,309 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2025-03-17 14:30:59,310 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2025-03-17 14:31:00,327 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 39 out of 80 [2025-03-17 14:31:00,328 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 120 places, 101 transitions, 687 flow. Second operand has 24 states, 24 states have (on average 41.5) internal successors, (996), 24 states have internal predecessors, (996), 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) [2025-03-17 14:31:00,328 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:00,328 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 39 of 80 [2025-03-17 14:31:00,328 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:01,009 INFO L124 PetriNetUnfolderBase]: 2136/3655 cut-off events. [2025-03-17 14:31:01,009 INFO L125 PetriNetUnfolderBase]: For 18689/20221 co-relation queries the response was YES. [2025-03-17 14:31:01,015 INFO L83 FinitePrefix]: Finished finitePrefix Result has 15517 conditions, 3655 events. 2136/3655 cut-off events. For 18689/20221 co-relation queries the response was YES. Maximal size of possible extension queue 188. Compared 22153 event pairs, 648 based on Foata normal form. 148/3493 useless extension candidates. Maximal degree in co-relation 10638. Up to 809 conditions per place. [2025-03-17 14:31:01,025 INFO L140 encePairwiseOnDemand]: 62/80 looper letters, 179 selfloop transitions, 49 changer transitions 0/250 dead transitions. [2025-03-17 14:31:01,025 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 137 places, 250 transitions, 2224 flow [2025-03-17 14:31:01,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2025-03-17 14:31:01,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2025-03-17 14:31:01,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 927 transitions. [2025-03-17 14:31:01,026 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6098684210526316 [2025-03-17 14:31:01,026 INFO L175 Difference]: Start difference. First operand has 120 places, 101 transitions, 687 flow. Second operand 19 states and 927 transitions. [2025-03-17 14:31:01,026 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 137 places, 250 transitions, 2224 flow [2025-03-17 14:31:01,032 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 130 places, 250 transitions, 2143 flow, removed 6 selfloop flow, removed 7 redundant places. [2025-03-17 14:31:01,034 INFO L231 Difference]: Finished difference. Result has 131 places, 111 transitions, 750 flow [2025-03-17 14:31:01,034 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=614, PETRI_DIFFERENCE_MINUEND_PLACES=112, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=100, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=38, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=19, PETRI_FLOW=750, PETRI_PLACES=131, PETRI_TRANSITIONS=111} [2025-03-17 14:31:01,035 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 52 predicate places. [2025-03-17 14:31:01,035 INFO L471 AbstractCegarLoop]: Abstraction has has 131 places, 111 transitions, 750 flow [2025-03-17 14:31:01,035 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 41.5) internal successors, (996), 24 states have internal predecessors, (996), 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) [2025-03-17 14:31:01,035 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:01,035 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:01,041 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2025-03-17 14:31:01,235 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2025-03-17 14:31:01,236 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting thread2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:01,236 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:01,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1214011931, now seen corresponding path program 1 times [2025-03-17 14:31:01,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:01,236 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042661512] [2025-03-17 14:31:01,236 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:01,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:01,242 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 23 statements into 1 equivalence classes. [2025-03-17 14:31:01,246 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 23 of 23 statements. [2025-03-17 14:31:01,246 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:01,246 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:01,317 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:31:01,317 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:01,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042661512] [2025-03-17 14:31:01,317 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2042661512] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:01,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445446812] [2025-03-17 14:31:01,318 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:01,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:01,318 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:01,320 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:01,322 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2025-03-17 14:31:01,375 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 23 statements into 1 equivalence classes. [2025-03-17 14:31:01,395 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 23 of 23 statements. [2025-03-17 14:31:01,395 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:01,395 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:01,396 INFO L256 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 9 conjuncts are in the unsatisfiable core [2025-03-17 14:31:01,398 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:01,471 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:31:01,471 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:01,526 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:31:01,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445446812] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:01,527 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:01,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2025-03-17 14:31:01,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038228707] [2025-03-17 14:31:01,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:01,527 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2025-03-17 14:31:01,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:01,527 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2025-03-17 14:31:01,527 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2025-03-17 14:31:01,642 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:31:01,643 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 131 places, 111 transitions, 750 flow. Second operand has 16 states, 16 states have (on average 46.4375) internal successors, (743), 16 states have internal predecessors, (743), 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) [2025-03-17 14:31:01,643 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:01,643 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:31:01,643 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:02,020 INFO L124 PetriNetUnfolderBase]: 2083/3696 cut-off events. [2025-03-17 14:31:02,021 INFO L125 PetriNetUnfolderBase]: For 17234/18190 co-relation queries the response was YES. [2025-03-17 14:31:02,027 INFO L83 FinitePrefix]: Finished finitePrefix Result has 15139 conditions, 3696 events. 2083/3696 cut-off events. For 17234/18190 co-relation queries the response was YES. Maximal size of possible extension queue 164. Compared 22889 event pairs, 739 based on Foata normal form. 123/3704 useless extension candidates. Maximal degree in co-relation 10456. Up to 904 conditions per place. [2025-03-17 14:31:02,036 INFO L140 encePairwiseOnDemand]: 63/80 looper letters, 103 selfloop transitions, 38 changer transitions 0/167 dead transitions. [2025-03-17 14:31:02,036 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 140 places, 167 transitions, 1356 flow [2025-03-17 14:31:02,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2025-03-17 14:31:02,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2025-03-17 14:31:02,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 546 transitions. [2025-03-17 14:31:02,037 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6825 [2025-03-17 14:31:02,037 INFO L175 Difference]: Start difference. First operand has 131 places, 111 transitions, 750 flow. Second operand 10 states and 546 transitions. [2025-03-17 14:31:02,037 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 140 places, 167 transitions, 1356 flow [2025-03-17 14:31:02,043 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 133 places, 167 transitions, 1300 flow, removed 0 selfloop flow, removed 7 redundant places. [2025-03-17 14:31:02,044 INFO L231 Difference]: Finished difference. Result has 136 places, 115 transitions, 825 flow [2025-03-17 14:31:02,045 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=694, PETRI_DIFFERENCE_MINUEND_PLACES=124, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=111, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=34, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=73, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=825, PETRI_PLACES=136, PETRI_TRANSITIONS=115} [2025-03-17 14:31:02,045 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 57 predicate places. [2025-03-17 14:31:02,045 INFO L471 AbstractCegarLoop]: Abstraction has has 136 places, 115 transitions, 825 flow [2025-03-17 14:31:02,045 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 46.4375) internal successors, (743), 16 states have internal predecessors, (743), 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) [2025-03-17 14:31:02,045 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:02,046 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:02,051 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2025-03-17 14:31:02,246 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:02,246 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:02,247 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:02,247 INFO L85 PathProgramCache]: Analyzing trace with hash -429618889, now seen corresponding path program 2 times [2025-03-17 14:31:02,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:02,247 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935044018] [2025-03-17 14:31:02,247 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:02,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:02,253 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 29 statements into 2 equivalence classes. [2025-03-17 14:31:02,264 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 29 of 29 statements. [2025-03-17 14:31:02,265 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:31:02,265 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:02,617 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:31:02,618 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:02,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935044018] [2025-03-17 14:31:02,618 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935044018] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:02,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239208758] [2025-03-17 14:31:02,618 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:02,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:02,618 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:02,620 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:02,621 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2025-03-17 14:31:02,681 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 29 statements into 2 equivalence classes. [2025-03-17 14:31:02,712 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 29 of 29 statements. [2025-03-17 14:31:02,712 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:31:02,712 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:02,717 INFO L256 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 27 conjuncts are in the unsatisfiable core [2025-03-17 14:31:02,719 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:02,721 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 6 treesize of output 5 [2025-03-17 14:31:02,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 14:31:02,772 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2025-03-17 14:31:02,787 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2025-03-17 14:31:02,788 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2025-03-17 14:31:02,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 14:31:02,821 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2025-03-17 14:31:02,831 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2025-03-17 14:31:02,831 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2025-03-17 14:31:02,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 14:31:02,853 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2025-03-17 14:31:02,857 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2025-03-17 14:31:02,857 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2025-03-17 14:31:02,935 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:02,935 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:03,273 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 162 treesize of output 156 [2025-03-17 14:31:03,490 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:03,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239208758] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:03,491 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:03,491 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 25 [2025-03-17 14:31:03,491 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561365351] [2025-03-17 14:31:03,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:03,491 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2025-03-17 14:31:03,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:03,492 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2025-03-17 14:31:03,492 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=620, Unknown=0, NotChecked=0, Total=702 [2025-03-17 14:31:06,907 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 33 out of 80 [2025-03-17 14:31:06,908 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 136 places, 115 transitions, 825 flow. Second operand has 27 states, 27 states have (on average 35.592592592592595) internal successors, (961), 27 states have internal predecessors, (961), 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) [2025-03-17 14:31:06,908 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:06,908 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 33 of 80 [2025-03-17 14:31:06,908 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:08,531 INFO L124 PetriNetUnfolderBase]: 4515/7320 cut-off events. [2025-03-17 14:31:08,531 INFO L125 PetriNetUnfolderBase]: For 32291/33051 co-relation queries the response was YES. [2025-03-17 14:31:08,543 INFO L83 FinitePrefix]: Finished finitePrefix Result has 30744 conditions, 7320 events. 