./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/weaver/popl20-three-array-sum.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-three-array-sum.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 c1d27b7f98ac68d2da6120346c107c87df7f6f708200f0d5d2c806741122116e --- Real Ultimate output --- This is Ultimate 0.3.0-?-8fc3dc6-m [2025-03-17 14:32:40,900 INFO L188 SettingsManager]: Resetting all preferences to default values... [2025-03-17 14:32:40,952 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2025-03-17 14:32:40,957 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2025-03-17 14:32:40,957 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2025-03-17 14:32:40,980 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2025-03-17 14:32:40,980 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2025-03-17 14:32:40,981 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2025-03-17 14:32:40,981 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2025-03-17 14:32:40,981 INFO L153 SettingsManager]: * Use memory slicer=true [2025-03-17 14:32:40,982 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2025-03-17 14:32:40,982 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * Use SBE=true [2025-03-17 14:32:40,982 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * sizeof long=4 [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * sizeof POINTER=4 [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2025-03-17 14:32:40,982 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * sizeof long double=12 [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Use constant arrays=true [2025-03-17 14:32:40,983 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 14:32:40,983 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2025-03-17 14:32:40,983 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2025-03-17 14:32:40,983 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 -> c1d27b7f98ac68d2da6120346c107c87df7f6f708200f0d5d2c806741122116e [2025-03-17 14:32:41,179 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2025-03-17 14:32:41,186 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2025-03-17 14:32:41,187 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2025-03-17 14:32:41,188 INFO L270 PluginConnector]: Initializing CDTParser... [2025-03-17 14:32:41,188 INFO L274 PluginConnector]: CDTParser initialized [2025-03-17 14:32:41,188 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/weaver/popl20-three-array-sum.wvr.c [2025-03-17 14:32:42,302 INFO L533 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c14970107/2540d522d3244d6ba604f8e1ac5b1c2d/FLAG17b0fa744 [2025-03-17 14:32:42,511 INFO L384 CDTParser]: Found 1 translation units. [2025-03-17 14:32:42,512 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/weaver/popl20-three-array-sum.wvr.c [2025-03-17 14:32:42,518 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c14970107/2540d522d3244d6ba604f8e1ac5b1c2d/FLAG17b0fa744 [2025-03-17 14:32:42,532 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c14970107/2540d522d3244d6ba604f8e1ac5b1c2d [2025-03-17 14:32:42,534 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2025-03-17 14:32:42,535 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2025-03-17 14:32:42,535 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2025-03-17 14:32:42,536 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2025-03-17 14:32:42,538 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2025-03-17 14:32:42,539 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,539 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@af8af9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42, skipping insertion in model container [2025-03-17 14:32:42,539 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,553 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-03-17 14:32:42,668 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 14:32:42,669 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 14:32:42,675 INFO L200 MainTranslator]: Completed pre-run [2025-03-17 14:32:42,694 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 14:32:42,703 INFO L204 MainTranslator]: Completed translation [2025-03-17 14:32:42,704 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42 WrapperNode [2025-03-17 14:32:42,704 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2025-03-17 14:32:42,704 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2025-03-17 14:32:42,704 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2025-03-17 14:32:42,704 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2025-03-17 14:32:42,709 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,715 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,729 INFO L138 Inliner]: procedures = 25, calls = 30, calls flagged for inlining = 9, calls inlined = 13, statements flattened = 131 [2025-03-17 14:32:42,729 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2025-03-17 14:32:42,730 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2025-03-17 14:32:42,730 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2025-03-17 14:32:42,730 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2025-03-17 14:32:42,736 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,736 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,738 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,748 INFO L175 MemorySlicer]: Split 11 memory accesses to 2 slices as follows [2, 9]. 82 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0]. The 4 writes are split as follows [0, 4]. [2025-03-17 14:32:42,748 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,749 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,753 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,753 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,754 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,755 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,756 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2025-03-17 14:32:42,757 INFO L112 PluginConnector]: ------------------------IcfgBuilder---------------------------- [2025-03-17 14:32:42,757 INFO L270 PluginConnector]: Initializing IcfgBuilder... [2025-03-17 14:32:42,757 INFO L274 PluginConnector]: IcfgBuilder initialized [2025-03-17 14:32:42,757 INFO L184 PluginConnector]: Executing the observer IcfgBuilderObserver from plugin IcfgBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (1/1) ... [2025-03-17 14:32:42,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 14:32:42,770 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:32:42,781 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 14:32:42,784 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 14:32:42,800 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2025-03-17 14:32:42,800 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2025-03-17 14:32:42,801 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2025-03-17 14:32:42,801 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2025-03-17 14:32:42,801 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2025-03-17 14:32:42,801 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2025-03-17 14:32:42,801 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2025-03-17 14:32:42,802 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 14:32:42,894 INFO L256 CfgBuilder]: Building ICFG [2025-03-17 14:32:42,895 INFO L286 CfgBuilder]: Building CFG for each procedure with an implementation [2025-03-17 14:32:43,228 INFO L303 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2025-03-17 14:32:43,229 INFO L307 CfgBuilder]: Performing block encoding [2025-03-17 14:32:43,397 INFO L331 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2025-03-17 14:32:43,397 INFO L336 CfgBuilder]: Removed 0 assume(true) statements. [2025-03-17 14:32:43,398 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.03 02:32:43 BoogieIcfgContainer [2025-03-17 14:32:43,398 INFO L131 PluginConnector]: ------------------------ END IcfgBuilder---------------------------- [2025-03-17 14:32:43,401 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2025-03-17 14:32:43,401 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2025-03-17 14:32:43,404 INFO L274 PluginConnector]: TraceAbstraction initialized [2025-03-17 14:32:43,404 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.03 02:32:42" (1/3) ... [2025-03-17 14:32:43,405 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f167c53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 02:32:43, skipping insertion in model container [2025-03-17 14:32:43,405 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:32:42" (2/3) ... [2025-03-17 14:32:43,405 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f167c53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 02:32:43, skipping insertion in model container [2025-03-17 14:32:43,405 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.03 02:32:43" (3/3) ... [2025-03-17 14:32:43,406 INFO L128 eAbstractionObserver]: Analyzing ICFG popl20-three-array-sum.wvr.c [2025-03-17 14:32:43,417 INFO L216 ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2025-03-17 14:32:43,418 INFO L151 ceAbstractionStarter]: Applying trace abstraction to ICFG popl20-three-array-sum.wvr.c that has 4 procedures, 58 locations, 1 initial locations, 6 loop locations, and 20 error locations. [2025-03-17 14:32:43,419 INFO L491 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2025-03-17 14:32:43,493 INFO L143 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2025-03-17 14:32:43,523 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 67 places, 64 transitions, 149 flow [2025-03-17 14:32:43,555 INFO L124 PetriNetUnfolderBase]: 7/61 cut-off events. [2025-03-17 14:32:43,557 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2025-03-17 14:32:43,560 INFO L83 FinitePrefix]: Finished finitePrefix Result has 74 conditions, 61 events. 7/61 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 143 event pairs, 0 based on Foata normal form. 0/34 useless extension candidates. Maximal degree in co-relation 44. Up to 2 conditions per place. [2025-03-17 14:32:43,560 INFO L82 GeneralOperation]: Start removeDead. Operand has 67 places, 64 transitions, 149 flow [2025-03-17 14:32:43,563 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 63 places, 60 transitions, 138 flow [2025-03-17 14:32:43,572 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-03-17 14:32:43,580 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;@7a965405, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-03-17 14:32:43,580 INFO L334 AbstractCegarLoop]: Starting to check reachability of 35 error locations. [2025-03-17 14:32:43,582 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2025-03-17 14:32:43,582 INFO L124 PetriNetUnfolderBase]: 1/4 cut-off events. [2025-03-17 14:32:43,582 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2025-03-17 14:32:43,582 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:43,583 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2025-03-17 14:32:43,583 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:43,589 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:43,590 INFO L85 PathProgramCache]: Analyzing trace with hash 526165, now seen corresponding path program 1 times [2025-03-17 14:32:43,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:43,595 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117911089] [2025-03-17 14:32:43,595 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:43,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:43,648 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 3 statements into 1 equivalence classes. [2025-03-17 14:32:43,666 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 3 of 3 statements. [2025-03-17 14:32:43,667 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:43,667 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:43,781 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 14:32:43,781 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:43,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117911089] [2025-03-17 14:32:43,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1117911089] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:32:43,782 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:32:43,782 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2025-03-17 14:32:43,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406640008] [2025-03-17 14:32:43,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:43,789 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2025-03-17 14:32:43,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:43,805 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2025-03-17 14:32:43,805 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2025-03-17 14:32:43,819 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 64 [2025-03-17 14:32:43,821 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 60 transitions, 138 flow. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 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 14:32:43,821 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:43,821 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 64 [2025-03-17 14:32:43,822 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:44,208 INFO L124 PetriNetUnfolderBase]: 1809/2811 cut-off events. [2025-03-17 14:32:44,209 INFO L125 PetriNetUnfolderBase]: For 238/238 co-relation queries the response was YES. [2025-03-17 14:32:44,215 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5449 conditions, 2811 events. 1809/2811 cut-off events. For 238/238 co-relation queries the response was YES. Maximal size of possible extension queue 236. Compared 16033 event pairs, 1402 based on Foata normal form. 1/2098 useless extension candidates. Maximal degree in co-relation 4853. Up to 2456 conditions per place. [2025-03-17 14:32:44,230 INFO L140 encePairwiseOnDemand]: 58/64 looper letters, 39 selfloop transitions, 2 changer transitions 0/55 dead transitions. [2025-03-17 14:32:44,232 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 55 transitions, 210 flow [2025-03-17 14:32:44,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2025-03-17 14:32:44,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2025-03-17 14:32:44,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2025-03-17 14:32:44,241 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.515625 [2025-03-17 14:32:44,243 INFO L175 Difference]: Start difference. First operand has 63 places, 60 transitions, 138 flow. Second operand 3 states and 99 transitions. [2025-03-17 14:32:44,243 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 55 transitions, 210 flow [2025-03-17 14:32:44,246 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 55 transitions, 198 flow, removed 0 selfloop flow, removed 6 redundant places. [2025-03-17 14:32:44,248 INFO L231 Difference]: Finished difference. Result has 54 places, 55 transitions, 120 flow [2025-03-17 14:32:44,250 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=116, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=120, PETRI_PLACES=54, PETRI_TRANSITIONS=55} [2025-03-17 14:32:44,253 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, -9 predicate places. [2025-03-17 14:32:44,253 INFO L471 AbstractCegarLoop]: Abstraction has has 54 places, 55 transitions, 120 flow [2025-03-17 14:32:44,254 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 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 14:32:44,254 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:44,254 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2025-03-17 14:32:44,254 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2025-03-17 14:32:44,255 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:44,255 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:44,255 INFO L85 PathProgramCache]: Analyzing trace with hash 526166, now seen corresponding path program 1 times [2025-03-17 14:32:44,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:44,255 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350302154] [2025-03-17 14:32:44,256 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:44,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:44,263 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 3 statements into 1 equivalence classes. [2025-03-17 14:32:44,283 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 3 of 3 statements. [2025-03-17 14:32:44,285 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:44,285 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:44,498 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 14:32:44,499 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:44,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350302154] [2025-03-17 14:32:44,499 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350302154] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:32:44,499 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:32:44,499 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-03-17 14:32:44,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064951691] [2025-03-17 14:32:44,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:44,500 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-17 14:32:44,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:44,500 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-17 14:32:44,501 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-17 14:32:44,529 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 64 [2025-03-17 14:32:44,529 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 55 transitions, 120 flow. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 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 14:32:44,530 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:44,530 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 64 [2025-03-17 14:32:44,530 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:44,816 INFO L124 PetriNetUnfolderBase]: 1810/2814 cut-off events. [2025-03-17 14:32:44,816 INFO L125 PetriNetUnfolderBase]: For 61/61 co-relation queries the response was YES. [2025-03-17 14:32:44,820 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5334 conditions, 2814 events. 1810/2814 cut-off events. For 61/61 co-relation queries the response was YES. Maximal size of possible extension queue 236. Compared 16032 event pairs, 1402 based on Foata normal form. 0/2097 useless extension candidates. Maximal degree in co-relation 5297. Up to 2469 conditions per place. [2025-03-17 14:32:44,832 INFO L140 encePairwiseOnDemand]: 59/64 looper letters, 43 selfloop transitions, 4 changer transitions 0/58 dead transitions. [2025-03-17 14:32:44,832 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 58 transitions, 220 flow [2025-03-17 14:32:44,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-03-17 14:32:44,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-03-17 14:32:44,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 120 transitions. [2025-03-17 14:32:44,833 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.46875 [2025-03-17 14:32:44,833 INFO L175 Difference]: Start difference. First operand has 54 places, 55 transitions, 120 flow. Second operand 4 states and 120 transitions. [2025-03-17 14:32:44,833 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 58 transitions, 220 flow [2025-03-17 14:32:44,834 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 58 transitions, 216 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-03-17 14:32:44,835 INFO L231 Difference]: Finished difference. Result has 57 places, 58 transitions, 143 flow [2025-03-17 14:32:44,835 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=116, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=143, PETRI_PLACES=57, PETRI_TRANSITIONS=58} [2025-03-17 14:32:44,836 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, -6 predicate places. [2025-03-17 14:32:44,836 INFO L471 AbstractCegarLoop]: Abstraction has has 57 places, 58 transitions, 143 flow [2025-03-17 14:32:44,836 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 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 14:32:44,836 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:44,836 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2025-03-17 14:32:44,836 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2025-03-17 14:32:44,837 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:44,837 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:44,837 INFO L85 PathProgramCache]: Analyzing trace with hash 16311733, now seen corresponding path program 1 times [2025-03-17 14:32:44,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:44,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144679957] [2025-03-17 14:32:44,837 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:44,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:44,843 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 4 statements into 1 equivalence classes. [2025-03-17 14:32:44,847 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 4 of 4 statements. [2025-03-17 14:32:44,847 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:44,847 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:44,957 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 14:32:44,957 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:44,957 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144679957] [2025-03-17 14:32:44,957 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144679957] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:32:44,957 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:32:44,957 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 14:32:44,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345145186] [2025-03-17 14:32:44,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:44,958 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-17 14:32:44,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:44,958 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-17 14:32:44,959 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-17 14:32:44,972 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 21 out of 64 [2025-03-17 14:32:44,973 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 57 places, 58 transitions, 143 flow. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 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 14:32:44,973 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:44,973 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 21 of 64 [2025-03-17 14:32:44,973 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:45,258 INFO L124 PetriNetUnfolderBase]: 1812/2824 cut-off events. [2025-03-17 14:32:45,258 INFO L125 PetriNetUnfolderBase]: For 61/61 co-relation queries the response was YES. [2025-03-17 14:32:45,260 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5360 conditions, 2824 events. 