4515/7320 cut-off events. For 32291/33051 co-relation queries the response was YES. Maximal size of possible extension queue 215. Compared 44686 event pairs, 845 based on Foata normal form. 124/7428 useless extension candidates. Maximal degree in co-relation 23107. Up to 1878 conditions per place. [2025-03-17 14:31:08,562 INFO L140 encePairwiseOnDemand]: 66/80 looper letters, 209 selfloop transitions, 44 changer transitions 0/273 dead transitions. [2025-03-17 14:31:08,562 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 153 places, 273 transitions, 2309 flow [2025-03-17 14:31:08,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2025-03-17 14:31:08,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2025-03-17 14:31:08,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 819 transitions. [2025-03-17 14:31:08,563 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5388157894736842 [2025-03-17 14:31:08,563 INFO L175 Difference]: Start difference. First operand has 136 places, 115 transitions, 825 flow. Second operand 19 states and 819 transitions. [2025-03-17 14:31:08,563 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 153 places, 273 transitions, 2309 flow [2025-03-17 14:31:08,575 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 147 places, 273 transitions, 2230 flow, removed 7 selfloop flow, removed 6 redundant places. [2025-03-17 14:31:08,577 INFO L231 Difference]: Finished difference. Result has 149 places, 122 transitions, 925 flow [2025-03-17 14:31:08,577 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=754, PETRI_DIFFERENCE_MINUEND_PLACES=129, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=114, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=36, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=77, PETRI_DIFFERENCE_SUBTRAHEND_STATES=19, PETRI_FLOW=925, PETRI_PLACES=149, PETRI_TRANSITIONS=122} [2025-03-17 14:31:08,577 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 70 predicate places. [2025-03-17 14:31:08,577 INFO L471 AbstractCegarLoop]: Abstraction has has 149 places, 122 transitions, 925 flow [2025-03-17 14:31:08,578 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 35.592592592592595) internal successors, (961), 27 states have internal predecessors, (961), 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) [2025-03-17 14:31:08,578 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:08,578 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:08,583 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2025-03-17 14:31:08,778 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2025-03-17 14:31:08,778 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:08,778 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:08,779 INFO L85 PathProgramCache]: Analyzing trace with hash -433283081, now seen corresponding path program 1 times [2025-03-17 14:31:08,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:08,779 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305729977] [2025-03-17 14:31:08,779 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:08,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:08,785 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 30 statements into 1 equivalence classes. [2025-03-17 14:31:08,793 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 30 of 30 statements. [2025-03-17 14:31:08,794 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:08,794 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:09,053 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2025-03-17 14:31:09,053 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:09,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305729977] [2025-03-17 14:31:09,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305729977] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:09,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136384040] [2025-03-17 14:31:09,054 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:09,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:09,054 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:09,055 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:09,057 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2025-03-17 14:31:09,115 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 30 statements into 1 equivalence classes. [2025-03-17 14:31:09,138 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 30 of 30 statements. [2025-03-17 14:31:09,139 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:09,139 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:09,143 INFO L256 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 47 conjuncts are in the unsatisfiable core [2025-03-17 14:31:09,145 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:09,155 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 10 treesize of output 9 [2025-03-17 14:31:09,193 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:31:09,193 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 22 [2025-03-17 14:31:09,301 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:31:09,301 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 31 [2025-03-17 14:31:09,527 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2025-03-17 14:31:09,527 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:09,781 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2025-03-17 14:31:09,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [136384040] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:09,781 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:09,781 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 24 [2025-03-17 14:31:09,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778957001] [2025-03-17 14:31:09,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:09,782 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2025-03-17 14:31:09,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:09,782 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2025-03-17 14:31:09,782 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=496, Unknown=0, NotChecked=0, Total=600 [2025-03-17 14:31:11,235 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 35 out of 80 [2025-03-17 14:31:11,236 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 149 places, 122 transitions, 925 flow. Second operand has 25 states, 25 states have (on average 37.36) internal successors, (934), 25 states have internal predecessors, (934), 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) [2025-03-17 14:31:11,236 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:11,236 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 35 of 80 [2025-03-17 14:31:11,236 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:12,230 INFO L124 PetriNetUnfolderBase]: 2326/4245 cut-off events. [2025-03-17 14:31:12,230 INFO L125 PetriNetUnfolderBase]: For 26673/27764 co-relation queries the response was YES. [2025-03-17 14:31:12,241 INFO L83 FinitePrefix]: Finished finitePrefix Result has 19458 conditions, 4245 events. 2326/4245 cut-off events. For 26673/27764 co-relation queries the response was YES. Maximal size of possible extension queue 157. Compared 26807 event pairs, 760 based on Foata normal form. 34/4165 useless extension candidates. Maximal degree in co-relation 14162. Up to 1261 conditions per place. [2025-03-17 14:31:12,255 INFO L140 encePairwiseOnDemand]: 66/80 looper letters, 151 selfloop transitions, 39 changer transitions 0/215 dead transitions. [2025-03-17 14:31:12,255 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 164 places, 215 transitions, 1902 flow [2025-03-17 14:31:12,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2025-03-17 14:31:12,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2025-03-17 14:31:12,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 693 transitions. [2025-03-17 14:31:12,256 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.54140625 [2025-03-17 14:31:12,256 INFO L175 Difference]: Start difference. First operand has 149 places, 122 transitions, 925 flow. Second operand 16 states and 693 transitions. [2025-03-17 14:31:12,256 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 164 places, 215 transitions, 1902 flow [2025-03-17 14:31:12,268 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 155 places, 215 transitions, 1839 flow, removed 4 selfloop flow, removed 9 redundant places. [2025-03-17 14:31:12,270 INFO L231 Difference]: Finished difference. Result has 158 places, 124 transitions, 976 flow [2025-03-17 14:31:12,270 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=862, PETRI_DIFFERENCE_MINUEND_PLACES=140, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=122, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=37, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=83, PETRI_DIFFERENCE_SUBTRAHEND_STATES=16, PETRI_FLOW=976, PETRI_PLACES=158, PETRI_TRANSITIONS=124} [2025-03-17 14:31:12,271 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 79 predicate places. [2025-03-17 14:31:12,271 INFO L471 AbstractCegarLoop]: Abstraction has has 158 places, 124 transitions, 976 flow [2025-03-17 14:31:12,271 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 37.36) internal successors, (934), 25 states have internal predecessors, (934), 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) [2025-03-17 14:31:12,271 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:12,271 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:12,277 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2025-03-17 14:31:12,474 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2025-03-17 14:31:12,474 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:12,474 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:12,474 INFO L85 PathProgramCache]: Analyzing trace with hash 1298221131, now seen corresponding path program 1 times [2025-03-17 14:31:12,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:12,474 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490070504] [2025-03-17 14:31:12,474 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:12,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:12,483 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 30 statements into 1 equivalence classes. [2025-03-17 14:31:12,487 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 30 of 30 statements. [2025-03-17 14:31:12,487 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:12,487 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:12,551 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:31:12,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:12,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490070504] [2025-03-17 14:31:12,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490070504] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:12,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946268312] [2025-03-17 14:31:12,552 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:12,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:12,552 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:12,554 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:12,555 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2025-03-17 14:31:12,614 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 30 statements into 1 equivalence classes. [2025-03-17 14:31:12,636 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 30 of 30 statements. [2025-03-17 14:31:12,636 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:12,636 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:12,637 INFO L256 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 6 conjuncts are in the unsatisfiable core [2025-03-17 14:31:12,638 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:12,666 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:31:12,667 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:12,697 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:31:12,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946268312] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:12,697 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:31:12,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 10 [2025-03-17 14:31:12,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753047914] [2025-03-17 14:31:12,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:31:12,698 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:31:12,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:12,698 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:31:12,698 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2025-03-17 14:31:12,719 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:31:12,719 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 158 places, 124 transitions, 976 flow. Second operand has 5 states, 5 states have (on average 49.8) internal successors, (249), 5 states have internal predecessors, (249), 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) [2025-03-17 14:31:12,719 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:12,719 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:31:12,719 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:13,083 INFO L124 PetriNetUnfolderBase]: 2113/3992 cut-off events. [2025-03-17 14:31:13,083 INFO L125 PetriNetUnfolderBase]: For 30847/31781 co-relation queries the response was YES. [2025-03-17 14:31:13,092 INFO L83 FinitePrefix]: Finished finitePrefix Result has 18365 conditions, 3992 events. 2113/3992 cut-off events. For 30847/31781 co-relation queries the response was YES. Maximal size of possible extension queue 153. Compared 25910 event pairs, 807 based on Foata normal form. 152/3949 useless extension candidates. Maximal degree in co-relation 13271. Up to 1829 conditions per place. [2025-03-17 14:31:13,102 INFO L140 encePairwiseOnDemand]: 74/80 looper letters, 110 selfloop transitions, 12 changer transitions 0/149 dead transitions. [2025-03-17 14:31:13,102 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 162 places, 149 transitions, 1357 flow [2025-03-17 14:31:13,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 14:31:13,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-17 14:31:13,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 268 transitions. [2025-03-17 14:31:13,103 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.67 [2025-03-17 14:31:13,103 INFO L175 Difference]: Start difference. First operand has 158 places, 124 transitions, 976 flow. Second operand 5 states and 268 transitions. [2025-03-17 14:31:13,103 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 162 places, 149 transitions, 1357 flow [2025-03-17 14:31:13,118 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 148 places, 149 transitions, 1285 flow, removed 0 selfloop flow, removed 14 redundant places. [2025-03-17 14:31:13,119 INFO L231 Difference]: Finished difference. Result has 149 places, 122 transitions, 899 flow [2025-03-17 14:31:13,120 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=854, PETRI_DIFFERENCE_MINUEND_PLACES=144, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=121, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=11, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=109, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=899, PETRI_PLACES=149, PETRI_TRANSITIONS=122} [2025-03-17 14:31:13,120 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 70 predicate places. [2025-03-17 14:31:13,120 INFO L471 AbstractCegarLoop]: Abstraction has has 149 places, 122 transitions, 899 flow [2025-03-17 14:31:13,120 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 49.8) internal successors, (249), 5 states have internal predecessors, (249), 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) [2025-03-17 14:31:13,120 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:13,120 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:13,127 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2025-03-17 14:31:13,320 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2025-03-17 14:31:13,321 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting thread2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:13,321 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:13,321 INFO L85 PathProgramCache]: Analyzing trace with hash -1107564739, now seen corresponding path program 2 times [2025-03-17 14:31:13,321 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:13,321 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096258505] [2025-03-17 14:31:13,321 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:13,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:13,328 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 31 statements into 2 equivalence classes. [2025-03-17 14:31:13,346 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 31 of 31 statements. [2025-03-17 14:31:13,346 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:31:13,347 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:13,600 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:13,600 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:13,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096258505] [2025-03-17 14:31:13,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096258505] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:13,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329877312] [2025-03-17 14:31:13,600 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:13,600 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:13,600 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:13,602 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:13,603 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2025-03-17 14:31:13,658 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 31 statements into 2 equivalence classes. [2025-03-17 14:31:13,686 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 31 of 31 statements. [2025-03-17 14:31:13,686 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:31:13,686 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:13,687 INFO L256 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 48 conjuncts are in the unsatisfiable core [2025-03-17 14:31:13,689 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:13,693 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 10 treesize of output 9 [2025-03-17 14:31:13,756 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:31:13,757 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2025-03-17 14:31:13,817 INFO L349 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2025-03-17 14:31:13,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 37 [2025-03-17 14:31:13,876 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:31:13,876 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 31 [2025-03-17 14:31:14,143 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:14,143 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:14,421 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:14,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329877312] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:14,421 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:14,421 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 7] total 24 [2025-03-17 14:31:14,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334516409] [2025-03-17 14:31:14,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:14,422 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2025-03-17 14:31:14,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:14,422 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2025-03-17 14:31:14,422 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2025-03-17 14:31:16,715 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 29 out of 80 [2025-03-17 14:31:16,716 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 149 places, 122 transitions, 899 flow. Second operand has 26 states, 26 states have (on average 31.76923076923077) internal successors, (826), 26 states have internal predecessors, (826), 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) [2025-03-17 14:31:16,716 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:16,716 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 29 of 80 [2025-03-17 14:31:16,716 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:18,459 INFO L124 PetriNetUnfolderBase]: 3226/5309 cut-off events. [2025-03-17 14:31:18,459 INFO L125 PetriNetUnfolderBase]: For 31586/32186 co-relation queries the response was YES. [2025-03-17 14:31:18,469 INFO L83 FinitePrefix]: Finished finitePrefix Result has 22213 conditions, 5309 events. 3226/5309 cut-off events. For 31586/32186 co-relation queries the response was YES. Maximal size of possible extension queue 160. Compared 30721 event pairs, 452 based on Foata normal form. 171/5466 useless extension candidates. Maximal degree in co-relation 22166. Up to 882 conditions per place. [2025-03-17 14:31:18,483 INFO L140 encePairwiseOnDemand]: 66/80 looper letters, 167 selfloop transitions, 33 changer transitions 0/221 dead transitions. [2025-03-17 14:31:18,483 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 158 places, 221 transitions, 1922 flow [2025-03-17 14:31:18,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2025-03-17 14:31:18,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2025-03-17 14:31:18,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 736 transitions. [2025-03-17 14:31:18,484 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.4842105263157895 [2025-03-17 14:31:18,484 INFO L175 Difference]: Start difference. First operand has 149 places, 122 transitions, 899 flow. Second operand 19 states and 736 transitions. [2025-03-17 14:31:18,484 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 158 places, 221 transitions, 1922 flow [2025-03-17 14:31:18,493 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 141 places, 221 transitions, 1745 flow, removed 19 selfloop flow, removed 17 redundant places. [2025-03-17 14:31:18,495 INFO L231 Difference]: Finished difference. Result has 143 places, 102 transitions, 731 flow [2025-03-17 14:31:18,495 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=630, PETRI_DIFFERENCE_MINUEND_PLACES=123, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=98, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=29, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=68, PETRI_DIFFERENCE_SUBTRAHEND_STATES=19, PETRI_FLOW=731, PETRI_PLACES=143, PETRI_TRANSITIONS=102} [2025-03-17 14:31:18,495 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 64 predicate places. [2025-03-17 14:31:18,495 INFO L471 AbstractCegarLoop]: Abstraction has has 143 places, 102 transitions, 731 flow [2025-03-17 14:31:18,496 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 31.76923076923077) internal successors, (826), 26 states have internal predecessors, (826), 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) [2025-03-17 14:31:18,496 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:18,496 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:18,502 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2025-03-17 14:31:18,696 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2025-03-17 14:31:18,696 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:18,697 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:18,697 INFO L85 PathProgramCache]: Analyzing trace with hash -546873031, now seen corresponding path program 1 times [2025-03-17 14:31:18,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:18,697 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181939701] [2025-03-17 14:31:18,697 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:18,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:18,703 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 31 statements into 1 equivalence classes. [2025-03-17 14:31:18,708 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 31 of 31 statements. [2025-03-17 14:31:18,709 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:18,709 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:18,919 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 7 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:31:18,919 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:18,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181939701] [2025-03-17 14:31:18,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181939701] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:18,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576916876] [2025-03-17 14:31:18,919 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:18,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:18,919 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:18,921 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:18,921 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2025-03-17 14:31:18,977 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 31 statements into 1 equivalence classes. [2025-03-17 14:31:18,998 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 31 of 31 statements. [2025-03-17 14:31:18,998 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:18,998 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:18,999 INFO L256 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 40 conjuncts are in the unsatisfiable core [2025-03-17 14:31:19,000 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:19,010 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 10 treesize of output 9 [2025-03-17 14:31:19,039 INFO L349 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2025-03-17 14:31:19,040 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2025-03-17 14:31:19,246 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2025-03-17 14:31:19,247 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:19,393 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2025-03-17 14:31:19,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576916876] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:19,393 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:19,394 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 7] total 24 [2025-03-17 14:31:19,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241216885] [2025-03-17 14:31:19,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:19,394 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2025-03-17 14:31:19,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:19,394 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2025-03-17 14:31:19,394 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2025-03-17 14:31:20,872 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 35 out of 80 [2025-03-17 14:31:20,873 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 143 places, 102 transitions, 731 flow. Second operand has 25 states, 25 states have (on average 37.48) internal successors, (937), 25 states have internal predecessors, (937), 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) [2025-03-17 14:31:20,873 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:20,873 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 35 of 80 [2025-03-17 14:31:20,873 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:21,765 INFO L124 PetriNetUnfolderBase]: 1445/2827 cut-off events. [2025-03-17 14:31:21,765 INFO L125 PetriNetUnfolderBase]: For 18064/18643 co-relation queries the response was YES. [2025-03-17 14:31:21,772 INFO L83 FinitePrefix]: Finished finitePrefix Result has 12366 conditions, 2827 events. 