1812/2824 cut-off events. For 61/61 co-relation queries the response was YES. Maximal size of possible extension queue 236. Compared 16094 event pairs, 1402 based on Foata normal form. 0/2108 useless extension candidates. Maximal degree in co-relation 5308. Up to 2467 conditions per place. [2025-03-17 14:32:45,267 INFO L140 encePairwiseOnDemand]: 55/64 looper letters, 42 selfloop transitions, 10 changer transitions 0/66 dead transitions. [2025-03-17 14:32:45,268 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 66 transitions, 263 flow [2025-03-17 14:32:45,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-03-17 14:32:45,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-03-17 14:32:45,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 138 transitions. [2025-03-17 14:32:45,269 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5390625 [2025-03-17 14:32:45,269 INFO L175 Difference]: Start difference. First operand has 57 places, 58 transitions, 143 flow. Second operand 4 states and 138 transitions. [2025-03-17 14:32:45,269 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 66 transitions, 263 flow [2025-03-17 14:32:45,269 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 66 transitions, 260 flow, removed 0 selfloop flow, removed 1 redundant places. [2025-03-17 14:32:45,270 INFO L231 Difference]: Finished difference. Result has 61 places, 64 transitions, 196 flow [2025-03-17 14:32:45,270 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=140, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=50, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=196, PETRI_PLACES=61, PETRI_TRANSITIONS=64} [2025-03-17 14:32:45,271 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, -2 predicate places. [2025-03-17 14:32:45,271 INFO L471 AbstractCegarLoop]: Abstraction has has 61 places, 64 transitions, 196 flow [2025-03-17 14:32:45,271 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 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 14:32:45,271 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:45,271 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1] [2025-03-17 14:32:45,271 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2025-03-17 14:32:45,271 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:45,271 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:45,271 INFO L85 PathProgramCache]: Analyzing trace with hash 505661401, now seen corresponding path program 1 times [2025-03-17 14:32:45,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:45,271 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702564807] [2025-03-17 14:32:45,272 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:45,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:45,276 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-03-17 14:32:45,284 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-03-17 14:32:45,286 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:45,286 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:45,488 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 14:32:45,489 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:45,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702564807] [2025-03-17 14:32:45,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [702564807] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:32:45,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275191974] [2025-03-17 14:32:45,489 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:45,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:32:45,490 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:32:45,492 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 14:32:45,494 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 14:32:45,531 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 5 statements into 1 equivalence classes. [2025-03-17 14:32:45,539 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 5 of 5 statements. [2025-03-17 14:32:45,539 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:45,539 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:45,541 INFO L256 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 16 conjuncts are in the unsatisfiable core [2025-03-17 14:32:45,544 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:32:45,585 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 14:32:45,738 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 14:32:45,738 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:32:45,807 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 14:32:45,807 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275191974] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:32:45,808 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:32:45,808 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2025-03-17 14:32:45,808 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156431743] [2025-03-17 14:32:45,808 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:32:45,808 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2025-03-17 14:32:45,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:45,808 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2025-03-17 14:32:45,808 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2025-03-17 14:32:45,879 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 64 [2025-03-17 14:32:45,880 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 64 transitions, 196 flow. Second operand has 11 states, 11 states have (on average 19.363636363636363) internal successors, (213), 11 states have internal predecessors, (213), 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 14:32:45,880 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:45,880 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 64 [2025-03-17 14:32:45,880 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:46,193 INFO L124 PetriNetUnfolderBase]: 1813/2826 cut-off events. [2025-03-17 14:32:46,193 INFO L125 PetriNetUnfolderBase]: For 64/64 co-relation queries the response was YES. [2025-03-17 14:32:46,196 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5397 conditions, 2826 events. 1813/2826 cut-off events. For 64/64 co-relation queries the response was YES. Maximal size of possible extension queue 236. Compared 16102 event pairs, 1402 based on Foata normal form. 0/2115 useless extension candidates. Maximal degree in co-relation 5313. Up to 2476 conditions per place. [2025-03-17 14:32:46,208 INFO L140 encePairwiseOnDemand]: 59/64 looper letters, 45 selfloop transitions, 10 changer transitions 0/66 dead transitions. [2025-03-17 14:32:46,209 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 67 places, 66 transitions, 317 flow [2025-03-17 14:32:46,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 14:32:46,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2025-03-17 14:32:46,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 195 transitions. [2025-03-17 14:32:46,210 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.380859375 [2025-03-17 14:32:46,210 INFO L175 Difference]: Start difference. First operand has 61 places, 64 transitions, 196 flow. Second operand 8 states and 195 transitions. [2025-03-17 14:32:46,210 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 67 places, 66 transitions, 317 flow [2025-03-17 14:32:46,211 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 67 places, 66 transitions, 317 flow, removed 0 selfloop flow, removed 0 redundant places. [2025-03-17 14:32:46,212 INFO L231 Difference]: Finished difference. Result has 67 places, 66 transitions, 227 flow [2025-03-17 14:32:46,212 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=192, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=63, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=56, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=227, PETRI_PLACES=67, PETRI_TRANSITIONS=66} [2025-03-17 14:32:46,212 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 4 predicate places. [2025-03-17 14:32:46,212 INFO L471 AbstractCegarLoop]: Abstraction has has 67 places, 66 transitions, 227 flow [2025-03-17 14:32:46,212 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 19.363636363636363) internal successors, (213), 11 states have internal predecessors, (213), 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 14:32:46,213 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:46,213 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2025-03-17 14:32:46,219 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2025-03-17 14:32:46,417 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 14:32:46,417 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:46,418 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:46,418 INFO L85 PathProgramCache]: Analyzing trace with hash -1504365166, now seen corresponding path program 1 times [2025-03-17 14:32:46,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:46,418 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19651792] [2025-03-17 14:32:46,418 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:46,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:46,423 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 6 statements into 1 equivalence classes. [2025-03-17 14:32:46,428 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 6 of 6 statements. [2025-03-17 14:32:46,428 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:46,428 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:46,578 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 14:32:46,578 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:46,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19651792] [2025-03-17 14:32:46,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19651792] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:32:46,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596232659] [2025-03-17 14:32:46,578 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:46,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:32:46,578 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:32:46,583 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 14:32:46,584 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 14:32:46,627 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 6 statements into 1 equivalence classes. [2025-03-17 14:32:46,639 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 6 of 6 statements. [2025-03-17 14:32:46,639 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:46,639 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:46,640 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 21 conjuncts are in the unsatisfiable core [2025-03-17 14:32:46,641 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:32:46,655 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 14:32:46,734 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:32:46,734 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 14:32:46,753 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 14:32:46,753 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:32:46,806 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 14:32:46,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596232659] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:32:46,806 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:32:46,806 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 3] total 10 [2025-03-17 14:32:46,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50836869] [2025-03-17 14:32:46,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:46,806 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:32:46,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:46,807 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:32:46,807 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2025-03-17 14:32:46,843 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 64 [2025-03-17 14:32:46,844 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 67 places, 66 transitions, 227 flow. Second operand has 5 states, 5 states have (on average 19.2) internal successors, (96), 5 states have internal predecessors, (96), 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 14:32:46,844 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:46,844 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 64 [2025-03-17 14:32:46,844 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:47,237 INFO L124 PetriNetUnfolderBase]: 3618/5623 cut-off events. [2025-03-17 14:32:47,238 INFO L125 PetriNetUnfolderBase]: For 125/125 co-relation queries the response was YES. [2025-03-17 14:32:47,244 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10705 conditions, 5623 events. 3618/5623 cut-off events. For 125/125 co-relation queries the response was YES. Maximal size of possible extension queue 404. Compared 35610 event pairs, 2804 based on Foata normal form. 2/4218 useless extension candidates. Maximal degree in co-relation 5354. Up to 2470 conditions per place. [2025-03-17 14:32:47,264 INFO L140 encePairwiseOnDemand]: 55/64 looper letters, 79 selfloop transitions, 10 changer transitions 0/100 dead transitions. [2025-03-17 14:32:47,265 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 71 places, 100 transitions, 486 flow [2025-03-17 14:32:47,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 14:32:47,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-17 14:32:47,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 177 transitions. [2025-03-17 14:32:47,266 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.553125 [2025-03-17 14:32:47,266 INFO L175 Difference]: Start difference. First operand has 67 places, 66 transitions, 227 flow. Second operand 5 states and 177 transitions. [2025-03-17 14:32:47,266 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 71 places, 100 transitions, 486 flow [2025-03-17 14:32:47,267 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 100 transitions, 444 flow, removed 6 selfloop flow, removed 7 redundant places. [2025-03-17 14:32:47,268 INFO L231 Difference]: Finished difference. Result has 65 places, 67 transitions, 221 flow [2025-03-17 14:32:47,268 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=185, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=66, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=221, PETRI_PLACES=65, PETRI_TRANSITIONS=67} [2025-03-17 14:32:47,269 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 2 predicate places. [2025-03-17 14:32:47,269 INFO L471 AbstractCegarLoop]: Abstraction has has 65 places, 67 transitions, 221 flow [2025-03-17 14:32:47,269 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.2) internal successors, (96), 5 states have internal predecessors, (96), 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 14:32:47,269 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:47,269 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:32:47,275 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2025-03-17 14:32:47,470 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 14:32:47,470 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:47,470 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:47,470 INFO L85 PathProgramCache]: Analyzing trace with hash 1860011134, now seen corresponding path program 1 times [2025-03-17 14:32:47,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:47,470 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684622611] [2025-03-17 14:32:47,470 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:47,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:47,476 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-03-17 14:32:47,481 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-03-17 14:32:47,481 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:47,481 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:47,538 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 14:32:47,538 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:47,538 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684622611] [2025-03-17 14:32:47,538 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684622611] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:32:47,538 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:32:47,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-03-17 14:32:47,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222144523] [2025-03-17 14:32:47,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:47,539 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:32:47,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:47,539 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:32:47,539 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:32:47,554 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:32:47,555 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 67 transitions, 221 flow. Second operand has 5 states, 5 states have (on average 21.4) internal successors, (107), 5 states have internal predecessors, (107), 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 14:32:47,555 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:47,555 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:32:47,555 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:48,008 INFO L124 PetriNetUnfolderBase]: 4727/7412 cut-off events. [2025-03-17 14:32:48,009 INFO L125 PetriNetUnfolderBase]: For 198/198 co-relation queries the response was YES. [2025-03-17 14:32:48,016 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14176 conditions, 7412 events. 4727/7412 cut-off events. For 198/198 co-relation queries the response was YES. Maximal size of possible extension queue 396. Compared 47248 event pairs, 2780 based on Foata normal form. 0/5331 useless extension candidates. Maximal degree in co-relation 6514. Up to 3021 conditions per place. [2025-03-17 14:32:48,036 INFO L140 encePairwiseOnDemand]: 54/64 looper letters, 94 selfloop transitions, 14 changer transitions 0/120 dead transitions. [2025-03-17 14:32:48,036 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 70 places, 120 transitions, 555 flow [2025-03-17 14:32:48,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:32:48,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:32:48,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 225 transitions. [2025-03-17 14:32:48,037 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5859375 [2025-03-17 14:32:48,037 INFO L175 Difference]: Start difference. First operand has 65 places, 67 transitions, 221 flow. Second operand 6 states and 225 transitions. [2025-03-17 14:32:48,038 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 70 places, 120 transitions, 555 flow [2025-03-17 14:32:48,039 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 120 transitions, 553 flow, removed 0 selfloop flow, removed 1 redundant places. [2025-03-17 14:32:48,040 INFO L231 Difference]: Finished difference. Result has 71 places, 69 transitions, 264 flow [2025-03-17 14:32:48,040 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=219, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=264, PETRI_PLACES=71, PETRI_TRANSITIONS=69} [2025-03-17 14:32:48,041 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 8 predicate places. [2025-03-17 14:32:48,041 INFO L471 AbstractCegarLoop]: Abstraction has has 71 places, 69 transitions, 264 flow [2025-03-17 14:32:48,041 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 5 states have internal predecessors, (107), 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 14:32:48,041 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:48,041 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2025-03-17 14:32:48,041 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2025-03-17 14:32:48,041 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:48,042 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:48,042 INFO L85 PathProgramCache]: Analyzing trace with hash 1709070282, now seen corresponding path program 1 times [2025-03-17 14:32:48,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:48,042 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613223726] [2025-03-17 14:32:48,042 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:48,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:48,048 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-03-17 14:32:48,052 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-03-17 14:32:48,054 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:48,054 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:48,139 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2025-03-17 14:32:48,139 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:48,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613223726] [2025-03-17 14:32:48,139 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613223726] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:32:48,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914793019] [2025-03-17 14:32:48,139 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:48,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:32:48,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:32:48,141 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 14:32:48,143 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 14:32:48,183 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 8 statements into 1 equivalence classes. [2025-03-17 14:32:48,195 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 8 of 8 statements. [2025-03-17 14:32:48,196 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:48,196 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:48,199 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 10 conjuncts are in the unsatisfiable core [2025-03-17 14:32:48,199 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:32:48,257 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2025-03-17 14:32:48,261 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:32:48,311 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2025-03-17 14:32:48,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914793019] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:32:48,311 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:32:48,311 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2025-03-17 14:32:48,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561614041] [2025-03-17 14:32:48,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:32:48,312 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2025-03-17 14:32:48,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:48,312 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2025-03-17 14:32:48,312 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2025-03-17 14:32:48,386 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 21 out of 64 [2025-03-17 14:32:48,387 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 71 places, 69 transitions, 264 flow. Second operand has 13 states, 13 states have (on average 22.53846153846154) internal successors, (293), 13 states have internal predecessors, (293), 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 14:32:48,387 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:48,387 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 21 of 64 [2025-03-17 14:32:48,387 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:49,069 INFO L124 PetriNetUnfolderBase]: 6184/10413 cut-off events. [2025-03-17 14:32:49,069 INFO L125 PetriNetUnfolderBase]: For 2659/2839 co-relation queries the response was YES. [2025-03-17 14:32:49,079 INFO L83 FinitePrefix]: Finished finitePrefix Result has 21380 conditions, 10413 events. 