1445/2827 cut-off events. For 18064/18643 co-relation queries the response was YES. Maximal size of possible extension queue 101. Compared 16527 event pairs, 647 based on Foata normal form. 84/2807 useless extension candidates. Maximal degree in co-relation 9107. Up to 837 conditions per place. [2025-03-17 14:31:21,780 INFO L140 encePairwiseOnDemand]: 66/80 looper letters, 99 selfloop transitions, 22 changer transitions 0/145 dead transitions. [2025-03-17 14:31:21,780 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 158 places, 145 transitions, 1226 flow [2025-03-17 14:31:21,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2025-03-17 14:31:21,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2025-03-17 14:31:21,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 666 transitions. [2025-03-17 14:31:21,781 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5203125 [2025-03-17 14:31:21,781 INFO L175 Difference]: Start difference. First operand has 143 places, 102 transitions, 731 flow. Second operand 16 states and 666 transitions. [2025-03-17 14:31:21,781 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 158 places, 145 transitions, 1226 flow [2025-03-17 14:31:21,790 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 142 places, 145 transitions, 1117 flow, removed 18 selfloop flow, removed 16 redundant places. [2025-03-17 14:31:21,792 INFO L231 Difference]: Finished difference. Result has 143 places, 101 transitions, 685 flow [2025-03-17 14:31:21,792 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=637, PETRI_DIFFERENCE_MINUEND_PLACES=127, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=101, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=22, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=79, PETRI_DIFFERENCE_SUBTRAHEND_STATES=16, PETRI_FLOW=685, PETRI_PLACES=143, PETRI_TRANSITIONS=101} [2025-03-17 14:31:21,792 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 64 predicate places. [2025-03-17 14:31:21,792 INFO L471 AbstractCegarLoop]: Abstraction has has 143 places, 101 transitions, 685 flow [2025-03-17 14:31:21,792 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 37.48) internal successors, (937), 25 states have internal predecessors, (937), 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) [2025-03-17 14:31:21,792 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:21,793 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:21,798 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2025-03-17 14:31:21,993 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:21,993 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:21,993 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:21,993 INFO L85 PathProgramCache]: Analyzing trace with hash 25232061, now seen corresponding path program 1 times [2025-03-17 14:31:21,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:21,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182893995] [2025-03-17 14:31:21,994 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:21,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:21,999 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 32 statements into 1 equivalence classes. [2025-03-17 14:31:22,006 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 32 of 32 statements. [2025-03-17 14:31:22,006 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:22,006 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:22,429 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2025-03-17 14:31:22,429 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:22,429 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182893995] [2025-03-17 14:31:22,430 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [182893995] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:22,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061596796] [2025-03-17 14:31:22,430 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:22,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:22,430 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:22,432 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:22,432 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2025-03-17 14:31:22,504 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 32 statements into 1 equivalence classes. [2025-03-17 14:31:22,533 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 32 of 32 statements. [2025-03-17 14:31:22,533 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:22,533 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:22,535 INFO L256 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 51 conjuncts are in the unsatisfiable core [2025-03-17 14:31:22,538 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:22,559 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 10 treesize of output 9 [2025-03-17 14:31:22,592 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:31:22,592 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 22 [2025-03-17 14:31:22,697 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:31:22,698 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 31 [2025-03-17 14:31:22,987 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2025-03-17 14:31:22,987 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:23,212 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2025-03-17 14:31:23,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061596796] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:23,213 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:23,213 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 8] total 28 [2025-03-17 14:31:23,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413129155] [2025-03-17 14:31:23,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:23,213 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2025-03-17 14:31:23,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:23,214 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2025-03-17 14:31:23,214 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=711, Unknown=0, NotChecked=0, Total=812 [2025-03-17 14:31:25,970 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 80 [2025-03-17 14:31:25,970 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 143 places, 101 transitions, 685 flow. Second operand has 29 states, 29 states have (on average 34.44827586206897) internal successors, (999), 29 states have internal predecessors, (999), 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) [2025-03-17 14:31:25,970 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:25,970 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 80 [2025-03-17 14:31:25,970 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:27,859 INFO L124 PetriNetUnfolderBase]: 3460/5634 cut-off events. [2025-03-17 14:31:27,859 INFO L125 PetriNetUnfolderBase]: For 26640/26776 co-relation queries the response was YES. [2025-03-17 14:31:27,871 INFO L83 FinitePrefix]: Finished finitePrefix Result has 22915 conditions, 5634 events. 3460/5634 cut-off events. For 26640/26776 co-relation queries the response was YES. Maximal size of possible extension queue 171. Compared 31918 event pairs, 936 based on Foata normal form. 84/5563 useless extension candidates. Maximal degree in co-relation 17251. Up to 1633 conditions per place. [2025-03-17 14:31:27,887 INFO L140 encePairwiseOnDemand]: 62/80 looper letters, 153 selfloop transitions, 34 changer transitions 0/205 dead transitions. [2025-03-17 14:31:27,887 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 159 places, 205 transitions, 1669 flow [2025-03-17 14:31:27,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2025-03-17 14:31:27,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2025-03-17 14:31:27,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 706 transitions. [2025-03-17 14:31:27,888 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5191176470588236 [2025-03-17 14:31:27,888 INFO L175 Difference]: Start difference. First operand has 143 places, 101 transitions, 685 flow. Second operand 17 states and 706 transitions. [2025-03-17 14:31:27,888 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 159 places, 205 transitions, 1669 flow [2025-03-17 14:31:27,899 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 154 places, 205 transitions, 1641 flow, removed 0 selfloop flow, removed 5 redundant places. [2025-03-17 14:31:27,901 INFO L231 Difference]: Finished difference. Result has 158 places, 107 transitions, 815 flow [2025-03-17 14:31:27,901 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=675, PETRI_DIFFERENCE_MINUEND_PLACES=138, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=101, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=28, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=68, PETRI_DIFFERENCE_SUBTRAHEND_STATES=17, PETRI_FLOW=815, PETRI_PLACES=158, PETRI_TRANSITIONS=107} [2025-03-17 14:31:27,901 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 79 predicate places. [2025-03-17 14:31:27,901 INFO L471 AbstractCegarLoop]: Abstraction has has 158 places, 107 transitions, 815 flow [2025-03-17 14:31:27,902 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 34.44827586206897) internal successors, (999), 29 states have internal predecessors, (999), 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) [2025-03-17 14:31:27,902 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:27,902 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:27,908 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2025-03-17 14:31:28,102 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2025-03-17 14:31:28,102 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:28,103 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:28,103 INFO L85 PathProgramCache]: Analyzing trace with hash 782194495, now seen corresponding path program 1 times [2025-03-17 14:31:28,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:28,103 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351174848] [2025-03-17 14:31:28,103 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:28,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:28,111 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 33 statements into 1 equivalence classes. [2025-03-17 14:31:28,117 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 33 of 33 statements. [2025-03-17 14:31:28,118 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:28,118 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:28,301 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2025-03-17 14:31:28,302 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:28,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351174848] [2025-03-17 14:31:28,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351174848] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:28,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804313564] [2025-03-17 14:31:28,302 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:28,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:28,302 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:28,304 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:28,306 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2025-03-17 14:31:28,370 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 33 statements into 1 equivalence classes. [2025-03-17 14:31:28,395 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 33 of 33 statements. [2025-03-17 14:31:28,395 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:28,395 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:28,397 INFO L256 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 39 conjuncts are in the unsatisfiable core [2025-03-17 14:31:28,398 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:28,413 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 [2025-03-17 14:31:28,483 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:31:28,483 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 27 [2025-03-17 14:31:28,585 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2025-03-17 14:31:28,585 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:28,732 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2025-03-17 14:31:28,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804313564] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:28,732 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:28,732 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 8] total 26 [2025-03-17 14:31:28,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138086753] [2025-03-17 14:31:28,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:28,732 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2025-03-17 14:31:28,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:28,733 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2025-03-17 14:31:28,733 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2025-03-17 14:31:30,496 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 38 out of 80 [2025-03-17 14:31:30,497 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 158 places, 107 transitions, 815 flow. Second operand has 27 states, 27 states have (on average 40.74074074074074) internal successors, (1100), 27 states have internal predecessors, (1100), 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) [2025-03-17 14:31:30,497 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:30,497 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 38 of 80 [2025-03-17 14:31:30,497 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:32,003 INFO L124 PetriNetUnfolderBase]: 3159/5301 cut-off events. [2025-03-17 14:31:32,003 INFO L125 PetriNetUnfolderBase]: For 33046/34067 co-relation queries the response was YES. [2025-03-17 14:31:32,015 INFO L83 FinitePrefix]: Finished finitePrefix Result has 24100 conditions, 5301 events. 