6184/10413 cut-off events. For 2659/2839 co-relation queries the response was YES. Maximal size of possible extension queue 445. Compared 75225 event pairs, 5030 based on Foata normal form. 2/7600 useless extension candidates. Maximal degree in co-relation 6752. Up to 6096 conditions per place. [2025-03-17 14:32:49,100 INFO L140 encePairwiseOnDemand]: 54/64 looper letters, 74 selfloop transitions, 29 changer transitions 0/116 dead transitions. [2025-03-17 14:32:49,101 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 116 transitions, 641 flow [2025-03-17 14:32:49,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2025-03-17 14:32:49,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2025-03-17 14:32:49,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 291 transitions. [2025-03-17 14:32:49,102 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5052083333333334 [2025-03-17 14:32:49,102 INFO L175 Difference]: Start difference. First operand has 71 places, 69 transitions, 264 flow. Second operand 9 states and 291 transitions. [2025-03-17 14:32:49,102 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 116 transitions, 641 flow [2025-03-17 14:32:49,109 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 116 transitions, 620 flow, removed 0 selfloop flow, removed 2 redundant places. [2025-03-17 14:32:49,110 INFO L231 Difference]: Finished difference. Result has 79 places, 81 transitions, 410 flow [2025-03-17 14:32:49,110 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=250, PETRI_DIFFERENCE_MINUEND_PLACES=69, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=18, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=49, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=410, PETRI_PLACES=79, PETRI_TRANSITIONS=81} [2025-03-17 14:32:49,111 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 16 predicate places. [2025-03-17 14:32:49,111 INFO L471 AbstractCegarLoop]: Abstraction has has 79 places, 81 transitions, 410 flow [2025-03-17 14:32:49,111 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 22.53846153846154) internal successors, (293), 13 states have internal predecessors, (293), 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 14:32:49,111 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:49,111 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:32:49,117 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 14:32:49,315 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:32:49,315 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting thread2Err4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:49,315 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:49,315 INFO L85 PathProgramCache]: Analyzing trace with hash 713652683, now seen corresponding path program 1 times [2025-03-17 14:32:49,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:49,315 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643951230] [2025-03-17 14:32:49,315 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:49,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:49,320 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 10 statements into 1 equivalence classes. [2025-03-17 14:32:49,324 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 10 of 10 statements. [2025-03-17 14:32:49,324 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:49,324 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:49,381 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 14:32:49,381 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:49,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643951230] [2025-03-17 14:32:49,381 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643951230] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:32:49,381 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:32:49,381 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-03-17 14:32:49,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152368955] [2025-03-17 14:32:49,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:49,382 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:32:49,382 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:49,382 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:32:49,382 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:32:49,396 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:32:49,397 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 81 transitions, 410 flow. Second operand has 5 states, 5 states have (on average 22.0) internal successors, (110), 5 states have internal predecessors, (110), 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 14:32:49,397 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:49,397 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:32:49,397 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:49,783 INFO L124 PetriNetUnfolderBase]: 4712/7149 cut-off events. [2025-03-17 14:32:49,783 INFO L125 PetriNetUnfolderBase]: For 1630/2008 co-relation queries the response was YES. [2025-03-17 14:32:49,791 INFO L83 FinitePrefix]: Finished finitePrefix Result has 15215 conditions, 7149 events. 4712/7149 cut-off events. For 1630/2008 co-relation queries the response was YES. Maximal size of possible extension queue 259. Compared 39359 event pairs, 3554 based on Foata normal form. 0/5551 useless extension candidates. Maximal degree in co-relation 6261. Up to 5611 conditions per place. [2025-03-17 14:32:49,807 INFO L140 encePairwiseOnDemand]: 54/64 looper letters, 83 selfloop transitions, 20 changer transitions 0/115 dead transitions. [2025-03-17 14:32:49,808 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 84 places, 115 transitions, 712 flow [2025-03-17 14:32:49,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:32:49,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:32:49,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 208 transitions. [2025-03-17 14:32:49,809 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5416666666666666 [2025-03-17 14:32:49,809 INFO L175 Difference]: Start difference. First operand has 79 places, 81 transitions, 410 flow. Second operand 6 states and 208 transitions. [2025-03-17 14:32:49,809 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 84 places, 115 transitions, 712 flow [2025-03-17 14:32:49,811 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 115 transitions, 631 flow, removed 9 selfloop flow, removed 5 redundant places. [2025-03-17 14:32:49,812 INFO L231 Difference]: Finished difference. Result has 81 places, 83 transitions, 387 flow [2025-03-17 14:32:49,812 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=329, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=81, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=18, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=387, PETRI_PLACES=81, PETRI_TRANSITIONS=83} [2025-03-17 14:32:49,813 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 18 predicate places. [2025-03-17 14:32:49,813 INFO L471 AbstractCegarLoop]: Abstraction has has 81 places, 83 transitions, 387 flow [2025-03-17 14:32:49,813 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 22.0) internal successors, (110), 5 states have internal predecessors, (110), 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 14:32:49,813 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:49,813 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1] [2025-03-17 14:32:49,813 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2025-03-17 14:32:49,813 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:49,813 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:49,813 INFO L85 PathProgramCache]: Analyzing trace with hash 1655009575, now seen corresponding path program 2 times [2025-03-17 14:32:49,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:49,814 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365912473] [2025-03-17 14:32:49,814 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:32:49,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:49,819 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 10 statements into 2 equivalence classes. [2025-03-17 14:32:49,828 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 10 of 10 statements. [2025-03-17 14:32:49,828 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:32:49,828 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:49,943 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 14:32:49,944 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:49,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365912473] [2025-03-17 14:32:49,944 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1365912473] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:32:49,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090964224] [2025-03-17 14:32:49,944 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:32:49,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:32:49,945 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:32:49,946 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 14:32:49,948 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 14:32:49,982 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 10 statements into 2 equivalence classes. [2025-03-17 14:32:49,994 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 10 of 10 statements. [2025-03-17 14:32:49,995 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:32:49,995 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:49,995 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 26 conjuncts are in the unsatisfiable core [2025-03-17 14:32:49,996 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:32:50,009 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 14:32:50,107 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:32:50,107 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 23 treesize of output 20 [2025-03-17 14:32:50,214 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2025-03-17 14:32:50,214 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:32:50,407 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 14:32:50,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090964224] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:32:50,407 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:32:50,407 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6] total 16 [2025-03-17 14:32:50,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862814848] [2025-03-17 14:32:50,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:32:50,407 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2025-03-17 14:32:50,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:50,408 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2025-03-17 14:32:50,408 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2025-03-17 14:32:50,738 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 64 [2025-03-17 14:32:50,739 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 81 places, 83 transitions, 387 flow. Second operand has 18 states, 18 states have (on average 19.555555555555557) internal successors, (352), 18 states have internal predecessors, (352), 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 14:32:50,739 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:50,739 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 64 [2025-03-17 14:32:50,739 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:52,210 INFO L124 PetriNetUnfolderBase]: 6321/9829 cut-off events. [2025-03-17 14:32:52,211 INFO L125 PetriNetUnfolderBase]: For 2856/3408 co-relation queries the response was YES. [2025-03-17 14:32:52,220 INFO L83 FinitePrefix]: Finished finitePrefix Result has 21585 conditions, 9829 events. 6321/9829 cut-off events. For 2856/3408 co-relation queries the response was YES. Maximal size of possible extension queue 286. Compared 57385 event pairs, 5126 based on Foata normal form. 16/7589 useless extension candidates. Maximal degree in co-relation 8145. Up to 6301 conditions per place. [2025-03-17 14:32:52,240 INFO L140 encePairwiseOnDemand]: 52/64 looper letters, 74 selfloop transitions, 78 changer transitions 0/163 dead transitions. [2025-03-17 14:32:52,241 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 99 places, 163 transitions, 1086 flow [2025-03-17 14:32:52,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2025-03-17 14:32:52,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2025-03-17 14:32:52,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 533 transitions. [2025-03-17 14:32:52,243 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.39657738095238093 [2025-03-17 14:32:52,243 INFO L175 Difference]: Start difference. First operand has 81 places, 83 transitions, 387 flow. Second operand 21 states and 533 transitions. [2025-03-17 14:32:52,243 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 99 places, 163 transitions, 1086 flow [2025-03-17 14:32:52,248 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 95 places, 163 transitions, 1007 flow, removed 0 selfloop flow, removed 4 redundant places. [2025-03-17 14:32:52,250 INFO L231 Difference]: Finished difference. Result has 98 places, 130 transitions, 815 flow [2025-03-17 14:32:52,250 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=335, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=81, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=29, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=50, PETRI_DIFFERENCE_SUBTRAHEND_STATES=21, PETRI_FLOW=815, PETRI_PLACES=98, PETRI_TRANSITIONS=130} [2025-03-17 14:32:52,251 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 35 predicate places. [2025-03-17 14:32:52,251 INFO L471 AbstractCegarLoop]: Abstraction has has 98 places, 130 transitions, 815 flow [2025-03-17 14:32:52,251 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 19.555555555555557) internal successors, (352), 18 states have internal predecessors, (352), 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 14:32:52,251 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:52,251 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:32:52,257 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2025-03-17 14:32:52,452 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:32:52,452 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting thread3Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:52,452 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:52,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1174009612, now seen corresponding path program 1 times [2025-03-17 14:32:52,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:52,452 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914354388] [2025-03-17 14:32:52,453 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:52,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:52,458 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 14 statements into 1 equivalence classes. [2025-03-17 14:32:52,463 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 14 of 14 statements. [2025-03-17 14:32:52,463 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:52,463 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:52,543 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 14:32:52,543 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:52,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914354388] [2025-03-17 14:32:52,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914354388] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:32:52,544 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:32:52,544 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 14:32:52,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074590188] [2025-03-17 14:32:52,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:52,544 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-17 14:32:52,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:52,544 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-17 14:32:52,545 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-17 14:32:52,555 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 64 [2025-03-17 14:32:52,555 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 98 places, 130 transitions, 815 flow. Second operand has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 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 14:32:52,555 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:52,555 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 64 [2025-03-17 14:32:52,555 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:52,915 INFO L124 PetriNetUnfolderBase]: 5188/8096 cut-off events. [2025-03-17 14:32:52,915 INFO L125 PetriNetUnfolderBase]: For 2404/2794 co-relation queries the response was YES. [2025-03-17 14:32:52,928 INFO L83 FinitePrefix]: Finished finitePrefix Result has 18091 conditions, 8096 events. 5188/8096 cut-off events. For 2404/2794 co-relation queries the response was YES. Maximal size of possible extension queue 243. Compared 45398 event pairs, 4214 based on Foata normal form. 0/6558 useless extension candidates. Maximal degree in co-relation 12974. Up to 7207 conditions per place. [2025-03-17 14:32:52,948 INFO L140 encePairwiseOnDemand]: 60/64 looper letters, 102 selfloop transitions, 15 changer transitions 0/128 dead transitions. [2025-03-17 14:32:52,949 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 99 places, 128 transitions, 1045 flow [2025-03-17 14:32:52,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-03-17 14:32:52,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2025-03-17 14:32:52,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 113 transitions. [2025-03-17 14:32:52,950 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.44140625 [2025-03-17 14:32:52,950 INFO L175 Difference]: Start difference. First operand has 98 places, 130 transitions, 815 flow. Second operand 4 states and 113 transitions. [2025-03-17 14:32:52,950 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 99 places, 128 transitions, 1045 flow [2025-03-17 14:32:52,957 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 95 places, 128 transitions, 912 flow, removed 14 selfloop flow, removed 4 redundant places. [2025-03-17 14:32:52,958 INFO L231 Difference]: Finished difference. Result has 95 places, 128 transitions, 708 flow [2025-03-17 14:32:52,958 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=678, PETRI_DIFFERENCE_MINUEND_PLACES=92, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=128, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=15, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=113, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=708, PETRI_PLACES=95, PETRI_TRANSITIONS=128} [2025-03-17 14:32:52,959 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 32 predicate places. [2025-03-17 14:32:52,959 INFO L471 AbstractCegarLoop]: Abstraction has has 95 places, 128 transitions, 708 flow [2025-03-17 14:32:52,959 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 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 14:32:52,959 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:52,959 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:32:52,959 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2025-03-17 14:32:52,959 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:52,961 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:52,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1174009611, now seen corresponding path program 1 times [2025-03-17 14:32:52,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:52,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762525195] [2025-03-17 14:32:52,961 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:52,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:52,966 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 14 statements into 1 equivalence classes. [2025-03-17 14:32:52,973 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 14 of 14 statements. [2025-03-17 14:32:52,975 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:52,975 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:53,019 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 14:32:53,019 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:53,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762525195] [2025-03-17 14:32:53,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762525195] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:32:53,019 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:32:53,019 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-03-17 14:32:53,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442951253] [2025-03-17 14:32:53,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:53,020 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:32:53,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:53,020 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:32:53,020 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:32:53,037 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:32:53,037 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 95 places, 128 transitions, 708 flow. Second operand has 5 states, 5 states have (on average 22.6) internal successors, (113), 5 states have internal predecessors, (113), 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 14:32:53,037 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:53,037 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:32:53,037 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:53,417 INFO L124 PetriNetUnfolderBase]: 5029/7673 cut-off events. [2025-03-17 14:32:53,417 INFO L125 PetriNetUnfolderBase]: For 1821/2430 co-relation queries the response was YES. [2025-03-17 14:32:53,427 INFO L83 FinitePrefix]: Finished finitePrefix Result has 16545 conditions, 7673 events. 5029/7673 cut-off events. For 1821/2430 co-relation queries the response was YES. Maximal size of possible extension queue 227. Compared 42565 event pairs, 3814 based on Foata normal form. 0/5831 useless extension candidates. Maximal degree in co-relation 11281. Up to 6694 conditions per place. [2025-03-17 14:32:53,445 INFO L140 encePairwiseOnDemand]: 55/64 looper letters, 108 selfloop transitions, 31 changer transitions 0/149 dead transitions. [2025-03-17 14:32:53,445 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 100 places, 149 transitions, 1072 flow [2025-03-17 14:32:53,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 14:32:53,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2025-03-17 14:32:53,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 195 transitions. [2025-03-17 14:32:53,446 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5078125 [2025-03-17 14:32:53,446 INFO L175 Difference]: Start difference. First operand has 95 places, 128 transitions, 708 flow. Second operand 6 states and 195 transitions. [2025-03-17 14:32:53,446 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 100 places, 149 transitions, 1072 flow [2025-03-17 14:32:53,451 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 98 places, 149 transitions, 1040 flow, removed 8 selfloop flow, removed 2 redundant places. [2025-03-17 14:32:53,452 INFO L231 Difference]: Finished difference. Result has 100 places, 129 transitions, 759 flow [2025-03-17 14:32:53,452 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=684, PETRI_DIFFERENCE_MINUEND_PLACES=93, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=128, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=30, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=97, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=759, PETRI_PLACES=100, PETRI_TRANSITIONS=129} [2025-03-17 14:32:53,452 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 37 predicate places. [2025-03-17 14:32:53,453 INFO L471 AbstractCegarLoop]: Abstraction has has 100 places, 129 transitions, 759 flow [2025-03-17 14:32:53,453 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 22.6) internal successors, (113), 5 states have internal predecessors, (113), 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 14:32:53,453 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:53,453 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:32:53,453 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2025-03-17 14:32:53,453 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:53,453 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:53,453 INFO L85 PathProgramCache]: Analyzing trace with hash -1193940237, now seen corresponding path program 1 times [2025-03-17 14:32:53,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:53,453 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969003906] [2025-03-17 14:32:53,453 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:53,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:53,458 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 14 statements into 1 equivalence classes. [2025-03-17 14:32:53,465 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 14 of 14 statements. [2025-03-17 14:32:53,467 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:53,467 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:53,549 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:32:53,550 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:53,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969003906] [2025-03-17 14:32:53,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969003906] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:32:53,551 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:32:53,551 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 14:32:53,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996305462] [2025-03-17 14:32:53,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:53,551 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:32:53,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:53,551 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:32:53,552 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:32:53,573 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 17 out of 64 [2025-03-17 14:32:53,573 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 100 places, 129 transitions, 759 flow. Second operand has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 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 14:32:53,573 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:53,573 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 17 of 64 [2025-03-17 14:32:53,573 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:53,874 INFO L124 PetriNetUnfolderBase]: 3964/6440 cut-off events. [2025-03-17 14:32:53,874 INFO L125 PetriNetUnfolderBase]: For 1810/2269 co-relation queries the response was YES. [2025-03-17 14:32:53,883 INFO L83 FinitePrefix]: Finished finitePrefix Result has 14089 conditions, 6440 events. 3964/6440 cut-off events. For 1810/2269 co-relation queries the response was YES. Maximal size of possible extension queue 223. Compared 37447 event pairs, 2974 based on Foata normal form. 0/5234 useless extension candidates. Maximal degree in co-relation 9665. Up to 5363 conditions per place. [2025-03-17 14:32:53,895 INFO L140 encePairwiseOnDemand]: 59/64 looper letters, 95 selfloop transitions, 22 changer transitions 0/127 dead transitions. [2025-03-17 14:32:53,895 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 102 places, 127 transitions, 989 flow [2025-03-17 14:32:53,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 14:32:53,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-17 14:32:53,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 125 transitions. [2025-03-17 14:32:53,896 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.390625 [2025-03-17 14:32:53,896 INFO L175 Difference]: Start difference. First operand has 100 places, 129 transitions, 759 flow. Second operand 5 states and 125 transitions. [2025-03-17 14:32:53,896 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 102 places, 127 transitions, 989 flow [2025-03-17 14:32:53,902 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 99 places, 127 transitions, 934 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-03-17 14:32:53,904 INFO L231 Difference]: Finished difference. Result has 99 places, 127 transitions, 744 flow [2025-03-17 14:32:53,904 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=700, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=127, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=22, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=105, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=744, PETRI_PLACES=99, PETRI_TRANSITIONS=127} [2025-03-17 14:32:53,904 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 36 predicate places. [2025-03-17 14:32:53,904 INFO L471 AbstractCegarLoop]: Abstraction has has 99 places, 127 transitions, 744 flow [2025-03-17 14:32:53,904 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 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 14:32:53,905 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:32:53,905 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:32:53,905 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2025-03-17 14:32:53,905 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:32:53,905 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:32:53,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1193940236, now seen corresponding path program 1 times [2025-03-17 14:32:53,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:32:53,905 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367292793] [2025-03-17 14:32:53,905 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:53,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:32:53,910 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 14 statements into 1 equivalence classes. [2025-03-17 14:32:53,916 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 14 of 14 statements. [2025-03-17 14:32:53,916 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:53,916 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:54,165 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2025-03-17 14:32:54,165 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:32:54,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367292793] [2025-03-17 14:32:54,166 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367292793] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:32:54,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051857052] [2025-03-17 14:32:54,166 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:32:54,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:32:54,166 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:32:54,168 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 14:32:54,170 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 14:32:54,209 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 14 statements into 1 equivalence classes. [2025-03-17 14:32:54,224 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 14 of 14 statements. [2025-03-17 14:32:54,224 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:32:54,224 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:32:54,225 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 37 conjuncts are in the unsatisfiable core [2025-03-17 14:32:54,226 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:32:54,233 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 14:32:54,238 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 14:32:54,270 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:32:54,271 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 18 treesize of output 17 [2025-03-17 14:32:54,286 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2025-03-17 14:32:54,286 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 14:32:54,366 INFO L349 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2025-03-17 14:32:54,366 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 28 treesize of output 32 [2025-03-17 14:32:54,644 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:32:54,644 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:32:54,918 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:32:54,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051857052] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:32:54,919 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:32:54,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5] total 15 [2025-03-17 14:32:54,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762702049] [2025-03-17 14:32:54,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:32:54,919 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:32:54,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:32:54,919 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:32:54,919 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2025-03-17 14:32:55,047 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:32:55,048 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 99 places, 127 transitions, 744 flow. Second operand has 7 states, 7 states have (on average 21.857142857142858) internal successors, (153), 7 states have internal predecessors, (153), 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 14:32:55,048 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:32:55,048 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:32:55,048 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:32:56,739 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:32:58,046 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:32:59,445 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:33:00,714 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:33:02,016 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:33:03,469 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:33:04,954 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:33:06,623 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.52s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:33:06,937 INFO L124 PetriNetUnfolderBase]: 6409/9906 cut-off events. [2025-03-17 14:33:06,938 INFO L125 PetriNetUnfolderBase]: For 2598/3381 co-relation queries the response was YES. [2025-03-17 14:33:06,953 INFO L83 FinitePrefix]: Finished finitePrefix Result has 21988 conditions, 9906 events. 6409/9906 cut-off events. For 2598/3381 co-relation queries the response was YES. Maximal size of possible extension queue 304. Compared 57843 event pairs, 2603 based on Foata normal form. 0/7800 useless extension candidates. Maximal degree in co-relation 15166. Up to 5653 conditions per place. [2025-03-17 14:33:06,974 INFO L140 encePairwiseOnDemand]: 54/64 looper letters, 125 selfloop transitions, 34 changer transitions 0/168 dead transitions. [2025-03-17 14:33:06,975 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 105 places, 168 transitions, 1198 flow [2025-03-17 14:33:06,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:33:06,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:33:06,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 221 transitions. [2025-03-17 14:33:06,976 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.49330357142857145 [2025-03-17 14:33:06,976 INFO L175 Difference]: Start difference. First operand has 99 places, 127 transitions, 744 flow. Second operand 7 states and 221 transitions. [2025-03-17 14:33:06,976 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 105 places, 168 transitions, 1198 flow [2025-03-17 14:33:06,982 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 102 places, 168 transitions, 1168 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-03-17 14:33:06,983 INFO L231 Difference]: Finished difference. Result has 104 places, 131 transitions, 834 flow [2025-03-17 14:33:06,983 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=714, PETRI_DIFFERENCE_MINUEND_PLACES=96, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=127, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=30, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=93, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=834, PETRI_PLACES=104, PETRI_TRANSITIONS=131} [2025-03-17 14:33:06,984 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 41 predicate places. [2025-03-17 14:33:06,984 INFO L471 AbstractCegarLoop]: Abstraction has has 104 places, 131 transitions, 834 flow [2025-03-17 14:33:06,984 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 21.857142857142858) internal successors, (153), 7 states have internal predecessors, (153), 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 14:33:06,984 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:06,984 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:06,990 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2025-03-17 14:33:07,184 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,SelfDestructingSolverStorable12 [2025-03-17 14:33:07,184 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:07,185 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:07,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1642558900, now seen corresponding path program 1 times [2025-03-17 14:33:07,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:07,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202609570] [2025-03-17 14:33:07,185 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:07,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:07,190 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 15 statements into 1 equivalence classes. [2025-03-17 14:33:07,195 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 15 of 15 statements. [2025-03-17 14:33:07,195 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:07,195 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:07,342 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:07,342 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:07,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202609570] [2025-03-17 14:33:07,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202609570] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:07,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270495399] [2025-03-17 14:33:07,343 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:07,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:07,343 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:07,345 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 14:33:07,346 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 14:33:07,389 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 15 statements into 1 equivalence classes. [2025-03-17 14:33:07,410 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 15 of 15 statements. [2025-03-17 14:33:07,410 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:07,410 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:07,411 INFO L256 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 16 conjuncts are in the unsatisfiable core [2025-03-17 14:33:07,413 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:07,417 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 14:33:07,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 14:33:07,458 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 14:33:07,467 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2025-03-17 14:33:07,467 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 14:33:07,512 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:07,513 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:07,593 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 52 treesize of output 48 [2025-03-17 14:33:07,649 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:07,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270495399] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:07,650 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:07,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2025-03-17 14:33:07,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838088414] [2025-03-17 14:33:07,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:07,650 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2025-03-17 14:33:07,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:07,651 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2025-03-17 14:33:07,651 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2025-03-17 14:33:11,671 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:33:15,697 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2025-03-17 14:33:15,822 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 64 [2025-03-17 14:33:15,822 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 104 places, 131 transitions, 834 flow. Second operand has 13 states, 13 states have (on average 17.46153846153846) internal successors, (227), 13 states have internal predecessors, (227), 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 14:33:15,822 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:15,822 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 64 [2025-03-17 14:33:15,822 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:16,706 INFO L124 PetriNetUnfolderBase]: 9163/13872 cut-off events. [2025-03-17 14:33:16,706 INFO L125 PetriNetUnfolderBase]: For 12279/13845 co-relation queries the response was YES. [2025-03-17 14:33:16,726 INFO L83 FinitePrefix]: Finished finitePrefix Result has 34859 conditions, 13872 events. 9163/13872 cut-off events. For 12279/13845 co-relation queries the response was YES. Maximal size of possible extension queue 383. Compared 82119 event pairs, 4073 based on Foata normal form. 0/11088 useless extension candidates. Maximal degree in co-relation 23799. Up to 8611 conditions per place. [2025-03-17 14:33:16,762 INFO L140 encePairwiseOnDemand]: 53/64 looper letters, 122 selfloop transitions, 41 changer transitions 0/171 dead transitions. [2025-03-17 14:33:16,762 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 111 places, 171 transitions, 1294 flow [2025-03-17 14:33:16,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 14:33:16,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2025-03-17 14:33:16,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 210 transitions. [2025-03-17 14:33:16,763 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.41015625 [2025-03-17 14:33:16,763 INFO L175 Difference]: Start difference. First operand has 104 places, 131 transitions, 834 flow. Second operand 8 states and 210 transitions. [2025-03-17 14:33:16,763 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 111 places, 171 transitions, 1294 flow [2025-03-17 14:33:16,772 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 110 places, 171 transitions, 1291 flow, removed 0 selfloop flow, removed 1 redundant places. [2025-03-17 14:33:16,774 INFO L231 Difference]: Finished difference. Result has 111 places, 132 transitions, 928 flow [2025-03-17 14:33:16,774 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=831, PETRI_DIFFERENCE_MINUEND_PLACES=103, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=131, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=40, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=90, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=928, PETRI_PLACES=111, PETRI_TRANSITIONS=132} [2025-03-17 14:33:16,774 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 48 predicate places. [2025-03-17 14:33:16,774 INFO L471 AbstractCegarLoop]: Abstraction has has 111 places, 132 transitions, 928 flow [2025-03-17 14:33:16,774 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 17.46153846153846) internal successors, (227), 13 states have internal predecessors, (227), 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 14:33:16,774 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:16,774 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:16,781 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 14:33:16,975 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 14:33:16,975 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:16,975 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:16,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1642558899, now seen corresponding path program 1 times [2025-03-17 14:33:16,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:16,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311900737] [2025-03-17 14:33:16,975 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:16,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:16,981 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 15 statements into 1 equivalence classes. [2025-03-17 14:33:16,986 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 15 of 15 statements. [2025-03-17 14:33:16,986 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:16,986 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:17,037 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2025-03-17 14:33:17,037 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:17,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311900737] [2025-03-17 14:33:17,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311900737] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:33:17,037 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:33:17,037 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-03-17 14:33:17,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751172204] [2025-03-17 14:33:17,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:33:17,037 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 14:33:17,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:17,037 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 14:33:17,037 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2025-03-17 14:33:17,072 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 17 out of 64 [2025-03-17 14:33:17,072 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 111 places, 132 transitions, 928 flow. Second operand has 5 states, 5 states have (on average 19.8) internal successors, (99), 5 states have internal predecessors, (99), 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 14:33:17,072 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:17,072 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 17 of 64 [2025-03-17 14:33:17,072 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:17,596 INFO L124 PetriNetUnfolderBase]: 5440/8811 cut-off events. [2025-03-17 14:33:17,596 INFO L125 PetriNetUnfolderBase]: For 17637/18894 co-relation queries the response was YES. [2025-03-17 14:33:17,610 INFO L83 FinitePrefix]: Finished finitePrefix Result has 25147 conditions, 8811 events. 