3159/5301 cut-off events. For 33046/34067 co-relation queries the response was YES. Maximal size of possible extension queue 167. Compared 30229 event pairs, 776 based on Foata normal form. 172/5278 useless extension candidates. Maximal degree in co-relation 18299. Up to 842 conditions per place. [2025-03-17 14:31:32,032 INFO L140 encePairwiseOnDemand]: 61/80 looper letters, 213 selfloop transitions, 64 changer transitions 0/303 dead transitions. [2025-03-17 14:31:32,032 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 182 places, 303 transitions, 2720 flow [2025-03-17 14:31:32,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2025-03-17 14:31:32,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2025-03-17 14:31:32,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 1243 transitions. [2025-03-17 14:31:32,033 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5975961538461538 [2025-03-17 14:31:32,033 INFO L175 Difference]: Start difference. First operand has 158 places, 107 transitions, 815 flow. Second operand 26 states and 1243 transitions. [2025-03-17 14:31:32,033 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 182 places, 303 transitions, 2720 flow [2025-03-17 14:31:32,048 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 170 places, 303 transitions, 2628 flow, removed 8 selfloop flow, removed 12 redundant places. [2025-03-17 14:31:32,050 INFO L231 Difference]: Finished difference. Result has 175 places, 139 transitions, 1224 flow [2025-03-17 14:31:32,051 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=757, PETRI_DIFFERENCE_MINUEND_PLACES=145, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=106, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=34, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=66, PETRI_DIFFERENCE_SUBTRAHEND_STATES=26, PETRI_FLOW=1224, PETRI_PLACES=175, PETRI_TRANSITIONS=139} [2025-03-17 14:31:32,051 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 96 predicate places. [2025-03-17 14:31:32,051 INFO L471 AbstractCegarLoop]: Abstraction has has 175 places, 139 transitions, 1224 flow [2025-03-17 14:31:32,051 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 40.74074074074074) internal successors, (1100), 27 states have internal predecessors, (1100), 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) [2025-03-17 14:31:32,051 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:32,051 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:32,058 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2025-03-17 14:31:32,252 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:32,252 INFO L396 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:32,252 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:32,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1378747670, now seen corresponding path program 1 times [2025-03-17 14:31:32,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:32,252 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480899835] [2025-03-17 14:31:32,252 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:32,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:32,258 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 34 statements into 1 equivalence classes. [2025-03-17 14:31:32,262 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 34 of 34 statements. [2025-03-17 14:31:32,262 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:32,262 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:32,329 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:31:32,329 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:32,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480899835] [2025-03-17 14:31:32,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480899835] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:32,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361867451] [2025-03-17 14:31:32,330 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:31:32,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:32,330 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:32,332 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:32,334 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2025-03-17 14:31:32,394 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 34 statements into 1 equivalence classes. [2025-03-17 14:31:32,414 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 34 of 34 statements. [2025-03-17 14:31:32,414 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:32,414 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:32,415 INFO L256 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-03-17 14:31:32,415 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:32,461 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:31:32,461 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:32,499 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:31:32,499 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361867451] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:32,499 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:31:32,499 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8, 6] total 14 [2025-03-17 14:31:32,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686291583] [2025-03-17 14:31:32,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:31:32,500 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:31:32,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:32,500 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:31:32,500 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2025-03-17 14:31:32,551 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 43 out of 80 [2025-03-17 14:31:32,551 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 175 places, 139 transitions, 1224 flow. Second operand has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 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) [2025-03-17 14:31:32,551 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:32,551 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 43 of 80 [2025-03-17 14:31:32,551 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:33,152 INFO L124 PetriNetUnfolderBase]: 3363/6185 cut-off events. [2025-03-17 14:31:33,152 INFO L125 PetriNetUnfolderBase]: For 34659/35455 co-relation queries the response was YES. [2025-03-17 14:31:33,167 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28019 conditions, 6185 events. 3363/6185 cut-off events. For 34659/35455 co-relation queries the response was YES. Maximal size of possible extension queue 184. Compared 40262 event pairs, 1146 based on Foata normal form. 0/5781 useless extension candidates. Maximal degree in co-relation 21215. Up to 2306 conditions per place. [2025-03-17 14:31:33,183 INFO L140 encePairwiseOnDemand]: 71/80 looper letters, 177 selfloop transitions, 36 changer transitions 0/242 dead transitions. [2025-03-17 14:31:33,183 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 183 places, 242 transitions, 2536 flow [2025-03-17 14:31:33,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2025-03-17 14:31:33,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2025-03-17 14:31:33,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 478 transitions. [2025-03-17 14:31:33,184 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6638888888888889 [2025-03-17 14:31:33,184 INFO L175 Difference]: Start difference. First operand has 175 places, 139 transitions, 1224 flow. Second operand 9 states and 478 transitions. [2025-03-17 14:31:33,184 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 183 places, 242 transitions, 2536 flow [2025-03-17 14:31:33,211 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 174 places, 242 transitions, 2479 flow, removed 1 selfloop flow, removed 9 redundant places. [2025-03-17 14:31:33,213 INFO L231 Difference]: Finished difference. Result has 176 places, 161 transitions, 1449 flow [2025-03-17 14:31:33,213 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=1185, PETRI_DIFFERENCE_MINUEND_PLACES=166, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=139, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=16, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=121, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=1449, PETRI_PLACES=176, PETRI_TRANSITIONS=161} [2025-03-17 14:31:33,213 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 97 predicate places. [2025-03-17 14:31:33,213 INFO L471 AbstractCegarLoop]: Abstraction has has 176 places, 161 transitions, 1449 flow [2025-03-17 14:31:33,214 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 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) [2025-03-17 14:31:33,214 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:33,214 INFO L206 CegarLoopForPetriNet]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:33,220 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2025-03-17 14:31:33,414 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:33,414 INFO L396 AbstractCegarLoop]: === Iteration 34 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:33,415 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:33,415 INFO L85 PathProgramCache]: Analyzing trace with hash -1082842448, now seen corresponding path program 2 times [2025-03-17 14:31:33,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:33,415 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30089257] [2025-03-17 14:31:33,415 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:33,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:33,421 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 34 statements into 2 equivalence classes. [2025-03-17 14:31:33,432 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 34 of 34 statements. [2025-03-17 14:31:33,432 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:31:33,432 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:33,502 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:33,502 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:33,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30089257] [2025-03-17 14:31:33,502 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30089257] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:33,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107070549] [2025-03-17 14:31:33,502 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:33,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:33,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:33,504 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:33,506 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2025-03-17 14:31:33,571 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 34 statements into 2 equivalence classes. [2025-03-17 14:31:33,613 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 34 of 34 statements. [2025-03-17 14:31:33,613 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:31:33,613 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:33,614 INFO L256 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 10 conjuncts are in the unsatisfiable core [2025-03-17 14:31:33,615 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:33,681 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:33,681 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:33,748 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:33,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107070549] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:33,748 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:33,749 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2025-03-17 14:31:33,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072610361] [2025-03-17 14:31:33,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:33,749 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2025-03-17 14:31:33,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:33,749 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2025-03-17 14:31:33,750 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=245, Unknown=0, NotChecked=0, Total=342 [2025-03-17 14:31:33,892 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:31:33,892 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 176 places, 161 transitions, 1449 flow. Second operand has 19 states, 19 states have (on average 46.26315789473684) internal successors, (879), 19 states have internal predecessors, (879), 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) [2025-03-17 14:31:33,892 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:33,892 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:31:33,893 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:34,700 INFO L124 PetriNetUnfolderBase]: 3164/5770 cut-off events. [2025-03-17 14:31:34,700 INFO L125 PetriNetUnfolderBase]: For 41750/42992 co-relation queries the response was YES. [2025-03-17 14:31:34,720 INFO L83 FinitePrefix]: Finished finitePrefix Result has 27857 conditions, 5770 events. 