5440/8811 cut-off events. For 17637/18894 co-relation queries the response was YES. Maximal size of possible extension queue 245. Compared 53174 event pairs, 3995 based on Foata normal form. 600/8049 useless extension candidates. Maximal degree in co-relation 17353. Up to 7289 conditions per place. [2025-03-17 14:33:17,632 INFO L140 encePairwiseOnDemand]: 59/64 looper letters, 95 selfloop transitions, 26 changer transitions 0/130 dead transitions. [2025-03-17 14:33:17,632 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 113 places, 130 transitions, 1166 flow [2025-03-17 14:33:17,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 14:33:17,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2025-03-17 14:33:17,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 124 transitions. [2025-03-17 14:33:17,633 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.3875 [2025-03-17 14:33:17,633 INFO L175 Difference]: Start difference. First operand has 111 places, 132 transitions, 928 flow. Second operand 5 states and 124 transitions. [2025-03-17 14:33:17,633 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 113 places, 130 transitions, 1166 flow [2025-03-17 14:33:17,641 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 108 places, 130 transitions, 1111 flow, removed 0 selfloop flow, removed 5 redundant places. [2025-03-17 14:33:17,643 INFO L231 Difference]: Finished difference. Result has 108 places, 130 transitions, 921 flow [2025-03-17 14:33:17,643 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=869, PETRI_DIFFERENCE_MINUEND_PLACES=104, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=130, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=26, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=104, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=921, PETRI_PLACES=108, PETRI_TRANSITIONS=130} [2025-03-17 14:33:17,643 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 45 predicate places. [2025-03-17 14:33:17,643 INFO L471 AbstractCegarLoop]: Abstraction has has 108 places, 130 transitions, 921 flow [2025-03-17 14:33:17,643 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.8) internal successors, (99), 5 states have internal predecessors, (99), 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 14:33:17,643 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:17,644 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:17,644 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2025-03-17 14:33:17,644 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:17,644 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:17,644 INFO L85 PathProgramCache]: Analyzing trace with hash -670951675, now seen corresponding path program 1 times [2025-03-17 14:33:17,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:17,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875924789] [2025-03-17 14:33:17,644 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:17,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:17,650 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 16 statements into 1 equivalence classes. [2025-03-17 14:33:17,654 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 16 of 16 statements. [2025-03-17 14:33:17,654 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:17,654 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:17,746 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:17,746 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:17,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875924789] [2025-03-17 14:33:17,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875924789] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:17,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703587859] [2025-03-17 14:33:17,746 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:17,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:17,746 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:17,748 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 14:33:17,750 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 14:33:17,792 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 16 statements into 1 equivalence classes. [2025-03-17 14:33:17,810 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 16 of 16 statements. [2025-03-17 14:33:17,811 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:17,811 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:17,812 INFO L256 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 34 conjuncts are in the unsatisfiable core [2025-03-17 14:33:17,813 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:17,820 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 14:33:17,876 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:33:17,877 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 14:33:17,908 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:17,908 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:18,001 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:18,001 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703587859] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:18,001 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:33:18,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 6] total 12 [2025-03-17 14:33:18,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958065490] [2025-03-17 14:33:18,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:33:18,001 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:33:18,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:18,004 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:33:18,004 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2025-03-17 14:33:18,076 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 21 out of 64 [2025-03-17 14:33:18,076 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 108 places, 130 transitions, 921 flow. Second operand has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 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 14:33:18,076 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:18,076 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 21 of 64 [2025-03-17 14:33:18,076 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:19,009 INFO L124 PetriNetUnfolderBase]: 8308/12847 cut-off events. [2025-03-17 14:33:19,009 INFO L125 PetriNetUnfolderBase]: For 19342/21592 co-relation queries the response was YES. [2025-03-17 14:33:19,039 INFO L83 FinitePrefix]: Finished finitePrefix Result has 35286 conditions, 12847 events. 8308/12847 cut-off events. For 19342/21592 co-relation queries the response was YES. Maximal size of possible extension queue 321. Compared 76515 event pairs, 3573 based on Foata normal form. 0/10786 useless extension candidates. Maximal degree in co-relation 24346. Up to 6256 conditions per place. [2025-03-17 14:33:19,081 INFO L140 encePairwiseOnDemand]: 55/64 looper letters, 135 selfloop transitions, 28 changer transitions 0/172 dead transitions. [2025-03-17 14:33:19,082 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 114 places, 172 transitions, 1434 flow [2025-03-17 14:33:19,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:33:19,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:33:19,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 224 transitions. [2025-03-17 14:33:19,083 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5 [2025-03-17 14:33:19,083 INFO L175 Difference]: Start difference. First operand has 108 places, 130 transitions, 921 flow. Second operand 7 states and 224 transitions. [2025-03-17 14:33:19,083 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 114 places, 172 transitions, 1434 flow [2025-03-17 14:33:19,094 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 111 places, 172 transitions, 1396 flow, removed 0 selfloop flow, removed 3 redundant places. [2025-03-17 14:33:19,096 INFO L231 Difference]: Finished difference. Result has 113 places, 134 transitions, 992 flow [2025-03-17 14:33:19,096 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=883, PETRI_DIFFERENCE_MINUEND_PLACES=105, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=130, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=24, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=102, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=992, PETRI_PLACES=113, PETRI_TRANSITIONS=134} [2025-03-17 14:33:19,096 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 50 predicate places. [2025-03-17 14:33:19,096 INFO L471 AbstractCegarLoop]: Abstraction has has 113 places, 134 transitions, 992 flow [2025-03-17 14:33:19,096 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 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 14:33:19,096 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:19,096 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:19,102 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 14:33:19,301 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:19,301 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting thread2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:19,301 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:19,301 INFO L85 PathProgramCache]: Analyzing trace with hash -670951679, now seen corresponding path program 1 times [2025-03-17 14:33:19,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:19,301 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164148773] [2025-03-17 14:33:19,301 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:19,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:19,308 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 16 statements into 1 equivalence classes. [2025-03-17 14:33:19,313 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 16 of 16 statements. [2025-03-17 14:33:19,315 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:19,316 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:19,474 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2025-03-17 14:33:19,475 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:19,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164148773] [2025-03-17 14:33:19,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164148773] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:19,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889095217] [2025-03-17 14:33:19,475 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:19,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:19,476 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:19,477 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 14:33:19,479 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 14:33:19,522 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 16 statements into 1 equivalence classes. [2025-03-17 14:33:19,539 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 16 of 16 statements. [2025-03-17 14:33:19,539 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:19,539 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:19,544 INFO L256 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 39 conjuncts are in the unsatisfiable core [2025-03-17 14:33:19,545 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:19,554 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 14:33:19,558 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 14:33:19,606 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:33:19,607 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 31 treesize of output 28 [2025-03-17 14:33:19,634 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2025-03-17 14:33:19,634 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 14:33:19,731 INFO L349 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2025-03-17 14:33:19,731 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 40 [2025-03-17 14:33:20,026 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2025-03-17 14:33:20,026 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 14:33:20,080 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:33:20,080 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:20,356 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 14:33:20,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889095217] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:20,356 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:33:20,356 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 6] total 14 [2025-03-17 14:33:20,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426296244] [2025-03-17 14:33:20,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:33:20,356 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:33:20,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:20,357 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:33:20,357 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2025-03-17 14:33:20,565 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 21 out of 64 [2025-03-17 14:33:20,565 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 113 places, 134 transitions, 992 flow. Second operand has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 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 14:33:20,565 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:20,565 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 21 of 64 [2025-03-17 14:33:20,565 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:21,518 INFO L124 PetriNetUnfolderBase]: 7558/11521 cut-off events. [2025-03-17 14:33:21,518 INFO L125 PetriNetUnfolderBase]: For 23701/26029 co-relation queries the response was YES. [2025-03-17 14:33:21,544 INFO L83 FinitePrefix]: Finished finitePrefix Result has 35223 conditions, 11521 events. 7558/11521 cut-off events. For 23701/26029 co-relation queries the response was YES. Maximal size of possible extension queue 306. Compared 63902 event pairs, 2601 based on Foata normal form. 0/10585 useless extension candidates. Maximal degree in co-relation 24395. Up to 5265 conditions per place. [2025-03-17 14:33:21,582 INFO L140 encePairwiseOnDemand]: 52/64 looper letters, 117 selfloop transitions, 44 changer transitions 0/170 dead transitions. [2025-03-17 14:33:21,582 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 120 places, 170 transitions, 1477 flow [2025-03-17 14:33:21,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 14:33:21,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2025-03-17 14:33:21,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 243 transitions. [2025-03-17 14:33:21,584 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.474609375 [2025-03-17 14:33:21,584 INFO L175 Difference]: Start difference. First operand has 113 places, 134 transitions, 992 flow. Second operand 8 states and 243 transitions. [2025-03-17 14:33:21,584 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 120 places, 170 transitions, 1477 flow [2025-03-17 14:33:21,597 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 116 places, 170 transitions, 1446 flow, removed 0 selfloop flow, removed 4 redundant places. [2025-03-17 14:33:21,598 INFO L231 Difference]: Finished difference. Result has 118 places, 137 transitions, 1107 flow [2025-03-17 14:33:21,598 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=961, PETRI_DIFFERENCE_MINUEND_PLACES=109, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=134, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=41, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=90, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=1107, PETRI_PLACES=118, PETRI_TRANSITIONS=137} [2025-03-17 14:33:21,599 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 55 predicate places. [2025-03-17 14:33:21,599 INFO L471 AbstractCegarLoop]: Abstraction has has 118 places, 137 transitions, 1107 flow [2025-03-17 14:33:21,599 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 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 14:33:21,599 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:21,599 INFO L206 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:21,605 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 14:33:21,799 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 14:33:21,800 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:21,800 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:21,800 INFO L85 PathProgramCache]: Analyzing trace with hash -670951677, now seen corresponding path program 1 times [2025-03-17 14:33:21,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:21,800 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765659724] [2025-03-17 14:33:21,800 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:21,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:21,807 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 16 statements into 1 equivalence classes. [2025-03-17 14:33:21,813 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 16 of 16 statements. [2025-03-17 14:33:21,813 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:21,813 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:21,928 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:21,929 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:21,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765659724] [2025-03-17 14:33:21,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765659724] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:21,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861563770] [2025-03-17 14:33:21,929 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:21,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:21,929 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:21,931 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 14:33:21,932 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 14:33:21,975 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 16 statements into 1 equivalence classes. [2025-03-17 14:33:21,991 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 16 of 16 statements. [2025-03-17 14:33:21,991 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:21,992 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:21,992 INFO L256 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 16 conjuncts are in the unsatisfiable core [2025-03-17 14:33:21,994 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:21,996 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 14:33:22,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 14:33:22,026 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 14:33:22,032 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2025-03-17 14:33:22,032 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 14:33:22,071 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:22,071 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:22,139 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 52 treesize of output 48 [2025-03-17 14:33:22,180 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:22,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861563770] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:22,180 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:22,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2025-03-17 14:33:22,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649958396] [2025-03-17 14:33:22,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:22,180 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2025-03-17 14:33:22,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:22,180 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2025-03-17 14:33:22,181 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2025-03-17 14:33:22,408 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 64 [2025-03-17 14:33:22,409 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 118 places, 137 transitions, 1107 flow. Second operand has 13 states, 13 states have (on average 20.53846153846154) internal successors, (267), 13 states have internal predecessors, (267), 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 14:33:22,409 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:22,409 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 64 [2025-03-17 14:33:22,409 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:23,354 INFO L124 PetriNetUnfolderBase]: 7534/11617 cut-off events. [2025-03-17 14:33:23,354 INFO L125 PetriNetUnfolderBase]: For 32036/34232 co-relation queries the response was YES. [2025-03-17 14:33:23,383 INFO L83 FinitePrefix]: Finished finitePrefix Result has 40805 conditions, 11617 events. 7534/11617 cut-off events. For 32036/34232 co-relation queries the response was YES. Maximal size of possible extension queue 280. Compared 66776 event pairs, 2988 based on Foata normal form. 309/11359 useless extension candidates. Maximal degree in co-relation 28171. Up to 5475 conditions per place. [2025-03-17 14:33:23,497 INFO L140 encePairwiseOnDemand]: 51/64 looper letters, 135 selfloop transitions, 44 changer transitions 0/188 dead transitions. [2025-03-17 14:33:23,497 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 126 places, 188 transitions, 1691 flow [2025-03-17 14:33:23,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2025-03-17 14:33:23,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2025-03-17 14:33:23,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 257 transitions. [2025-03-17 14:33:23,499 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.4461805555555556 [2025-03-17 14:33:23,499 INFO L175 Difference]: Start difference. First operand has 118 places, 137 transitions, 1107 flow. Second operand 9 states and 257 transitions. [2025-03-17 14:33:23,499 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 126 places, 188 transitions, 1691 flow [2025-03-17 14:33:23,516 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 121 places, 188 transitions, 1624 flow, removed 0 selfloop flow, removed 5 redundant places. [2025-03-17 14:33:23,518 INFO L231 Difference]: Finished difference. Result has 121 places, 137 transitions, 1134 flow [2025-03-17 14:33:23,518 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1036, PETRI_DIFFERENCE_MINUEND_PLACES=113, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=136, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=43, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=93, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=1134, PETRI_PLACES=121, PETRI_TRANSITIONS=137} [2025-03-17 14:33:23,518 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 58 predicate places. [2025-03-17 14:33:23,518 INFO L471 AbstractCegarLoop]: Abstraction has has 121 places, 137 transitions, 1134 flow [2025-03-17 14:33:23,519 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 20.53846153846154) internal successors, (267), 13 states have internal predecessors, (267), 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 14:33:23,519 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:23,519 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:23,525 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 14:33:23,719 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 14:33:23,719 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:23,720 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:23,720 INFO L85 PathProgramCache]: Analyzing trace with hash -2048844584, now seen corresponding path program 1 times [2025-03-17 14:33:23,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:23,720 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70248955] [2025-03-17 14:33:23,720 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:23,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:23,726 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 17 statements into 1 equivalence classes. [2025-03-17 14:33:23,729 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 17 of 17 statements. [2025-03-17 14:33:23,730 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:23,730 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:23,782 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:33:23,782 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:23,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70248955] [2025-03-17 14:33:23,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70248955] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:23,782 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583251956] [2025-03-17 14:33:23,782 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:23,782 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:23,782 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:23,784 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 14:33:23,786 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 14:33:23,826 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 17 statements into 1 equivalence classes. [2025-03-17 14:33:23,841 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 17 of 17 statements. [2025-03-17 14:33:23,841 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:23,841 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:23,842 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-03-17 14:33:23,843 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:23,881 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:33:23,881 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:23,920 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:33:23,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583251956] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:23,921 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:23,921 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2025-03-17 14:33:23,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160526363] [2025-03-17 14:33:23,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:23,924 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2025-03-17 14:33:23,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:23,925 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2025-03-17 14:33:23,925 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2025-03-17 14:33:23,983 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:33:23,984 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 121 places, 137 transitions, 1134 flow. Second operand has 14 states, 14 states have (on average 22.357142857142858) internal successors, (313), 14 states have internal predecessors, (313), 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 14:33:23,984 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:23,984 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:33:23,984 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:24,959 INFO L124 PetriNetUnfolderBase]: 8995/13504 cut-off events. [2025-03-17 14:33:24,959 INFO L125 PetriNetUnfolderBase]: For 50256/51006 co-relation queries the response was YES. [2025-03-17 14:33:24,984 INFO L83 FinitePrefix]: Finished finitePrefix Result has 49402 conditions, 13504 events. 8995/13504 cut-off events. For 50256/51006 co-relation queries the response was YES. Maximal size of possible extension queue 291. Compared 75513 event pairs, 5605 based on Foata normal form. 146/13086 useless extension candidates. Maximal degree in co-relation 32490. Up to 8372 conditions per place. [2025-03-17 14:33:25,025 INFO L140 encePairwiseOnDemand]: 50/64 looper letters, 138 selfloop transitions, 76 changer transitions 0/222 dead transitions. [2025-03-17 14:33:25,025 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 130 places, 222 transitions, 2083 flow [2025-03-17 14:33:25,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2025-03-17 14:33:25,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2025-03-17 14:33:25,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 330 transitions. [2025-03-17 14:33:25,026 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.515625 [2025-03-17 14:33:25,026 INFO L175 Difference]: Start difference. First operand has 121 places, 137 transitions, 1134 flow. Second operand 10 states and 330 transitions. [2025-03-17 14:33:25,026 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 130 places, 222 transitions, 2083 flow [2025-03-17 14:33:25,044 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 123 places, 222 transitions, 1951 flow, removed 0 selfloop flow, removed 7 redundant places. [2025-03-17 14:33:25,046 INFO L231 Difference]: Finished difference. Result has 126 places, 141 transitions, 1262 flow [2025-03-17 14:33:25,047 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1045, PETRI_DIFFERENCE_MINUEND_PLACES=114, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=137, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=72, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=1262, PETRI_PLACES=126, PETRI_TRANSITIONS=141} [2025-03-17 14:33:25,047 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 63 predicate places. [2025-03-17 14:33:25,047 INFO L471 AbstractCegarLoop]: Abstraction has has 126 places, 141 transitions, 1262 flow [2025-03-17 14:33:25,047 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 22.357142857142858) internal successors, (313), 14 states have internal predecessors, (313), 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 14:33:25,047 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:25,047 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:25,055 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2025-03-17 14:33:25,252 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 14:33:25,252 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:25,252 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:25,252 INFO L85 PathProgramCache]: Analyzing trace with hash 457004436, now seen corresponding path program 1 times [2025-03-17 14:33:25,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:25,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001249977] [2025-03-17 14:33:25,253 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:25,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:25,258 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-03-17 14:33:25,262 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-03-17 14:33:25,262 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:25,262 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:25,323 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:33:25,324 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:25,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001249977] [2025-03-17 14:33:25,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001249977] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:25,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956094476] [2025-03-17 14:33:25,325 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:25,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:25,325 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:25,327 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 14:33:25,329 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 14:33:25,376 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 19 statements into 1 equivalence classes. [2025-03-17 14:33:25,394 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 19 of 19 statements. [2025-03-17 14:33:25,395 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:25,395 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:25,396 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-03-17 14:33:25,397 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:25,449 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:33:25,449 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:25,498 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:33:25,498 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956094476] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:25,498 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:25,498 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2025-03-17 14:33:25,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737337380] [2025-03-17 14:33:25,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:25,499 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2025-03-17 14:33:25,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:25,499 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2025-03-17 14:33:25,499 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2025-03-17 14:33:25,540 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:33:25,541 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 126 places, 141 transitions, 1262 flow. Second operand has 14 states, 14 states have (on average 22.571428571428573) internal successors, (316), 14 states have internal predecessors, (316), 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 14:33:25,541 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:25,541 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:33:25,541 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:26,358 INFO L124 PetriNetUnfolderBase]: 7479/10981 cut-off events. [2025-03-17 14:33:26,359 INFO L125 PetriNetUnfolderBase]: For 42511/45495 co-relation queries the response was YES. [2025-03-17 14:33:26,383 INFO L83 FinitePrefix]: Finished finitePrefix Result has 40803 conditions, 10981 events. 7479/10981 cut-off events. For 42511/45495 co-relation queries the response was YES. Maximal size of possible extension queue 193. Compared 55527 event pairs, 4941 based on Foata normal form. 87/10573 useless extension candidates. Maximal degree in co-relation 25517. Up to 7840 conditions per place. [2025-03-17 14:33:26,420 INFO L140 encePairwiseOnDemand]: 50/64 looper letters, 117 selfloop transitions, 78 changer transitions 0/203 dead transitions. [2025-03-17 14:33:26,421 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 135 places, 203 transitions, 1984 flow [2025-03-17 14:33:26,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2025-03-17 14:33:26,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2025-03-17 14:33:26,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 319 transitions. [2025-03-17 14:33:26,422 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.4984375 [2025-03-17 14:33:26,422 INFO L175 Difference]: Start difference. First operand has 126 places, 141 transitions, 1262 flow. Second operand 10 states and 319 transitions. [2025-03-17 14:33:26,422 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 135 places, 203 transitions, 1984 flow [2025-03-17 14:33:26,449 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 129 places, 203 transitions, 1842 flow, removed 7 selfloop flow, removed 6 redundant places. [2025-03-17 14:33:26,452 INFO L231 Difference]: Finished difference. Result has 132 places, 145 transitions, 1362 flow [2025-03-17 14:33:26,452 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1128, PETRI_DIFFERENCE_MINUEND_PLACES=120, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=141, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=74, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=1362, PETRI_PLACES=132, PETRI_TRANSITIONS=145} [2025-03-17 14:33:26,452 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 69 predicate places. [2025-03-17 14:33:26,452 INFO L471 AbstractCegarLoop]: Abstraction has has 132 places, 145 transitions, 1362 flow [2025-03-17 14:33:26,453 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 22.571428571428573) internal successors, (316), 14 states have internal predecessors, (316), 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 14:33:26,453 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:26,453 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 14:33:26,460 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 14:33:26,654 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:26,655 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:26,655 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:26,655 INFO L85 PathProgramCache]: Analyzing trace with hash -1831664726, now seen corresponding path program 1 times [2025-03-17 14:33:26,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:26,655 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457545394] [2025-03-17 14:33:26,655 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:26,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:26,666 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 20 statements into 1 equivalence classes. [2025-03-17 14:33:26,669 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 20 of 20 statements. [2025-03-17 14:33:26,669 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:26,669 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:26,760 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:26,760 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:26,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457545394] [2025-03-17 14:33:26,761 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457545394] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:26,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684689274] [2025-03-17 14:33:26,761 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:26,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:26,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:26,763 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 14:33:26,764 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 14:33:26,812 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 20 statements into 1 equivalence classes. [2025-03-17 14:33:26,828 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 20 of 20 statements. [2025-03-17 14:33:26,828 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:26,828 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:26,829 INFO L256 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 34 conjuncts are in the unsatisfiable core [2025-03-17 14:33:26,830 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:26,837 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 8 treesize of output 1 [2025-03-17 14:33:26,899 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:33:26,899 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 14:33:26,944 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:26,944 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:27,027 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:27,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684689274] provided 1 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:27,027 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2025-03-17 14:33:27,027 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 6] total 13 [2025-03-17 14:33:27,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701716126] [2025-03-17 14:33:27,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:33:27,027 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 14:33:27,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:27,027 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 14:33:27,027 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2025-03-17 14:33:27,091 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 21 out of 64 [2025-03-17 14:33:27,091 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 132 places, 145 transitions, 1362 flow. Second operand has 7 states, 7 states have (on average 23.571428571428573) internal successors, (165), 7 states have internal predecessors, (165), 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 14:33:27,091 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:27,091 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 21 of 64 [2025-03-17 14:33:27,091 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:28,278 INFO L124 PetriNetUnfolderBase]: 8351/13272 cut-off events. [2025-03-17 14:33:28,278 INFO L125 PetriNetUnfolderBase]: For 61946/64782 co-relation queries the response was YES. [2025-03-17 14:33:28,331 INFO L83 FinitePrefix]: Finished finitePrefix Result has 49617 conditions, 13272 events. 8351/13272 cut-off events. For 61946/64782 co-relation queries the response was YES. Maximal size of possible extension queue 263. Compared 82123 event pairs, 3562 based on Foata normal form. 0/12587 useless extension candidates. Maximal degree in co-relation 38096. Up to 6184 conditions per place. [2025-03-17 14:33:28,394 INFO L140 encePairwiseOnDemand]: 56/64 looper letters, 165 selfloop transitions, 26 changer transitions 0/200 dead transitions. [2025-03-17 14:33:28,394 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 138 places, 200 transitions, 2184 flow [2025-03-17 14:33:28,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 14:33:28,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2025-03-17 14:33:28,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 225 transitions. [2025-03-17 14:33:28,395 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.5022321428571429 [2025-03-17 14:33:28,395 INFO L175 Difference]: Start difference. First operand has 132 places, 145 transitions, 1362 flow. Second operand 7 states and 225 transitions. [2025-03-17 14:33:28,395 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 138 places, 200 transitions, 2184 flow [2025-03-17 14:33:28,433 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 133 places, 200 transitions, 2065 flow, removed 6 selfloop flow, removed 5 redundant places. [2025-03-17 14:33:28,435 INFO L231 Difference]: Finished difference. Result has 135 places, 147 transitions, 1336 flow [2025-03-17 14:33:28,436 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1249, PETRI_DIFFERENCE_MINUEND_PLACES=127, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=145, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=24, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=119, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=1336, PETRI_PLACES=135, PETRI_TRANSITIONS=147} [2025-03-17 14:33:28,436 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 72 predicate places. [2025-03-17 14:33:28,436 INFO L471 AbstractCegarLoop]: Abstraction has has 135 places, 147 transitions, 1336 flow [2025-03-17 14:33:28,436 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 23.571428571428573) internal successors, (165), 7 states have internal predecessors, (165), 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 14:33:28,436 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:28,436 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 14:33:28,442 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2025-03-17 14:33:28,637 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,SelfDestructingSolverStorable20 [2025-03-17 14:33:28,637 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONMEMORY_LEAK === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:28,637 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:28,637 INFO L85 PathProgramCache]: Analyzing trace with hash -1231637513, now seen corresponding path program 1 times [2025-03-17 14:33:28,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:28,637 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995576126] [2025-03-17 14:33:28,637 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:28,638 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:28,642 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 14:33:28,647 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 14:33:28,647 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:28,647 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:28,715 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 14:33:28,715 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:28,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995576126] [2025-03-17 14:33:28,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995576126] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 14:33:28,715 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 14:33:28,715 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-03-17 14:33:28,715 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534014731] [2025-03-17 14:33:28,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 14:33:28,715 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2025-03-17 14:33:28,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:28,715 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2025-03-17 14:33:28,716 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2025-03-17 14:33:28,716 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 21 out of 64 [2025-03-17 14:33:28,716 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 135 places, 147 transitions, 1336 flow. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 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 14:33:28,716 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:28,716 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 21 of 64 [2025-03-17 14:33:28,716 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:29,780 INFO L124 PetriNetUnfolderBase]: 8882/14216 cut-off events. [2025-03-17 14:33:29,781 INFO L125 PetriNetUnfolderBase]: For 68531/71389 co-relation queries the response was YES. [2025-03-17 14:33:29,812 INFO L83 FinitePrefix]: Finished finitePrefix Result has 55012 conditions, 14216 events. 8882/14216 cut-off events. For 68531/71389 co-relation queries the response was YES. Maximal size of possible extension queue 285. Compared 87915 event pairs, 2153 based on Foata normal form. 6/13886 useless extension candidates. Maximal degree in co-relation 42614. Up to 9091 conditions per place. [2025-03-17 14:33:29,854 INFO L140 encePairwiseOnDemand]: 60/64 looper letters, 144 selfloop transitions, 3 changer transitions 22/178 dead transitions. [2025-03-17 14:33:29,854 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 137 places, 178 transitions, 1900 flow [2025-03-17 14:33:29,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2025-03-17 14:33:29,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2025-03-17 14:33:29,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 123 transitions. [2025-03-17 14:33:29,855 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.640625 [2025-03-17 14:33:29,855 INFO L175 Difference]: Start difference. First operand has 135 places, 147 transitions, 1336 flow. Second operand 3 states and 123 transitions. [2025-03-17 14:33:29,855 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 137 places, 178 transitions, 1900 flow [2025-03-17 14:33:29,883 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 132 places, 178 transitions, 1864 flow, removed 0 selfloop flow, removed 5 redundant places. [2025-03-17 14:33:29,884 INFO L231 Difference]: Finished difference. Result has 133 places, 128 transitions, 988 flow [2025-03-17 14:33:29,884 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1301, PETRI_DIFFERENCE_MINUEND_PLACES=130, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=147, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=144, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=988, PETRI_PLACES=133, PETRI_TRANSITIONS=128} [2025-03-17 14:33:29,885 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 70 predicate places. [2025-03-17 14:33:29,885 INFO L471 AbstractCegarLoop]: Abstraction has has 133 places, 128 transitions, 988 flow [2025-03-17 14:33:29,885 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 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 14:33:29,885 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:29,885 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:29,885 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2025-03-17 14:33:29,885 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:29,885 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:29,885 INFO L85 PathProgramCache]: Analyzing trace with hash -620994429, now seen corresponding path program 2 times [2025-03-17 14:33:29,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:29,886 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449415165] [2025-03-17 14:33:29,886 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:33:29,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:29,890 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 23 statements into 2 equivalence classes. [2025-03-17 14:33:29,902 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 23 of 23 statements. [2025-03-17 14:33:29,902 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:33:29,902 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:30,158 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:33:30,158 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:30,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449415165] [2025-03-17 14:33:30,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449415165] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:30,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965705488] [2025-03-17 14:33:30,158 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:33:30,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:30,159 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:30,164 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 14:33:30,167 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 14:33:30,214 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 23 statements into 2 equivalence classes. [2025-03-17 14:33:30,237 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 23 of 23 statements. [2025-03-17 14:33:30,237 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:33:30,237 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:30,241 INFO L256 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 39 conjuncts are in the unsatisfiable core [2025-03-17 14:33:30,243 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:30,248 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 14:33:30,323 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:33:30,323 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 14:33:30,400 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:33:30,401 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 14:33:30,607 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:33:30,607 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:30,847 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:33:30,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965705488] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:30,848 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:30,848 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 22 [2025-03-17 14:33:30,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735268600] [2025-03-17 14:33:30,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:30,848 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2025-03-17 14:33:30,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:30,849 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2025-03-17 14:33:30,849 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2025-03-17 14:33:31,636 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 64 [2025-03-17 14:33:31,637 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 133 places, 128 transitions, 988 flow. Second operand has 24 states, 24 states have (on average 14.333333333333334) internal successors, (344), 24 states have internal predecessors, (344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 14:33:31,637 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:31,637 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 64 [2025-03-17 14:33:31,637 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:34,682 INFO L124 PetriNetUnfolderBase]: 15510/23616 cut-off events. [2025-03-17 14:33:34,683 INFO L125 PetriNetUnfolderBase]: For 98979/100878 co-relation queries the response was YES. [2025-03-17 14:33:34,775 INFO L83 FinitePrefix]: Finished finitePrefix Result has 91533 conditions, 23616 events. 