3164/5770 cut-off events. For 41750/42992 co-relation queries the response was YES. Maximal size of possible extension queue 146. Compared 36217 event pairs, 1219 based on Foata normal form. 100/5633 useless extension candidates. Maximal degree in co-relation 22235. Up to 1710 conditions per place. [2025-03-17 14:31:34,765 INFO L140 encePairwiseOnDemand]: 63/80 looper letters, 195 selfloop transitions, 66 changer transitions 0/299 dead transitions. [2025-03-17 14:31:34,765 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 191 places, 299 transitions, 3155 flow [2025-03-17 14:31:34,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2025-03-17 14:31:34,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2025-03-17 14:31:34,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 858 transitions. [2025-03-17 14:31:34,767 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6703125 [2025-03-17 14:31:34,767 INFO L175 Difference]: Start difference. First operand has 176 places, 161 transitions, 1449 flow. Second operand 16 states and 858 transitions. [2025-03-17 14:31:34,767 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 191 places, 299 transitions, 3155 flow [2025-03-17 14:31:34,806 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 189 places, 299 transitions, 3152 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-03-17 14:31:34,809 INFO L231 Difference]: Finished difference. Result has 194 places, 178 transitions, 1807 flow [2025-03-17 14:31:34,809 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=1446, PETRI_DIFFERENCE_MINUEND_PLACES=174, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=161, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=49, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=104, PETRI_DIFFERENCE_SUBTRAHEND_STATES=16, PETRI_FLOW=1807, PETRI_PLACES=194, PETRI_TRANSITIONS=178} [2025-03-17 14:31:34,810 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 115 predicate places. [2025-03-17 14:31:34,810 INFO L471 AbstractCegarLoop]: Abstraction has has 194 places, 178 transitions, 1807 flow [2025-03-17 14:31:34,810 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 46.26315789473684) internal successors, (879), 19 states have internal predecessors, (879), 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) [2025-03-17 14:31:34,812 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:34,812 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:34,818 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2025-03-17 14:31:35,012 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:35,013 INFO L396 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:35,013 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:35,013 INFO L85 PathProgramCache]: Analyzing trace with hash 1074215244, now seen corresponding path program 2 times [2025-03-17 14:31:35,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:35,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263352807] [2025-03-17 14:31:35,013 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:35,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:35,022 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 34 statements into 2 equivalence classes. [2025-03-17 14:31:35,026 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) and asserted 21 of 34 statements. [2025-03-17 14:31:35,026 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2025-03-17 14:31:35,026 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:35,064 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:31:35,065 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:35,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263352807] [2025-03-17 14:31:35,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1263352807] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:31:35,065 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:31:35,065 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2025-03-17 14:31:35,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735695053] [2025-03-17 14:31:35,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:31:35,065 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-03-17 14:31:35,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:35,065 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-03-17 14:31:35,066 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2025-03-17 14:31:35,099 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:31:35,099 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 194 places, 178 transitions, 1807 flow. Second operand has 6 states, 6 states have (on average 49.0) internal successors, (294), 6 states have internal predecessors, (294), 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) [2025-03-17 14:31:35,099 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:35,099 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:31:35,099 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:35,782 INFO L124 PetriNetUnfolderBase]: 2886/5493 cut-off events. [2025-03-17 14:31:35,782 INFO L125 PetriNetUnfolderBase]: For 42663/43547 co-relation queries the response was YES. [2025-03-17 14:31:35,799 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28377 conditions, 5493 events. 2886/5493 cut-off events. For 42663/43547 co-relation queries the response was YES. Maximal size of possible extension queue 154. Compared 36382 event pairs, 1336 based on Foata normal form. 89/5306 useless extension candidates. Maximal degree in co-relation 23554. Up to 2934 conditions per place. [2025-03-17 14:31:35,816 INFO L140 encePairwiseOnDemand]: 73/80 looper letters, 180 selfloop transitions, 43 changer transitions 12/269 dead transitions. [2025-03-17 14:31:35,816 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 199 places, 269 transitions, 3337 flow [2025-03-17 14:31:35,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:31:35,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:31:35,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 338 transitions. [2025-03-17 14:31:35,817 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.7041666666666667 [2025-03-17 14:31:35,817 INFO L175 Difference]: Start difference. First operand has 194 places, 178 transitions, 1807 flow. Second operand 6 states and 338 transitions. [2025-03-17 14:31:35,817 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 199 places, 269 transitions, 3337 flow [2025-03-17 14:31:35,861 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 193 places, 269 transitions, 3245 flow, removed 7 selfloop flow, removed 6 redundant places. [2025-03-17 14:31:35,864 INFO L231 Difference]: Finished difference. Result has 197 places, 201 transitions, 2136 flow [2025-03-17 14:31:35,864 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=1715, PETRI_DIFFERENCE_MINUEND_PLACES=188, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=178, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=20, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=150, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=2136, PETRI_PLACES=197, PETRI_TRANSITIONS=201} [2025-03-17 14:31:35,864 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 118 predicate places. [2025-03-17 14:31:35,864 INFO L471 AbstractCegarLoop]: Abstraction has has 197 places, 201 transitions, 2136 flow [2025-03-17 14:31:35,864 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 49.0) internal successors, (294), 6 states have internal predecessors, (294), 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) [2025-03-17 14:31:35,864 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:35,864 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:35,865 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2025-03-17 14:31:35,865 INFO L396 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:35,865 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:35,865 INFO L85 PathProgramCache]: Analyzing trace with hash -2003259976, now seen corresponding path program 3 times [2025-03-17 14:31:35,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:35,865 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574043016] [2025-03-17 14:31:35,865 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2025-03-17 14:31:35,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:35,872 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 partitioned 34 statements into 3 equivalence classes. [2025-03-17 14:31:35,874 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) and asserted 21 of 34 statements. [2025-03-17 14:31:35,874 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2025-03-17 14:31:35,874 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:35,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:31:35,904 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:35,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574043016] [2025-03-17 14:31:35,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574043016] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:31:35,904 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:31:35,905 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2025-03-17 14:31:35,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043046058] [2025-03-17 14:31:35,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:31:35,905 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-03-17 14:31:35,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:35,905 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-03-17 14:31:35,905 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2025-03-17 14:31:35,956 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:31:35,957 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 197 places, 201 transitions, 2136 flow. Second operand has 6 states, 6 states have (on average 49.0) internal successors, (294), 6 states have internal predecessors, (294), 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) [2025-03-17 14:31:35,957 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:35,957 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:31:35,957 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:36,823 INFO L124 PetriNetUnfolderBase]: 4169/7720 cut-off events. [2025-03-17 14:31:36,823 INFO L125 PetriNetUnfolderBase]: For 73266/75098 co-relation queries the response was YES. [2025-03-17 14:31:36,847 INFO L83 FinitePrefix]: Finished finitePrefix Result has 41990 conditions, 7720 events. 4169/7720 cut-off events. For 73266/75098 co-relation queries the response was YES. Maximal size of possible extension queue 226. Compared 53834 event pairs, 1601 based on Foata normal form. 201/7544 useless extension candidates. Maximal degree in co-relation 41559. Up to 3802 conditions per place. [2025-03-17 14:31:36,875 INFO L140 encePairwiseOnDemand]: 73/80 looper letters, 221 selfloop transitions, 46 changer transitions 12/313 dead transitions. [2025-03-17 14:31:36,876 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 202 places, 313 transitions, 4080 flow [2025-03-17 14:31:36,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:31:36,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:31:36,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 337 transitions. [2025-03-17 14:31:36,877 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.7020833333333333 [2025-03-17 14:31:36,877 INFO L175 Difference]: Start difference. First operand has 197 places, 201 transitions, 2136 flow. Second operand 6 states and 337 transitions. [2025-03-17 14:31:36,877 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 202 places, 313 transitions, 4080 flow [2025-03-17 14:31:36,985 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 201 places, 313 transitions, 4024 flow, removed 4 selfloop flow, removed 1 redundant places. [2025-03-17 14:31:36,988 INFO L231 Difference]: Finished difference. Result has 204 places, 234 transitions, 2747 flow [2025-03-17 14:31:36,990 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=2100, PETRI_DIFFERENCE_MINUEND_PLACES=196, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=201, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=17, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=160, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=2747, PETRI_PLACES=204, PETRI_TRANSITIONS=234} [2025-03-17 14:31:36,991 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 125 predicate places. [2025-03-17 14:31:36,991 INFO L471 AbstractCegarLoop]: Abstraction has has 204 places, 234 transitions, 2747 flow [2025-03-17 14:31:36,991 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 49.0) internal successors, (294), 6 states have internal predecessors, (294), 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) [2025-03-17 14:31:36,991 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:36,991 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:36,991 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2025-03-17 14:31:36,992 INFO L396 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:36,992 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:36,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1506385660, now seen corresponding path program 4 times [2025-03-17 14:31:36,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:36,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003191436] [2025-03-17 14:31:36,992 INFO L95 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2025-03-17 14:31:36,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:37,000 INFO L108 AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST partitioned 34 statements into 2 equivalence classes. [2025-03-17 14:31:37,004 INFO L111 AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 1 check-sat command(s) and asserted 29 of 34 statements. [2025-03-17 14:31:37,004 INFO L114 AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 1 check-sat command(s) [2025-03-17 14:31:37,004 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:37,034 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2025-03-17 14:31:37,034 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:37,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003191436] [2025-03-17 14:31:37,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003191436] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:37,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622717234] [2025-03-17 14:31:37,034 INFO L95 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2025-03-17 14:31:37,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:37,034 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:37,036 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:37,037 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2025-03-17 14:31:37,103 INFO L108 AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST partitioned 34 statements into 2 equivalence classes. [2025-03-17 14:31:37,115 INFO L111 AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 1 check-sat command(s) and asserted 29 of 34 statements. [2025-03-17 14:31:37,115 INFO L114 AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 1 check-sat command(s) [2025-03-17 14:31:37,115 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:37,116 INFO L256 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 6 conjuncts are in the unsatisfiable core [2025-03-17 14:31:37,117 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:37,146 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2025-03-17 14:31:37,146 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:37,169 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2025-03-17 14:31:37,169 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622717234] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:37,169 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:37,169 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2025-03-17 14:31:37,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909735476] [2025-03-17 14:31:37,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:37,169 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2025-03-17 14:31:37,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:37,170 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2025-03-17 14:31:37,170 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2025-03-17 14:31:37,240 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 42 out of 80 [2025-03-17 14:31:37,241 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 204 places, 234 transitions, 2747 flow. Second operand has 10 states, 10 states have (on average 45.7) internal successors, (457), 10 states have internal predecessors, (457), 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) [2025-03-17 14:31:37,241 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:37,241 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 42 of 80 [2025-03-17 14:31:37,241 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:39,705 INFO L124 PetriNetUnfolderBase]: 10636/19716 cut-off events. [2025-03-17 14:31:39,705 INFO L125 PetriNetUnfolderBase]: For 164747/166244 co-relation queries the response was YES. [2025-03-17 14:31:39,766 INFO L83 FinitePrefix]: Finished finitePrefix Result has 103908 conditions, 19716 events. 10636/19716 cut-off events. For 164747/166244 co-relation queries the response was YES. Maximal size of possible extension queue 457. Compared 154962 event pairs, 219 based on Foata normal form. 493/20118 useless extension candidates. Maximal degree in co-relation 102824. Up to 2963 conditions per place. [2025-03-17 14:31:39,831 INFO L140 encePairwiseOnDemand]: 69/80 looper letters, 565 selfloop transitions, 493 changer transitions 4/1087 dead transitions. [2025-03-17 14:31:39,831 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 230 places, 1087 transitions, 15459 flow [2025-03-17 14:31:39,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2025-03-17 14:31:39,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2025-03-17 14:31:39,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 1350 transitions. [2025-03-17 14:31:39,833 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.625 [2025-03-17 14:31:39,833 INFO L175 Difference]: Start difference. First operand has 204 places, 234 transitions, 2747 flow. Second operand 27 states and 1350 transitions. [2025-03-17 14:31:39,833 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 230 places, 1087 transitions, 15459 flow [2025-03-17 14:31:40,334 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 230 places, 1087 transitions, 15171 flow, removed 144 selfloop flow, removed 0 redundant places. [2025-03-17 14:31:40,342 INFO L231 Difference]: Finished difference. Result has 242 places, 694 transitions, 9387 flow [2025-03-17 14:31:40,343 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=2715, PETRI_DIFFERENCE_MINUEND_PLACES=204, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=234, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=61, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=156, PETRI_DIFFERENCE_SUBTRAHEND_STATES=27, PETRI_FLOW=9387, PETRI_PLACES=242, PETRI_TRANSITIONS=694} [2025-03-17 14:31:40,344 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 163 predicate places. [2025-03-17 14:31:40,344 INFO L471 AbstractCegarLoop]: Abstraction has has 242 places, 694 transitions, 9387 flow [2025-03-17 14:31:40,344 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 45.7) internal successors, (457), 10 states have internal predecessors, (457), 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) [2025-03-17 14:31:40,344 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:40,344 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:40,350 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2025-03-17 14:31:40,545 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2025-03-17 14:31:40,545 INFO L396 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:40,546 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:40,546 INFO L85 PathProgramCache]: Analyzing trace with hash -467661326, now seen corresponding path program 5 times [2025-03-17 14:31:40,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:40,546 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282181906] [2025-03-17 14:31:40,546 INFO L95 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2025-03-17 14:31:40,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:40,554 INFO L108 AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 partitioned 34 statements into 3 equivalence classes. [2025-03-17 14:31:40,560 INFO L111 AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) and asserted 34 of 34 statements. [2025-03-17 14:31:40,560 INFO L114 AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2025-03-17 14:31:40,560 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:40,616 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:31:40,616 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:40,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282181906] [2025-03-17 14:31:40,616 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282181906] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:40,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745772778] [2025-03-17 14:31:40,616 INFO L95 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2025-03-17 14:31:40,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:40,616 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:40,619 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:40,620 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2025-03-17 14:31:40,685 INFO L108 AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 partitioned 34 statements into 3 equivalence classes. [2025-03-17 14:31:40,707 INFO L111 AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) and asserted 34 of 34 statements. [2025-03-17 14:31:40,707 INFO L114 AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2025-03-17 14:31:40,707 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:40,708 INFO L256 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-03-17 14:31:40,709 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:40,744 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:31:40,744 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:40,782 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:31:40,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745772778] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:40,782 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:31:40,782 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 13 [2025-03-17 14:31:40,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913364405] [2025-03-17 14:31:40,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:31:40,783 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:31:40,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:40,783 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:31:40,783 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2025-03-17 14:31:40,825 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 43 out of 80 [2025-03-17 14:31:40,826 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 242 places, 694 transitions, 9387 flow. Second operand has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 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) [2025-03-17 14:31:40,826 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:40,826 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 43 of 80 [2025-03-17 14:31:40,826 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:43,293 INFO L124 PetriNetUnfolderBase]: 9157/16984 cut-off events. [2025-03-17 14:31:43,293 INFO L125 PetriNetUnfolderBase]: For 206523/209154 co-relation queries the response was YES. [2025-03-17 14:31:43,377 INFO L83 FinitePrefix]: Finished finitePrefix Result has 103948 conditions, 16984 events. 9157/16984 cut-off events. For 206523/209154 co-relation queries the response was YES. Maximal size of possible extension queue 457. Compared 132545 event pairs, 1272 based on Foata normal form. 568/17070 useless extension candidates. Maximal degree in co-relation 103063. Up to 4318 conditions per place. [2025-03-17 14:31:43,471 INFO L140 encePairwiseOnDemand]: 70/80 looper letters, 342 selfloop transitions, 545 changer transitions 0/922 dead transitions. [2025-03-17 14:31:43,472 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 250 places, 922 transitions, 14215 flow [2025-03-17 14:31:43,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2025-03-17 14:31:43,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2025-03-17 14:31:43,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 473 transitions. [2025-03-17 14:31:43,474 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6569444444444444 [2025-03-17 14:31:43,474 INFO L175 Difference]: Start difference. First operand has 242 places, 694 transitions, 9387 flow. Second operand 9 states and 473 transitions. [2025-03-17 14:31:43,475 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 250 places, 922 transitions, 14215 flow [2025-03-17 14:31:44,291 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 249 places, 922 transitions, 14085 flow, removed 32 selfloop flow, removed 1 redundant places. [2025-03-17 14:31:44,303 INFO L231 Difference]: Finished difference. Result has 253 places, 831 transitions, 12824 flow [2025-03-17 14:31:44,303 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=9302, PETRI_DIFFERENCE_MINUEND_PLACES=241, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=694, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=418, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=237, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=12824, PETRI_PLACES=253, PETRI_TRANSITIONS=831} [2025-03-17 14:31:44,304 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 174 predicate places. [2025-03-17 14:31:44,304 INFO L471 AbstractCegarLoop]: Abstraction has has 253 places, 831 transitions, 12824 flow [2025-03-17 14:31:44,304 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 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) [2025-03-17 14:31:44,304 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:44,304 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:44,310 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2025-03-17 14:31:44,505 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2025-03-17 14:31:44,505 INFO L396 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:44,506 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:44,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1004333706, now seen corresponding path program 6 times [2025-03-17 14:31:44,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:44,506 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209640492] [2025-03-17 14:31:44,506 INFO L95 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2025-03-17 14:31:44,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:44,515 INFO L108 AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE partitioned 34 statements into 3 equivalence classes. [2025-03-17 14:31:44,519 INFO L111 AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE issued 1 check-sat command(s) and asserted 21 of 34 statements. [2025-03-17 14:31:44,519 INFO L114 AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE issued 1 check-sat command(s) [2025-03-17 14:31:44,519 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:44,556 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:31:44,556 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:44,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209640492] [2025-03-17 14:31:44,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209640492] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:31:44,556 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:31:44,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2025-03-17 14:31:44,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794130251] [2025-03-17 14:31:44,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:31:44,557 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-03-17 14:31:44,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:44,557 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-03-17 14:31:44,557 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2025-03-17 14:31:44,592 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:31:44,593 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 253 places, 831 transitions, 12824 flow. Second operand has 6 states, 6 states have (on average 49.0) internal successors, (294), 6 states have internal predecessors, (294), 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) [2025-03-17 14:31:44,593 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:44,593 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:31:44,593 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:47,135 INFO L124 PetriNetUnfolderBase]: 8684/16216 cut-off events. [2025-03-17 14:31:47,135 INFO L125 PetriNetUnfolderBase]: For 253841/256666 co-relation queries the response was YES. [2025-03-17 14:31:47,222 INFO L83 FinitePrefix]: Finished finitePrefix Result has 107560 conditions, 16216 events. 8684/16216 cut-off events. For 253841/256666 co-relation queries the response was YES. Maximal size of possible extension queue 444. Compared 128096 event pairs, 2441 based on Foata normal form. 453/15937 useless extension candidates. Maximal degree in co-relation 106671. Up to 8197 conditions per place. [2025-03-17 14:31:47,295 INFO L140 encePairwiseOnDemand]: 73/80 looper letters, 606 selfloop transitions, 232 changer transitions 17/1002 dead transitions. [2025-03-17 14:31:47,295 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 258 places, 1002 transitions, 16938 flow [2025-03-17 14:31:47,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:31:47,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:31:47,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 336 transitions. [2025-03-17 14:31:47,296 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.7 [2025-03-17 14:31:47,296 INFO L175 Difference]: Start difference. First operand has 253 places, 831 transitions, 12824 flow. Second operand 6 states and 336 transitions. [2025-03-17 14:31:47,296 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 258 places, 1002 transitions, 16938 flow [2025-03-17 14:31:48,655 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 254 places, 1002 transitions, 16709 flow, removed 104 selfloop flow, removed 4 redundant places. [2025-03-17 14:31:48,667 INFO L231 Difference]: Finished difference. Result has 255 places, 850 transitions, 13526 flow [2025-03-17 14:31:48,668 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=12635, PETRI_DIFFERENCE_MINUEND_PLACES=249, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=831, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=213, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=618, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=13526, PETRI_PLACES=255, PETRI_TRANSITIONS=850} [2025-03-17 14:31:48,670 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 176 predicate places. [2025-03-17 14:31:48,670 INFO L471 AbstractCegarLoop]: Abstraction has has 255 places, 850 transitions, 13526 flow [2025-03-17 14:31:48,670 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 49.0) internal successors, (294), 6 states have internal predecessors, (294), 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) [2025-03-17 14:31:48,670 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:48,670 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:48,670 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2025-03-17 14:31:48,671 INFO L396 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:48,671 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:48,672 INFO L85 PathProgramCache]: Analyzing trace with hash 753459186, now seen corresponding path program 7 times [2025-03-17 14:31:48,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:48,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868811975] [2025-03-17 14:31:48,672 INFO L95 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2025-03-17 14:31:48,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:48,683 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 34 statements into 1 equivalence classes. [2025-03-17 14:31:48,692 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 34 of 34 statements. [2025-03-17 14:31:48,695 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:48,696 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:48,773 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:31:48,774 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:48,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868811975] [2025-03-17 14:31:48,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868811975] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:48,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699776590] [2025-03-17 14:31:48,774 INFO L95 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2025-03-17 14:31:48,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:48,774 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:48,776 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:48,778 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2025-03-17 14:31:48,854 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 34 statements into 1 equivalence classes. [2025-03-17 14:31:48,879 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 34 of 34 statements. [2025-03-17 14:31:48,879 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:31:48,879 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:48,882 INFO L256 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-03-17 14:31:48,883 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:48,946 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:31:48,946 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:49,002 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 14:31:49,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699776590] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:49,003 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:31:49,003 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8, 6] total 16 [2025-03-17 14:31:49,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243245291] [2025-03-17 14:31:49,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:31:49,003 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:31:49,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:49,003 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:31:49,003 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2025-03-17 14:31:49,050 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 43 out of 80 [2025-03-17 14:31:49,050 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 255 places, 850 transitions, 13526 flow. Second operand has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 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) [2025-03-17 14:31:49,050 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:49,050 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 43 of 80 [2025-03-17 14:31:49,050 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:51,908 INFO L124 PetriNetUnfolderBase]: 9974/18242 cut-off events. [2025-03-17 14:31:51,908 INFO L125 PetriNetUnfolderBase]: For 270584/273796 co-relation queries the response was YES. [2025-03-17 14:31:51,987 INFO L83 FinitePrefix]: Finished finitePrefix Result has 118402 conditions, 18242 events. 9974/18242 cut-off events. For 270584/273796 co-relation queries the response was YES. Maximal size of possible extension queue 493. Compared 142443 event pairs, 1277 based on Foata normal form. 860/18579 useless extension candidates. Maximal degree in co-relation 117738. Up to 3526 conditions per place. [2025-03-17 14:31:52,092 INFO L140 encePairwiseOnDemand]: 70/80 looper letters, 342 selfloop transitions, 651 changer transitions 2/1030 dead transitions. [2025-03-17 14:31:52,092 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 262 places, 1030 transitions, 17736 flow [2025-03-17 14:31:52,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 14:31:52,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2025-03-17 14:31:52,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 429 transitions. [2025-03-17 14:31:52,093 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.6703125 [2025-03-17 14:31:52,093 INFO L175 Difference]: Start difference. First operand has 255 places, 850 transitions, 13526 flow. Second operand 8 states and 429 transitions. [2025-03-17 14:31:52,093 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 262 places, 1030 transitions, 17736 flow [2025-03-17 14:31:53,584 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 259 places, 1030 transitions, 17271 flow, removed 1 selfloop flow, removed 3 redundant places. [2025-03-17 14:31:53,599 INFO L231 Difference]: Finished difference. Result has 261 places, 940 transitions, 16312 flow [2025-03-17 14:31:53,599 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=80, PETRI_DIFFERENCE_MINUEND_FLOW=13061, PETRI_DIFFERENCE_MINUEND_PLACES=252, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=850, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=561, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=250, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=16312, PETRI_PLACES=261, PETRI_TRANSITIONS=940} [2025-03-17 14:31:53,600 INFO L279 CegarLoopForPetriNet]: 79 programPoint places, 182 predicate places. [2025-03-17 14:31:53,600 INFO L471 AbstractCegarLoop]: Abstraction has has 261 places, 940 transitions, 16312 flow [2025-03-17 14:31:53,600 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 47.285714285714285) internal successors, (331), 7 states have internal predecessors, (331), 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) [2025-03-17 14:31:53,600 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:31:53,600 INFO L206 CegarLoopForPetriNet]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:31:53,606 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2025-03-17 14:31:53,800 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2025-03-17 14:31:53,801 INFO L396 AbstractCegarLoop]: === Iteration 41 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 50 more)] === [2025-03-17 14:31:53,801 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:31:53,801 INFO L85 PathProgramCache]: Analyzing trace with hash -2135665290, now seen corresponding path program 2 times [2025-03-17 14:31:53,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:31:53,801 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141070427] [2025-03-17 14:31:53,802 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:53,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:31:53,810 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 36 statements into 2 equivalence classes. [2025-03-17 14:31:53,837 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 36 of 36 statements. [2025-03-17 14:31:53,837 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:31:53,837 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:53,978 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:53,978 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:31:53,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141070427] [2025-03-17 14:31:53,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141070427] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:31:53,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179542018] [2025-03-17 14:31:53,979 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:31:53,979 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:31:53,979 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:31:53,981 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 14:31:53,983 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2025-03-17 14:31:54,065 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 36 statements into 2 equivalence classes. [2025-03-17 14:31:54,117 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 36 of 36 statements. [2025-03-17 14:31:54,117 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:31:54,117 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:31:54,118 INFO L256 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 11 conjuncts are in the unsatisfiable core [2025-03-17 14:31:54,120 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:31:54,226 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:54,226 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:31:54,300 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:31:54,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179542018] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:31:54,300 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:31:54,300 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2025-03-17 14:31:54,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000712466] [2025-03-17 14:31:54,300 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:31:54,300 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2025-03-17 14:31:54,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:31:54,301 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2025-03-17 14:31:54,301 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2025-03-17 14:31:54,488 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 80 [2025-03-17 14:31:54,489 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 261 places, 940 transitions, 16312 flow. Second operand has 21 states, 21 states have (on average 46.333333333333336) internal successors, (973), 21 states have internal predecessors, (973), 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) [2025-03-17 14:31:54,489 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:31:54,489 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 80 [2025-03-17 14:31:54,489 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:31:57,529 INFO L124 PetriNetUnfolderBase]: 8728/15881 cut-off events. [2025-03-17 14:31:57,529 INFO L125 PetriNetUnfolderBase]: For 285575/288404 co-relation queries the response was YES. [2025-03-17 14:31:57,637 INFO L83 FinitePrefix]: Finished finitePrefix Result has 110697 conditions, 15881 events. 8728/15881 cut-off events. For 285575/288404 co-relation queries the response was YES. Maximal size of possible extension queue 425. Compared 120921 event pairs, 2272 based on Foata normal form. 370/15587 useless extension candidates. Maximal degree in co-relation 110051. Up to 4652 conditions per place. [2025-03-17 14:31:57,713 INFO L140 encePairwiseOnDemand]: 63/80 looper letters, 868 selfloop transitions, 206 changer transitions 4/1238 dead transitions. [2025-03-17 14:31:57,713 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 274 places, 1238 transitions, 22890 flow [2025-03-17 14:31:57,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2025-03-17 14:31:57,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2025-03-17 14:31:57,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 856 transitions. [2025-03-17 14:31:57,714 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.66875 [2025-03-17 14:31:57,714 INFO L175 Difference]: Start difference. First operand has 261 places, 940 transitions, 16312 flow. Second operand 16 states and 856 transitions. [2025-03-17 14:31:57,714 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 274 places, 1238 transitions, 22890 flow