15510/23616 cut-off events. For 98979/100878 co-relation queries the response was YES. Maximal size of possible extension queue 431. Compared 151250 event pairs, 3048 based on Foata normal form. 729/23931 useless extension candidates. Maximal degree in co-relation 71319. Up to 5247 conditions per place. [2025-03-17 14:33:34,862 INFO L140 encePairwiseOnDemand]: 52/64 looper letters, 255 selfloop transitions, 52 changer transitions 0/314 dead transitions. [2025-03-17 14:33:34,863 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 143 places, 314 transitions, 2769 flow [2025-03-17 14:33:34,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2025-03-17 14:33:34,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2025-03-17 14:33:34,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 440 transitions. [2025-03-17 14:33:34,864 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.3618421052631579 [2025-03-17 14:33:34,864 INFO L175 Difference]: Start difference. First operand has 133 places, 128 transitions, 988 flow. Second operand 19 states and 440 transitions. [2025-03-17 14:33:34,864 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 143 places, 314 transitions, 2769 flow [2025-03-17 14:33:34,987 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 127 places, 314 transitions, 2445 flow, removed 50 selfloop flow, removed 16 redundant places. [2025-03-17 14:33:34,990 INFO L231 Difference]: Finished difference. Result has 129 places, 134 transitions, 1023 flow [2025-03-17 14:33:34,990 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=848, PETRI_DIFFERENCE_MINUEND_PLACES=109, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=126, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=44, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=81, PETRI_DIFFERENCE_SUBTRAHEND_STATES=19, PETRI_FLOW=1023, PETRI_PLACES=129, PETRI_TRANSITIONS=134} [2025-03-17 14:33:34,990 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 66 predicate places. [2025-03-17 14:33:34,990 INFO L471 AbstractCegarLoop]: Abstraction has has 129 places, 134 transitions, 1023 flow [2025-03-17 14:33:34,991 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 14.333333333333334) internal successors, (344), 24 states have internal predecessors, (344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 14:33:34,991 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:34,991 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:34,998 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2025-03-17 14:33:35,191 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,SelfDestructingSolverStorable22 [2025-03-17 14:33:35,191 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:35,192 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:35,192 INFO L85 PathProgramCache]: Analyzing trace with hash -2070957563, now seen corresponding path program 1 times [2025-03-17 14:33:35,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:35,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542582410] [2025-03-17 14:33:35,192 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:35,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:35,197 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 24 statements into 1 equivalence classes. [2025-03-17 14:33:35,201 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 24 of 24 statements. [2025-03-17 14:33:35,201 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:35,201 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:35,392 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2025-03-17 14:33:35,392 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:35,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542582410] [2025-03-17 14:33:35,392 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542582410] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:35,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089792321] [2025-03-17 14:33:35,392 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:35,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:35,392 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:35,394 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 14:33:35,396 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 14:33:35,444 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 24 statements into 1 equivalence classes. [2025-03-17 14:33:35,463 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 24 of 24 statements. [2025-03-17 14:33:35,463 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:35,463 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:35,465 INFO L256 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 40 conjuncts are in the unsatisfiable core [2025-03-17 14:33:35,466 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:35,479 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 14:33:35,483 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 14:33:35,528 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2025-03-17 14:33:35,528 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 14:33:35,545 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 31 treesize of output 24 [2025-03-17 14:33:35,841 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2025-03-17 14:33:35,841 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:36,098 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 14:33:36,102 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2025-03-17 14:33:36,102 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2089792321] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:36,102 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:36,102 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 7] total 23 [2025-03-17 14:33:36,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110226053] [2025-03-17 14:33:36,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:36,102 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2025-03-17 14:33:36,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:36,102 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2025-03-17 14:33:36,103 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2025-03-17 14:33:36,557 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 64 [2025-03-17 14:33:36,557 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 129 places, 134 transitions, 1023 flow. Second operand has 24 states, 24 states have (on average 16.333333333333332) internal successors, (392), 24 states have internal predecessors, (392), 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 14:33:36,557 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:36,557 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 64 [2025-03-17 14:33:36,557 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:38,688 INFO L124 PetriNetUnfolderBase]: 13116/20307 cut-off events. [2025-03-17 14:33:38,688 INFO L125 PetriNetUnfolderBase]: For 62561/63183 co-relation queries the response was YES. [2025-03-17 14:33:38,740 INFO L83 FinitePrefix]: Finished finitePrefix Result has 74287 conditions, 20307 events. 13116/20307 cut-off events. For 62561/63183 co-relation queries the response was YES. Maximal size of possible extension queue 389. Compared 129860 event pairs, 5453 based on Foata normal form. 364/19831 useless extension candidates. Maximal degree in co-relation 37087. Up to 9481 conditions per place. [2025-03-17 14:33:38,817 INFO L140 encePairwiseOnDemand]: 50/64 looper letters, 162 selfloop transitions, 46 changer transitions 0/217 dead transitions. [2025-03-17 14:33:38,818 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 145 places, 217 transitions, 1886 flow [2025-03-17 14:33:38,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2025-03-17 14:33:38,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2025-03-17 14:33:38,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 361 transitions. [2025-03-17 14:33:38,819 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.3318014705882353 [2025-03-17 14:33:38,819 INFO L175 Difference]: Start difference. First operand has 129 places, 134 transitions, 1023 flow. Second operand 17 states and 361 transitions. [2025-03-17 14:33:38,819 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 145 places, 217 transitions, 1886 flow [2025-03-17 14:33:38,872 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 136 places, 217 transitions, 1817 flow, removed 5 selfloop flow, removed 9 redundant places. [2025-03-17 14:33:38,874 INFO L231 Difference]: Finished difference. Result has 139 places, 136 transitions, 1073 flow [2025-03-17 14:33:38,874 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=954, PETRI_DIFFERENCE_MINUEND_PLACES=120, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=134, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=44, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=88, PETRI_DIFFERENCE_SUBTRAHEND_STATES=17, PETRI_FLOW=1073, PETRI_PLACES=139, PETRI_TRANSITIONS=136} [2025-03-17 14:33:38,874 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 76 predicate places. [2025-03-17 14:33:38,874 INFO L471 AbstractCegarLoop]: Abstraction has has 139 places, 136 transitions, 1073 flow [2025-03-17 14:33:38,875 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 16.333333333333332) internal successors, (392), 24 states have internal predecessors, (392), 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 14:33:38,875 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:38,875 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:38,881 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 14:33:39,075 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:39,075 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:39,076 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:39,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1768531329, now seen corresponding path program 2 times [2025-03-17 14:33:39,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:39,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094260167] [2025-03-17 14:33:39,076 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:33:39,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:39,081 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 25 statements into 2 equivalence classes. [2025-03-17 14:33:39,100 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 14:33:39,100 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:33:39,100 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:39,482 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:39,483 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:39,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094260167] [2025-03-17 14:33:39,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094260167] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:39,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660661376] [2025-03-17 14:33:39,483 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:33:39,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:39,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:39,485 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 14:33:39,487 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 14:33:39,538 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 25 statements into 2 equivalence classes. [2025-03-17 14:33:39,567 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 14:33:39,567 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:33:39,567 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:39,572 INFO L256 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 28 conjuncts are in the unsatisfiable core [2025-03-17 14:33:39,573 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:39,621 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 14:33:39,695 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2025-03-17 14:33:39,696 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 14:33:39,700 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 14:33:39,846 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2025-03-17 14:33:39,846 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:40,043 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 66 treesize of output 62 [2025-03-17 14:33:40,250 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2025-03-17 14:33:40,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660661376] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:40,250 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:40,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 10] total 30 [2025-03-17 14:33:40,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056988230] [2025-03-17 14:33:40,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:40,251 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2025-03-17 14:33:40,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:40,251 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2025-03-17 14:33:40,252 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=855, Unknown=0, NotChecked=0, Total=992 [2025-03-17 14:33:41,054 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 17 out of 64 [2025-03-17 14:33:41,054 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 139 places, 136 transitions, 1073 flow. Second operand has 32 states, 32 states have (on average 19.15625) internal successors, (613), 32 states have internal predecessors, (613), 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 14:33:41,054 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:41,054 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 17 of 64 [2025-03-17 14:33:41,054 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:46,169 INFO L124 PetriNetUnfolderBase]: 27154/40446 cut-off events. [2025-03-17 14:33:46,169 INFO L125 PetriNetUnfolderBase]: For 140216/141608 co-relation queries the response was YES. [2025-03-17 14:33:46,308 INFO L83 FinitePrefix]: Finished finitePrefix Result has 150846 conditions, 40446 events. 27154/40446 cut-off events. For 140216/141608 co-relation queries the response was YES. Maximal size of possible extension queue 910. Compared 271839 event pairs, 10777 based on Foata normal form. 183/39061 useless extension candidates. Maximal degree in co-relation 101638. Up to 10999 conditions per place. [2025-03-17 14:33:46,473 INFO L140 encePairwiseOnDemand]: 47/64 looper letters, 433 selfloop transitions, 96 changer transitions 0/538 dead transitions. [2025-03-17 14:33:46,473 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 181 places, 538 transitions, 4503 flow [2025-03-17 14:33:46,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2025-03-17 14:33:46,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2025-03-17 14:33:46,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 1124 transitions. [2025-03-17 14:33:46,475 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.40843023255813954 [2025-03-17 14:33:46,475 INFO L175 Difference]: Start difference. First operand has 139 places, 136 transitions, 1073 flow. Second operand 43 states and 1124 transitions. [2025-03-17 14:33:46,475 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 181 places, 538 transitions, 4503 flow [2025-03-17 14:33:46,563 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 173 places, 538 transitions, 4311 flow, removed 0 selfloop flow, removed 8 redundant places. [2025-03-17 14:33:46,567 INFO L231 Difference]: Finished difference. Result has 182 places, 167 transitions, 1531 flow [2025-03-17 14:33:46,567 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1006, PETRI_DIFFERENCE_MINUEND_PLACES=131, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=136, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=67, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=43, PETRI_FLOW=1531, PETRI_PLACES=182, PETRI_TRANSITIONS=167} [2025-03-17 14:33:46,567 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 119 predicate places. [2025-03-17 14:33:46,567 INFO L471 AbstractCegarLoop]: Abstraction has has 182 places, 167 transitions, 1531 flow [2025-03-17 14:33:46,567 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 19.15625) internal successors, (613), 32 states have internal predecessors, (613), 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 14:33:46,568 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:46,568 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:46,573 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 14:33:46,772 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:46,772 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:46,772 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:46,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1768531327, now seen corresponding path program 1 times [2025-03-17 14:33:46,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:46,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259410026] [2025-03-17 14:33:46,772 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:46,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:46,779 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes. [2025-03-17 14:33:46,786 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 14:33:46,786 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:46,786 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:47,001 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:33:47,001 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:47,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259410026] [2025-03-17 14:33:47,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259410026] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:47,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553763115] [2025-03-17 14:33:47,002 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:47,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:47,002 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:47,004 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 14:33:47,005 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 14:33:47,060 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes. [2025-03-17 14:33:47,089 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 14:33:47,090 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:47,090 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:47,091 INFO L256 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 17 conjuncts are in the unsatisfiable core [2025-03-17 14:33:47,092 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:47,201 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2025-03-17 14:33:47,201 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:47,278 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2025-03-17 14:33:47,315 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2025-03-17 14:33:47,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553763115] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:47,315 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:47,315 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 22 [2025-03-17 14:33:47,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90257065] [2025-03-17 14:33:47,315 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:47,316 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2025-03-17 14:33:47,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:47,317 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2025-03-17 14:33:47,317 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2025-03-17 14:33:47,770 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:33:47,771 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 182 places, 167 transitions, 1531 flow. Second operand has 23 states, 23 states have (on average 22.52173913043478) internal successors, (518), 23 states have internal predecessors, (518), 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 14:33:47,771 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:47,771 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:33:47,771 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:52,152 INFO L124 PetriNetUnfolderBase]: 34093/48931 cut-off events. [2025-03-17 14:33:52,153 INFO L125 PetriNetUnfolderBase]: For 174741/176977 co-relation queries the response was YES. [2025-03-17 14:33:52,454 INFO L83 FinitePrefix]: Finished finitePrefix Result has 196509 conditions, 48931 events. 34093/48931 cut-off events. For 174741/176977 co-relation queries the response was YES. Maximal size of possible extension queue 1110. Compared 321254 event pairs, 11396 based on Foata normal form. 1956/49674 useless extension candidates. Maximal degree in co-relation 160007. Up to 18591 conditions per place. [2025-03-17 14:33:52,865 INFO L140 encePairwiseOnDemand]: 51/64 looper letters, 217 selfloop transitions, 60 changer transitions 0/286 dead transitions. [2025-03-17 14:33:52,865 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 195 places, 286 transitions, 2778 flow [2025-03-17 14:33:52,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2025-03-17 14:33:52,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2025-03-17 14:33:52,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 430 transitions. [2025-03-17 14:33:52,867 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.4799107142857143 [2025-03-17 14:33:52,867 INFO L175 Difference]: Start difference. First operand has 182 places, 167 transitions, 1531 flow. Second operand 14 states and 430 transitions. [2025-03-17 14:33:52,867 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 195 places, 286 transitions, 2778 flow [2025-03-17 14:33:53,245 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 181 places, 286 transitions, 2674 flow, removed 12 selfloop flow, removed 14 redundant places. [2025-03-17 14:33:53,248 INFO L231 Difference]: Finished difference. Result has 184 places, 168 transitions, 1605 flow [2025-03-17 14:33:53,248 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1362, PETRI_DIFFERENCE_MINUEND_PLACES=168, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=161, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=53, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=104, PETRI_DIFFERENCE_SUBTRAHEND_STATES=14, PETRI_FLOW=1605, PETRI_PLACES=184, PETRI_TRANSITIONS=168} [2025-03-17 14:33:53,248 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 121 predicate places. [2025-03-17 14:33:53,248 INFO L471 AbstractCegarLoop]: Abstraction has has 184 places, 168 transitions, 1605 flow [2025-03-17 14:33:53,248 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 22.52173913043478) internal successors, (518), 23 states have internal predecessors, (518), 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 14:33:53,248 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:33:53,248 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:33:53,254 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2025-03-17 14:33:53,450 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,SelfDestructingSolverStorable25 [2025-03-17 14:33:53,450 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting thread2Err5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:33:53,450 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:33:53,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1768531331, now seen corresponding path program 1 times [2025-03-17 14:33:53,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:33:53,451 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957388064] [2025-03-17 14:33:53,451 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:53,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:33:53,459 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes. [2025-03-17 14:33:53,468 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 14:33:53,469 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:53,469 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:53,882 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2025-03-17 14:33:53,882 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:33:53,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957388064] [2025-03-17 14:33:53,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957388064] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:33:53,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740538275] [2025-03-17 14:33:53,882 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:33:53,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:33:53,882 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:33:53,884 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 14:33:53,884 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 14:33:53,933 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes. [2025-03-17 14:33:53,951 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 14:33:53,951 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:33:53,951 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:33:53,952 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 43 conjuncts are in the unsatisfiable core [2025-03-17 14:33:53,954 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:33:53,961 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 14:33:54,012 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2025-03-17 14:33:54,012 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 14:33:54,072 INFO L349 Elim1Store]: treesize reduction 40, result has 21.6 percent of original size [2025-03-17 14:33:54,073 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 14:33:54,354 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2025-03-17 14:33:54,354 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:33:54,572 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2025-03-17 14:33:54,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740538275] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:33:54,572 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:33:54,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 7] total 25 [2025-03-17 14:33:54,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062569018] [2025-03-17 14:33:54,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:33:54,572 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2025-03-17 14:33:54,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:33:54,573 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2025-03-17 14:33:54,573 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=573, Unknown=0, NotChecked=0, Total=702 [2025-03-17 14:33:55,000 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 64 [2025-03-17 14:33:55,001 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 184 places, 168 transitions, 1605 flow. Second operand has 27 states, 27 states have (on average 16.444444444444443) internal successors, (444), 27 states have internal predecessors, (444), 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 14:33:55,001 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:33:55,001 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 64 [2025-03-17 14:33:55,001 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:33:59,707 INFO L124 PetriNetUnfolderBase]: 29596/42445 cut-off events. [2025-03-17 14:33:59,708 INFO L125 PetriNetUnfolderBase]: For 164605/166726 co-relation queries the response was YES. [2025-03-17 14:33:59,887 INFO L83 FinitePrefix]: Finished finitePrefix Result has 176118 conditions, 42445 events. 29596/42445 cut-off events. For 164605/166726 co-relation queries the response was YES. Maximal size of possible extension queue 1034. Compared 274934 event pairs, 8374 based on Foata normal form. 735/42695 useless extension candidates. Maximal degree in co-relation 141888. Up to 13387 conditions per place. [2025-03-17 14:34:00,207 INFO L140 encePairwiseOnDemand]: 48/64 looper letters, 197 selfloop transitions, 59 changer transitions 0/265 dead transitions. [2025-03-17 14:34:00,208 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 194 places, 265 transitions, 2526 flow [2025-03-17 14:34:00,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2025-03-17 14:34:00,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2025-03-17 14:34:00,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 399 transitions. [2025-03-17 14:34:00,209 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.3463541666666667 [2025-03-17 14:34:00,209 INFO L175 Difference]: Start difference. First operand has 184 places, 168 transitions, 1605 flow. Second operand 18 states and 399 transitions. [2025-03-17 14:34:00,209 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 194 places, 265 transitions, 2526 flow [2025-03-17 14:34:00,693 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 178 places, 265 transitions, 2385 flow, removed 16 selfloop flow, removed 16 redundant places. [2025-03-17 14:34:00,695 INFO L231 Difference]: Finished difference. Result has 180 places, 157 transitions, 1469 flow [2025-03-17 14:34:00,696 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1313, PETRI_DIFFERENCE_MINUEND_PLACES=161, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=156, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=58, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=97, PETRI_DIFFERENCE_SUBTRAHEND_STATES=18, PETRI_FLOW=1469, PETRI_PLACES=180, PETRI_TRANSITIONS=157} [2025-03-17 14:34:00,696 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 117 predicate places. [2025-03-17 14:34:00,696 INFO L471 AbstractCegarLoop]: Abstraction has has 180 places, 157 transitions, 1469 flow [2025-03-17 14:34:00,696 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 16.444444444444443) internal successors, (444), 27 states have internal predecessors, (444), 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 14:34:00,696 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:34:00,696 INFO L206 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:34:00,702 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2025-03-17 14:34:00,896 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,SelfDestructingSolverStorable26 [2025-03-17 14:34:00,897 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:34:00,897 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:34:00,897 INFO L85 PathProgramCache]: Analyzing trace with hash -1338386033, now seen corresponding path program 1 times [2025-03-17 14:34:00,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:34:00,897 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300897691] [2025-03-17 14:34:00,897 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:34:00,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:34:00,904 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 26 statements into 1 equivalence classes. [2025-03-17 14:34:00,908 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 26 of 26 statements. [2025-03-17 14:34:00,909 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:34:00,909 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:34:00,980 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:34:00,980 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:34:00,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300897691] [2025-03-17 14:34:00,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300897691] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:34:00,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079156702] [2025-03-17 14:34:00,980 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 14:34:00,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:34:00,980 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:34:00,983 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 14:34:00,984 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 14:34:01,042 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 26 statements into 1 equivalence classes. [2025-03-17 14:34:01,062 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 26 of 26 statements. [2025-03-17 14:34:01,062 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 14:34:01,062 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:34:01,064 INFO L256 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 8 conjuncts are in the unsatisfiable core [2025-03-17 14:34:01,065 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:34:01,129 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:34:01,130 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:34:01,179 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2025-03-17 14:34:01,179 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079156702] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:34:01,179 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:34:01,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2025-03-17 14:34:01,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849064689] [2025-03-17 14:34:01,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:34:01,180 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2025-03-17 14:34:01,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:34:01,180 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2025-03-17 14:34:01,180 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2025-03-17 14:34:01,229 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:34:01,230 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 180 places, 157 transitions, 1469 flow. Second operand has 14 states, 14 states have (on average 23.0) internal successors, (322), 14 states have internal predecessors, (322), 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 14:34:01,230 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:34:01,230 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:34:01,230 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:34:05,391 INFO L124 PetriNetUnfolderBase]: 28301/42206 cut-off events. [2025-03-17 14:34:05,391 INFO L125 PetriNetUnfolderBase]: For 222166/224809 co-relation queries the response was YES. [2025-03-17 14:34:05,614 INFO L83 FinitePrefix]: Finished finitePrefix Result has 178938 conditions, 42206 events. 28301/42206 cut-off events. For 222166/224809 co-relation queries the response was YES. Maximal size of possible extension queue 1038. Compared 286376 event pairs, 17597 based on Foata normal form. 298/39964 useless extension candidates. Maximal degree in co-relation 141061. Up to 30419 conditions per place. [2025-03-17 14:34:05,783 INFO L140 encePairwiseOnDemand]: 50/64 looper letters, 182 selfloop transitions, 66 changer transitions 1/260 dead transitions. [2025-03-17 14:34:05,783 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 191 places, 260 transitions, 2804 flow [2025-03-17 14:34:05,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2025-03-17 14:34:05,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2025-03-17 14:34:05,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 372 transitions. [2025-03-17 14:34:05,784 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.484375 [2025-03-17 14:34:05,784 INFO L175 Difference]: Start difference. First operand has 180 places, 157 transitions, 1469 flow. Second operand 12 states and 372 transitions. [2025-03-17 14:34:05,784 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 191 places, 260 transitions, 2804 flow [2025-03-17 14:34:05,992 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 176 places, 260 transitions, 2645 flow, removed 4 selfloop flow, removed 15 redundant places. [2025-03-17 14:34:05,994 INFO L231 Difference]: Finished difference. Result has 179 places, 161 transitions, 1520 flow [2025-03-17 14:34:05,994 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1360, PETRI_DIFFERENCE_MINUEND_PLACES=165, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=157, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=63, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=92, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=1520, PETRI_PLACES=179, PETRI_TRANSITIONS=161} [2025-03-17 14:34:05,995 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 116 predicate places. [2025-03-17 14:34:05,995 INFO L471 AbstractCegarLoop]: Abstraction has has 179 places, 161 transitions, 1520 flow [2025-03-17 14:34:05,995 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 23.0) internal successors, (322), 14 states have internal predecessors, (322), 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 14:34:05,995 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:34:05,995 INFO L206 CegarLoopForPetriNet]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:34:06,001 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2025-03-17 14:34:06,195 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,SelfDestructingSolverStorable27 [2025-03-17 14:34:06,195 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:34:06,196 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:34:06,196 INFO L85 PathProgramCache]: Analyzing trace with hash -2000451902, now seen corresponding path program 3 times [2025-03-17 14:34:06,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:34:06,196 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988879543] [2025-03-17 14:34:06,196 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2025-03-17 14:34:06,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:34:06,202 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 partitioned 27 statements into 5 equivalence classes. [2025-03-17 14:34:06,214 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) and asserted 18 of 27 statements. [2025-03-17 14:34:06,214 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2025-03-17 14:34:06,214 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:34:06,392 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2025-03-17 14:34:06,392 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:34:06,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988879543] [2025-03-17 14:34:06,392 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988879543] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:34:06,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52965951] [2025-03-17 14:34:06,392 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2025-03-17 14:34:06,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:34:06,392 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:34:06,394 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 14:34:06,397 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 14:34:06,447 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 partitioned 27 statements into 5 equivalence classes. [2025-03-17 14:34:06,479 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) and asserted 18 of 27 statements. [2025-03-17 14:34:06,480 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2025-03-17 14:34:06,480 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:34:06,481 INFO L256 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 24 conjuncts are in the unsatisfiable core [2025-03-17 14:34:06,482 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:34:06,488 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 14:34:06,543 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 14:34:06,543 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 18 treesize of output 17 [2025-03-17 14:34:06,554 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2025-03-17 14:34:06,555 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 14:34:06,653 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2025-03-17 14:34:06,654 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:34:06,840 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 65 treesize of output 61 [2025-03-17 14:34:06,925 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2025-03-17 14:34:06,925 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52965951] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:34:06,925 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:34:06,925 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 21 [2025-03-17 14:34:06,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239765462] [2025-03-17 14:34:06,925 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:34:06,925 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2025-03-17 14:34:06,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:34:06,926 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2025-03-17 14:34:06,926 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2025-03-17 14:34:07,528 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 17 out of 64 [2025-03-17 14:34:07,529 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 179 places, 161 transitions, 1520 flow. Second operand has 22 states, 22 states have (on average 19.454545454545453) internal successors, (428), 22 states have internal predecessors, (428), 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 14:34:07,529 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:34:07,529 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 17 of 64 [2025-03-17 14:34:07,529 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2025-03-17 14:34:11,330 INFO L124 PetriNetUnfolderBase]: 26304/37764 cut-off events. [2025-03-17 14:34:11,331 INFO L125 PetriNetUnfolderBase]: For 136946/138846 co-relation queries the response was YES. [2025-03-17 14:34:11,513 INFO L83 FinitePrefix]: Finished finitePrefix Result has 162609 conditions, 37764 events. 26304/37764 cut-off events. For 136946/138846 co-relation queries the response was YES. Maximal size of possible extension queue 940. Compared 241809 event pairs, 2845 based on Foata normal form. 1098/38583 useless extension candidates. Maximal degree in co-relation 138275. Up to 15720 conditions per place. [2025-03-17 14:34:11,652 INFO L140 encePairwiseOnDemand]: 56/64 looper letters, 226 selfloop transitions, 37 changer transitions 0/272 dead transitions. [2025-03-17 14:34:11,652 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 186 places, 272 transitions, 2719 flow [2025-03-17 14:34:11,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2025-03-17 14:34:11,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2025-03-17 14:34:11,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 251 transitions. [2025-03-17 14:34:11,653 INFO L514 CegarLoopForPetriNet]: DFA transition density 0.4357638888888889 [2025-03-17 14:34:11,653 INFO L175 Difference]: Start difference. First operand has 179 places, 161 transitions, 1520 flow. Second operand 9 states and 251 transitions. [2025-03-17 14:34:11,653 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 186 places, 272 transitions, 2719 flow [2025-03-17 14:34:12,039 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 179 places, 272 transitions, 2623 flow, removed 0 selfloop flow, removed 7 redundant places. [2025-03-17 14:34:12,041 INFO L231 Difference]: Finished difference. Result has 179 places, 160 transitions, 1490 flow [2025-03-17 14:34:12,041 INFO L262 CegarLoopForPetriNet]: {PETRI_ALPHABET=64, PETRI_DIFFERENCE_MINUEND_FLOW=1408, PETRI_DIFFERENCE_MINUEND_PLACES=171, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=159, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=36, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=123, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=1490, PETRI_PLACES=179, PETRI_TRANSITIONS=160} [2025-03-17 14:34:12,042 INFO L279 CegarLoopForPetriNet]: 63 programPoint places, 116 predicate places. [2025-03-17 14:34:12,042 INFO L471 AbstractCegarLoop]: Abstraction has has 179 places, 160 transitions, 1490 flow [2025-03-17 14:34:12,042 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 19.454545454545453) internal successors, (428), 22 states have internal predecessors, (428), 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 14:34:12,042 INFO L198 CegarLoopForPetriNet]: Found error trace [2025-03-17 14:34:12,042 INFO L206 CegarLoopForPetriNet]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 14:34:12,048 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 14:34:12,242 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2025-03-17 14:34:12,243 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 32 more)] === [2025-03-17 14:34:12,243 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 14:34:12,243 INFO L85 PathProgramCache]: Analyzing trace with hash 1308989023, now seen corresponding path program 2 times [2025-03-17 14:34:12,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2025-03-17 14:34:12,243 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105190159] [2025-03-17 14:34:12,243 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:34:12,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2025-03-17 14:34:12,251 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 27 statements into 2 equivalence classes. [2025-03-17 14:34:12,266 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 27 of 27 statements. [2025-03-17 14:34:12,267 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:34:12,267 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:34:12,355 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:34:12,355 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2025-03-17 14:34:12,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105190159] [2025-03-17 14:34:12,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105190159] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 14:34:12,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444846211] [2025-03-17 14:34:12,356 INFO L95 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2025-03-17 14:34:12,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 14:34:12,356 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 14:34:12,358 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 14:34:12,360 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 14:34:12,415 INFO L108 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 27 statements into 2 equivalence classes. [2025-03-17 14:34:12,437 INFO L111 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 27 of 27 statements. [2025-03-17 14:34:12,438 INFO L114 AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2025-03-17 14:34:12,438 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 14:34:12,439 INFO L256 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 10 conjuncts are in the unsatisfiable core [2025-03-17 14:34:12,439 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 14:34:12,528 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:34:12,528 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 14:34:12,603 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2025-03-17 14:34:12,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444846211] provided 0 perfect and 2 imperfect interpolant sequences [2025-03-17 14:34:12,604 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2025-03-17 14:34:12,604 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2025-03-17 14:34:12,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581077435] [2025-03-17 14:34:12,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2025-03-17 14:34:12,604 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2025-03-17 14:34:12,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2025-03-17 14:34:12,605 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2025-03-17 14:34:12,605 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2025-03-17 14:34:12,725 INFO L469 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 64 [2025-03-17 14:34:12,725 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 179 places, 160 transitions, 1490 flow. Second operand has 19 states, 19 states have (on average 22.36842105263158) internal successors, (425), 19 states have internal predecessors, (425), 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 14:34:12,725 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2025-03-17 14:34:12,725 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 64 [2025-03-17 14:34:12,725 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand