./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety/test-0137.i --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/memsafety/test-0137.i -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 1c2d362b3c58f37a9b1e964b448eb3d54c85d26676417295a73853b3a7cc716a --- Real Ultimate output --- This is Ultimate 0.3.0-?-8fc3dc6-m [2025-03-17 11:55:13,397 INFO L188 SettingsManager]: Resetting all preferences to default values... [2025-03-17 11:55:13,446 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2025-03-17 11:55:13,452 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2025-03-17 11:55:13,452 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2025-03-17 11:55:13,472 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2025-03-17 11:55:13,473 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2025-03-17 11:55:13,473 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2025-03-17 11:55:13,473 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2025-03-17 11:55:13,473 INFO L153 SettingsManager]: * Use memory slicer=true [2025-03-17 11:55:13,474 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2025-03-17 11:55:13,474 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2025-03-17 11:55:13,474 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2025-03-17 11:55:13,474 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2025-03-17 11:55:13,474 INFO L153 SettingsManager]: * Use SBE=true [2025-03-17 11:55:13,474 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2025-03-17 11:55:13,474 INFO L153 SettingsManager]: * sizeof long=4 [2025-03-17 11:55:13,474 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2025-03-17 11:55:13,474 INFO L153 SettingsManager]: * sizeof POINTER=4 [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * sizeof long double=12 [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Use constant arrays=true [2025-03-17 11:55:13,475 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 11:55:13,475 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2025-03-17 11:55:13,475 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2025-03-17 11:55:13,476 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2025-03-17 11:55:13,476 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2025-03-17 11:55:13,476 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2025-03-17 11:55:13,476 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2025-03-17 11:55:13,476 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2025-03-17 11:55:13,476 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2025-03-17 11:55:13,476 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 -> 1c2d362b3c58f37a9b1e964b448eb3d54c85d26676417295a73853b3a7cc716a [2025-03-17 11:55:13,702 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2025-03-17 11:55:13,709 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2025-03-17 11:55:13,711 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2025-03-17 11:55:13,712 INFO L270 PluginConnector]: Initializing CDTParser... [2025-03-17 11:55:13,712 INFO L274 PluginConnector]: CDTParser initialized [2025-03-17 11:55:13,713 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety/test-0137.i [2025-03-17 11:55:14,816 INFO L533 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/adbf3d2d6/6771025ba24c41a08a38f798629271de/FLAGc214f6761 [2025-03-17 11:55:15,063 INFO L384 CDTParser]: Found 1 translation units. [2025-03-17 11:55:15,064 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety/test-0137.i [2025-03-17 11:55:15,077 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/adbf3d2d6/6771025ba24c41a08a38f798629271de/FLAGc214f6761 [2025-03-17 11:55:15,371 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/adbf3d2d6/6771025ba24c41a08a38f798629271de [2025-03-17 11:55:15,376 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2025-03-17 11:55:15,377 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2025-03-17 11:55:15,378 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2025-03-17 11:55:15,378 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2025-03-17 11:55:15,381 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2025-03-17 11:55:15,381 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 11:55:15" (1/1) ... [2025-03-17 11:55:15,383 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60989ab4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:15, skipping insertion in model container [2025-03-17 11:55:15,383 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 11:55:15" (1/1) ... [2025-03-17 11:55:15,401 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-03-17 11:55:15,637 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 11:55:15,646 ERROR L321 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2025-03-17 11:55:15,647 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@3da9f758 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:15, skipping insertion in model container [2025-03-17 11:55:15,647 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2025-03-17 11:55:15,647 INFO L186 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2025-03-17 11:55:15,649 INFO L158 Benchmark]: Toolchain (without parser) took 271.41ms. Allocated memory is still 167.8MB. Free memory was 122.1MB in the beginning and 109.3MB in the end (delta: 12.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2025-03-17 11:55:15,650 INFO L158 Benchmark]: CDTParser took 0.23ms. Allocated memory is still 209.7MB. Free memory is still 127.5MB. There was no memory consumed. Max. memory is 16.1GB. [2025-03-17 11:55:15,650 INFO L158 Benchmark]: CACSL2BoogieTranslator took 269.51ms. Allocated memory is still 167.8MB. Free memory was 121.7MB in the beginning and 109.3MB in the end (delta: 12.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2025-03-17 11:55:15,651 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23ms. Allocated memory is still 209.7MB. Free memory is still 127.5MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 269.51ms. Allocated memory is still 167.8MB. Free memory was 121.7MB in the beginning and 109.3MB in the end (delta: 12.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 585]: Unsupported Syntax Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### 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/memsafety/test-0137.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.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 1c2d362b3c58f37a9b1e964b448eb3d54c85d26676417295a73853b3a7cc716a --- Real Ultimate output --- This is Ultimate 0.3.0-?-8fc3dc6-m [2025-03-17 11:55:17,269 INFO L188 SettingsManager]: Resetting all preferences to default values... [2025-03-17 11:55:17,333 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2025-03-17 11:55:17,342 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2025-03-17 11:55:17,343 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2025-03-17 11:55:17,368 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2025-03-17 11:55:17,369 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2025-03-17 11:55:17,369 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2025-03-17 11:55:17,369 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2025-03-17 11:55:17,370 INFO L153 SettingsManager]: * Use memory slicer=true [2025-03-17 11:55:17,370 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2025-03-17 11:55:17,370 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2025-03-17 11:55:17,370 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2025-03-17 11:55:17,370 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2025-03-17 11:55:17,370 INFO L153 SettingsManager]: * Use SBE=true [2025-03-17 11:55:17,370 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * sizeof long=4 [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * sizeof POINTER=4 [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * sizeof long double=12 [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Behaviour of calls to undefined functions=OVERAPPROXIMATE_BEHAVIOUR [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Use constant arrays=true [2025-03-17 11:55:17,371 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2025-03-17 11:55:17,371 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 11:55:17,372 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2025-03-17 11:55:17,372 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2025-03-17 11:55:17,372 INFO L153 SettingsManager]: * Trace refinement strategy=FOX [2025-03-17 11:55:17,372 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2025-03-17 11:55:17,372 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2025-03-17 11:55:17,372 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2025-03-17 11:55:17,372 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2025-03-17 11:55:17,372 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2025-03-17 11:55:17,372 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 -> 1c2d362b3c58f37a9b1e964b448eb3d54c85d26676417295a73853b3a7cc716a [2025-03-17 11:55:17,613 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2025-03-17 11:55:17,618 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2025-03-17 11:55:17,619 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2025-03-17 11:55:17,620 INFO L270 PluginConnector]: Initializing CDTParser... [2025-03-17 11:55:17,620 INFO L274 PluginConnector]: CDTParser initialized [2025-03-17 11:55:17,621 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety/test-0137.i [2025-03-17 11:55:18,113 INFO L533 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3bdfb2cf0/b967f4c842cf49569a5ef49080a880bd/FLAGd4bcfe56e [2025-03-17 11:55:19,638 INFO L384 CDTParser]: Found 1 translation units. [2025-03-17 11:55:19,639 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety/test-0137.i [2025-03-17 11:55:19,648 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3bdfb2cf0/b967f4c842cf49569a5ef49080a880bd/FLAGd4bcfe56e [2025-03-17 11:55:19,659 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3bdfb2cf0/b967f4c842cf49569a5ef49080a880bd [2025-03-17 11:55:19,661 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2025-03-17 11:55:19,662 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2025-03-17 11:55:19,664 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2025-03-17 11:55:19,664 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2025-03-17 11:55:19,667 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2025-03-17 11:55:19,668 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:19,668 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1336da8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19, skipping insertion in model container [2025-03-17 11:55:19,669 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:19,688 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-03-17 11:55:19,857 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 11:55:19,872 INFO L197 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2025-03-17 11:55:19,878 INFO L175 MainTranslator]: Built tables and reachable declarations [2025-03-17 11:55:19,904 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 11:55:19,911 INFO L200 MainTranslator]: Completed pre-run [2025-03-17 11:55:19,947 INFO L210 PostProcessor]: Analyzing one entry point: main [2025-03-17 11:55:19,975 INFO L204 MainTranslator]: Completed translation [2025-03-17 11:55:19,977 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19 WrapperNode [2025-03-17 11:55:19,978 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2025-03-17 11:55:19,979 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2025-03-17 11:55:19,979 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2025-03-17 11:55:19,979 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2025-03-17 11:55:19,983 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,004 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,020 INFO L138 Inliner]: procedures = 140, calls = 60, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 134 [2025-03-17 11:55:20,020 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2025-03-17 11:55:20,021 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2025-03-17 11:55:20,021 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2025-03-17 11:55:20,021 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2025-03-17 11:55:20,027 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,027 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,032 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,056 INFO L175 MemorySlicer]: Split 32 memory accesses to 2 slices as follows [30, 2]. 94 percent of accesses are in the largest equivalence class. The 6 initializations are split as follows [4, 2]. The 12 writes are split as follows [12, 0]. [2025-03-17 11:55:20,060 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,060 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,069 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,074 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,075 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,079 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,081 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2025-03-17 11:55:20,085 INFO L112 PluginConnector]: ------------------------IcfgBuilder---------------------------- [2025-03-17 11:55:20,085 INFO L270 PluginConnector]: Initializing IcfgBuilder... [2025-03-17 11:55:20,085 INFO L274 PluginConnector]: IcfgBuilder initialized [2025-03-17 11:55:20,086 INFO L184 PluginConnector]: Executing the observer IcfgBuilderObserver from plugin IcfgBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (1/1) ... [2025-03-17 11:55:20,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2025-03-17 11:55:20,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:20,115 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 11:55:20,117 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 11:55:20,138 INFO L130 BoogieDeclarations]: Found specification of procedure list_empty [2025-03-17 11:55:20,140 INFO L138 BoogieDeclarations]: Found implementation of procedure list_empty [2025-03-17 11:55:20,140 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4#0 [2025-03-17 11:55:20,140 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4#1 [2025-03-17 11:55:20,140 INFO L130 BoogieDeclarations]: Found specification of procedure __list_del [2025-03-17 11:55:20,141 INFO L138 BoogieDeclarations]: Found implementation of procedure __list_del [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#0 [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#1 [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#0 [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#1 [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure list_add [2025-03-17 11:55:20,141 INFO L138 BoogieDeclarations]: Found implementation of procedure list_add [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4#0 [2025-03-17 11:55:20,141 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4#1 [2025-03-17 11:55:20,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$#0 [2025-03-17 11:55:20,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$#1 [2025-03-17 11:55:20,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1#0 [2025-03-17 11:55:20,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1#1 [2025-03-17 11:55:20,142 INFO L130 BoogieDeclarations]: Found specification of procedure val_from_node [2025-03-17 11:55:20,142 INFO L138 BoogieDeclarations]: Found implementation of procedure val_from_node [2025-03-17 11:55:20,143 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2025-03-17 11:55:20,143 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2025-03-17 11:55:20,257 INFO L256 CfgBuilder]: Building ICFG [2025-03-17 11:55:20,258 INFO L286 CfgBuilder]: Building CFG for each procedure with an implementation [2025-03-17 11:55:20,302 INFO L1322 $ProcedureCfgBuilder]: dead code at ProgramPoint L590: havoc #t~mem14; [2025-03-17 11:55:20,318 INFO L1322 $ProcedureCfgBuilder]: dead code at ProgramPoint L529: havoc #t~mem3.base, #t~mem3.offset; [2025-03-17 11:55:20,666 INFO L? ?]: Removed 139 outVars from TransFormulas that were not future-live. [2025-03-17 11:55:20,666 INFO L307 CfgBuilder]: Performing block encoding [2025-03-17 11:55:20,677 INFO L331 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2025-03-17 11:55:20,677 INFO L336 CfgBuilder]: Removed 0 assume(true) statements. [2025-03-17 11:55:20,678 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.03 11:55:20 BoogieIcfgContainer [2025-03-17 11:55:20,678 INFO L131 PluginConnector]: ------------------------ END IcfgBuilder---------------------------- [2025-03-17 11:55:20,679 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2025-03-17 11:55:20,679 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2025-03-17 11:55:20,683 INFO L274 PluginConnector]: TraceAbstraction initialized [2025-03-17 11:55:20,683 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.03 11:55:19" (1/3) ... [2025-03-17 11:55:20,684 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fad8056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 11:55:20, skipping insertion in model container [2025-03-17 11:55:20,685 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 11:55:19" (2/3) ... [2025-03-17 11:55:20,685 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fad8056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 11:55:20, skipping insertion in model container [2025-03-17 11:55:20,686 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.03 11:55:20" (3/3) ... [2025-03-17 11:55:20,687 INFO L128 eAbstractionObserver]: Analyzing ICFG test-0137.i [2025-03-17 11:55:20,697 INFO L216 ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2025-03-17 11:55:20,698 INFO L151 ceAbstractionStarter]: Applying trace abstraction to ICFG test-0137.i that has 5 procedures, 139 locations, 1 initial locations, 4 loop locations, and 56 error locations. [2025-03-17 11:55:20,731 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2025-03-17 11:55:20,742 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;@34e6e9aa, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2025-03-17 11:55:20,743 INFO L334 AbstractCegarLoop]: Starting to check reachability of 56 error locations. [2025-03-17 11:55:20,748 INFO L276 IsEmpty]: Start isEmpty. Operand has 139 states, 71 states have (on average 1.943661971830986) internal successors, (138), 127 states have internal predecessors, (138), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2025-03-17 11:55:20,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2025-03-17 11:55:20,751 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:20,752 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2025-03-17 11:55:20,752 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr36REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:20,755 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:20,755 INFO L85 PathProgramCache]: Analyzing trace with hash 5692989, now seen corresponding path program 1 times [2025-03-17 11:55:20,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:20,761 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1627345471] [2025-03-17 11:55:20,761 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:20,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:20,762 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:20,764 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 11:55:20,765 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 11:55:20,829 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 4 statements into 1 equivalence classes. [2025-03-17 11:55:20,837 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 4 of 4 statements. [2025-03-17 11:55:20,837 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:20,838 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:20,839 INFO L256 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 1 conjuncts are in the unsatisfiable core [2025-03-17 11:55:20,844 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:20,854 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 11:55:20,855 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:20,855 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:20,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627345471] [2025-03-17 11:55:20,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627345471] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:20,855 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:20,856 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-03-17 11:55:20,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663136166] [2025-03-17 11:55:20,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:20,861 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2025-03-17 11:55:20,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:20,876 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2025-03-17 11:55:20,876 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2025-03-17 11:55:20,879 INFO L87 Difference]: Start difference. First operand has 139 states, 71 states have (on average 1.943661971830986) internal successors, (138), 127 states have internal predecessors, (138), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 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 11:55:20,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:20,893 INFO L93 Difference]: Finished difference Result 139 states and 148 transitions. [2025-03-17 11:55:20,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2025-03-17 11:55:20,894 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 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) Word has length 4 [2025-03-17 11:55:20,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:20,899 INFO L225 Difference]: With dead ends: 139 [2025-03-17 11:55:20,900 INFO L226 Difference]: Without dead ends: 137 [2025-03-17 11:55:20,902 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2025-03-17 11:55:20,904 INFO L435 NwaCegarLoop]: 148 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:20,906 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2025-03-17 11:55:20,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2025-03-17 11:55:20,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2025-03-17 11:55:20,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 70 states have (on average 1.8857142857142857) internal successors, (132), 125 states have internal predecessors, (132), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2025-03-17 11:55:20,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 146 transitions. [2025-03-17 11:55:20,939 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 146 transitions. Word has length 4 [2025-03-17 11:55:20,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:20,939 INFO L471 AbstractCegarLoop]: Abstraction has 137 states and 146 transitions. [2025-03-17 11:55:20,939 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 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 11:55:20,939 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 146 transitions. [2025-03-17 11:55:20,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2025-03-17 11:55:20,939 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:20,939 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2025-03-17 11:55:20,946 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2025-03-17 11:55:21,140 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:21,140 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr36REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:21,141 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:21,141 INFO L85 PathProgramCache]: Analyzing trace with hash 5693020, now seen corresponding path program 1 times [2025-03-17 11:55:21,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:21,141 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1656223607] [2025-03-17 11:55:21,141 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:21,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:21,141 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:21,143 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 11:55:21,145 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 11:55:21,191 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 4 statements into 1 equivalence classes. [2025-03-17 11:55:21,196 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 4 of 4 statements. [2025-03-17 11:55:21,196 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:21,196 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:21,197 INFO L256 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 3 conjuncts are in the unsatisfiable core [2025-03-17 11:55:21,198 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:21,225 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 7 [2025-03-17 11:55:21,236 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 11:55:21,237 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:21,237 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:21,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1656223607] [2025-03-17 11:55:21,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1656223607] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:21,237 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:21,237 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-03-17 11:55:21,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42021723] [2025-03-17 11:55:21,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:21,238 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2025-03-17 11:55:21,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:21,238 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2025-03-17 11:55:21,238 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2025-03-17 11:55:21,238 INFO L87 Difference]: Start difference. First operand 137 states and 146 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 11:55:21,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:21,351 INFO L93 Difference]: Finished difference Result 136 states and 145 transitions. [2025-03-17 11:55:21,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2025-03-17 11:55:21,351 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) Word has length 4 [2025-03-17 11:55:21,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:21,352 INFO L225 Difference]: With dead ends: 136 [2025-03-17 11:55:21,352 INFO L226 Difference]: Without dead ends: 136 [2025-03-17 11:55:21,352 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2025-03-17 11:55:21,353 INFO L435 NwaCegarLoop]: 142 mSDtfsCounter, 1 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:21,353 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 224 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2025-03-17 11:55:21,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2025-03-17 11:55:21,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2025-03-17 11:55:21,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 70 states have (on average 1.8714285714285714) internal successors, (131), 124 states have internal predecessors, (131), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2025-03-17 11:55:21,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 145 transitions. [2025-03-17 11:55:21,363 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 145 transitions. Word has length 4 [2025-03-17 11:55:21,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:21,363 INFO L471 AbstractCegarLoop]: Abstraction has 136 states and 145 transitions. [2025-03-17 11:55:21,363 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 11:55:21,363 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 145 transitions. [2025-03-17 11:55:21,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2025-03-17 11:55:21,364 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:21,364 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2025-03-17 11:55:21,371 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2025-03-17 11:55:21,564 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:21,564 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr37REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:21,565 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:21,565 INFO L85 PathProgramCache]: Analyzing trace with hash 5693021, now seen corresponding path program 1 times [2025-03-17 11:55:21,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:21,565 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [466256618] [2025-03-17 11:55:21,565 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:21,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:21,565 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:21,567 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 11:55:21,568 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 11:55:21,612 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 4 statements into 1 equivalence classes. [2025-03-17 11:55:21,618 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 4 of 4 statements. [2025-03-17 11:55:21,619 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:21,619 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:21,619 INFO L256 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjuncts are in the unsatisfiable core [2025-03-17 11:55:21,620 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:21,629 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 11:55:21,643 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 11:55:21,643 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:21,643 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:21,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466256618] [2025-03-17 11:55:21,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466256618] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:21,644 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:21,644 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2025-03-17 11:55:21,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840489137] [2025-03-17 11:55:21,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:21,644 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2025-03-17 11:55:21,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:21,645 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2025-03-17 11:55:21,645 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2025-03-17 11:55:21,645 INFO L87 Difference]: Start difference. First operand 136 states and 145 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 11:55:21,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:21,779 INFO L93 Difference]: Finished difference Result 135 states and 144 transitions. [2025-03-17 11:55:21,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2025-03-17 11:55:21,780 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) Word has length 4 [2025-03-17 11:55:21,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:21,780 INFO L225 Difference]: With dead ends: 135 [2025-03-17 11:55:21,781 INFO L226 Difference]: Without dead ends: 135 [2025-03-17 11:55:21,781 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2025-03-17 11:55:21,782 INFO L435 NwaCegarLoop]: 142 mSDtfsCounter, 1 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:21,782 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 228 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2025-03-17 11:55:21,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2025-03-17 11:55:21,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2025-03-17 11:55:21,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 70 states have (on average 1.8571428571428572) internal successors, (130), 123 states have internal predecessors, (130), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2025-03-17 11:55:21,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 144 transitions. [2025-03-17 11:55:21,792 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 144 transitions. Word has length 4 [2025-03-17 11:55:21,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:21,792 INFO L471 AbstractCegarLoop]: Abstraction has 135 states and 144 transitions. [2025-03-17 11:55:21,792 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 11:55:21,793 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 144 transitions. [2025-03-17 11:55:21,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2025-03-17 11:55:21,793 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:21,793 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:21,800 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 11:55:21,993 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:21,994 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting list_addErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:21,994 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:21,994 INFO L85 PathProgramCache]: Analyzing trace with hash 2097168140, now seen corresponding path program 1 times [2025-03-17 11:55:21,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:21,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [711167070] [2025-03-17 11:55:21,994 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:21,995 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:21,995 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:21,996 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 11:55:21,997 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 11:55:22,064 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 7 statements into 1 equivalence classes. [2025-03-17 11:55:22,075 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 7 of 7 statements. [2025-03-17 11:55:22,075 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:22,075 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:22,077 INFO L256 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjuncts are in the unsatisfiable core [2025-03-17 11:55:22,078 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:22,117 INFO L349 Elim1Store]: treesize reduction 24, result has 33.3 percent of original size [2025-03-17 11:55:22,118 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 21 treesize of output 20 [2025-03-17 11:55:22,158 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 11:55:22,158 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:22,158 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:22,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711167070] [2025-03-17 11:55:22,159 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711167070] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:22,159 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:22,159 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 11:55:22,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173725614] [2025-03-17 11:55:22,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:22,159 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2025-03-17 11:55:22,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:22,160 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2025-03-17 11:55:22,160 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2025-03-17 11:55:22,160 INFO L87 Difference]: Start difference. First operand 135 states and 144 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:22,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:22,444 INFO L93 Difference]: Finished difference Result 171 states and 179 transitions. [2025-03-17 11:55:22,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2025-03-17 11:55:22,444 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2025-03-17 11:55:22,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:22,445 INFO L225 Difference]: With dead ends: 171 [2025-03-17 11:55:22,445 INFO L226 Difference]: Without dead ends: 171 [2025-03-17 11:55:22,446 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2025-03-17 11:55:22,446 INFO L435 NwaCegarLoop]: 76 mSDtfsCounter, 168 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:22,446 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 211 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2025-03-17 11:55:22,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2025-03-17 11:55:22,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 148. [2025-03-17 11:55:22,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 85 states have (on average 1.8352941176470587) internal successors, (156), 135 states have internal predecessors, (156), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2025-03-17 11:55:22,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 170 transitions. [2025-03-17 11:55:22,456 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 170 transitions. Word has length 7 [2025-03-17 11:55:22,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:22,456 INFO L471 AbstractCegarLoop]: Abstraction has 148 states and 170 transitions. [2025-03-17 11:55:22,456 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:22,456 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 170 transitions. [2025-03-17 11:55:22,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2025-03-17 11:55:22,456 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:22,456 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:22,464 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 11:55:22,657 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:22,657 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting list_addErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:22,657 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:22,658 INFO L85 PathProgramCache]: Analyzing trace with hash 2097168141, now seen corresponding path program 1 times [2025-03-17 11:55:22,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:22,658 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1114732516] [2025-03-17 11:55:22,658 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:22,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:22,658 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:22,660 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 11:55:22,661 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 11:55:22,712 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 7 statements into 1 equivalence classes. [2025-03-17 11:55:22,723 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 7 of 7 statements. [2025-03-17 11:55:22,723 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:22,723 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:22,725 INFO L256 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 11 conjuncts are in the unsatisfiable core [2025-03-17 11:55:22,727 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:22,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 11:55:22,779 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 14 treesize of output 9 [2025-03-17 11:55:22,835 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 11:55:22,835 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:22,835 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:22,836 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114732516] [2025-03-17 11:55:22,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114732516] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:22,836 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:22,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2025-03-17 11:55:22,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787633064] [2025-03-17 11:55:22,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:22,836 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-03-17 11:55:22,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:22,837 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-03-17 11:55:22,837 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2025-03-17 11:55:22,837 INFO L87 Difference]: Start difference. First operand 148 states and 170 transitions. Second operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:23,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:23,177 INFO L93 Difference]: Finished difference Result 150 states and 161 transitions. [2025-03-17 11:55:23,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 11:55:23,177 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2025-03-17 11:55:23,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:23,178 INFO L225 Difference]: With dead ends: 150 [2025-03-17 11:55:23,178 INFO L226 Difference]: Without dead ends: 150 [2025-03-17 11:55:23,178 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2025-03-17 11:55:23,179 INFO L435 NwaCegarLoop]: 55 mSDtfsCounter, 167 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:23,179 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 143 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2025-03-17 11:55:23,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2025-03-17 11:55:23,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 138. [2025-03-17 11:55:23,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 81 states have (on average 1.728395061728395) internal successors, (140), 125 states have internal predecessors, (140), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2025-03-17 11:55:23,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 154 transitions. [2025-03-17 11:55:23,184 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 154 transitions. Word has length 7 [2025-03-17 11:55:23,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:23,184 INFO L471 AbstractCegarLoop]: Abstraction has 138 states and 154 transitions. [2025-03-17 11:55:23,184 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:23,184 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 154 transitions. [2025-03-17 11:55:23,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2025-03-17 11:55:23,184 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:23,184 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:23,191 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 11:55:23,385 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 [2025-03-17 11:55:23,385 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting list_addErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:23,386 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:23,386 INFO L85 PathProgramCache]: Analyzing trace with hash 1038920873, now seen corresponding path program 1 times [2025-03-17 11:55:23,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:23,386 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2049953030] [2025-03-17 11:55:23,386 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:23,386 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:23,386 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:23,389 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 11:55:23,390 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 11:55:23,431 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 9 statements into 1 equivalence classes. [2025-03-17 11:55:23,444 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 9 of 9 statements. [2025-03-17 11:55:23,444 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:23,444 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:23,446 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 16 conjuncts are in the unsatisfiable core [2025-03-17 11:55:23,447 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:23,476 INFO L349 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2025-03-17 11:55:23,476 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 13 treesize of output 13 [2025-03-17 11:55:23,522 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11:55:23,589 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 11:55:23,589 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:23,589 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:23,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049953030] [2025-03-17 11:55:23,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2049953030] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:23,590 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:23,590 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2025-03-17 11:55:23,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520006762] [2025-03-17 11:55:23,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:23,590 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2025-03-17 11:55:23,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:23,591 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2025-03-17 11:55:23,591 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2025-03-17 11:55:23,591 INFO L87 Difference]: Start difference. First operand 138 states and 154 transitions. Second operand has 9 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:24,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:24,013 INFO L93 Difference]: Finished difference Result 150 states and 167 transitions. [2025-03-17 11:55:24,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2025-03-17 11:55:24,013 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2025-03-17 11:55:24,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:24,015 INFO L225 Difference]: With dead ends: 150 [2025-03-17 11:55:24,015 INFO L226 Difference]: Without dead ends: 150 [2025-03-17 11:55:24,015 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2025-03-17 11:55:24,016 INFO L435 NwaCegarLoop]: 125 mSDtfsCounter, 13 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 649 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:24,016 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 649 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2025-03-17 11:55:24,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2025-03-17 11:55:24,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 146. [2025-03-17 11:55:24,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 88 states have (on average 1.6818181818181819) internal successors, (148), 132 states have internal predecessors, (148), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:24,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 164 transitions. [2025-03-17 11:55:24,026 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 164 transitions. Word has length 9 [2025-03-17 11:55:24,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:24,027 INFO L471 AbstractCegarLoop]: Abstraction has 146 states and 164 transitions. [2025-03-17 11:55:24,027 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:24,027 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 164 transitions. [2025-03-17 11:55:24,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2025-03-17 11:55:24,027 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:24,027 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:24,033 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2025-03-17 11:55:24,227 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:24,228 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting list_addErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:24,228 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:24,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1038920874, now seen corresponding path program 1 times [2025-03-17 11:55:24,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:24,229 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1886771791] [2025-03-17 11:55:24,229 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:24,229 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:24,229 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:24,231 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 11:55:24,232 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 11:55:24,275 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 9 statements into 1 equivalence classes. [2025-03-17 11:55:24,289 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 9 of 9 statements. [2025-03-17 11:55:24,289 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:24,289 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:24,291 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 25 conjuncts are in the unsatisfiable core [2025-03-17 11:55:24,293 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:24,358 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2025-03-17 11:55:24,359 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 14 treesize of output 13 [2025-03-17 11:55:24,375 INFO L349 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2025-03-17 11:55:24,376 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 13 treesize of output 13 [2025-03-17 11:55:24,439 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11:55:24,446 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11:55:24,575 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 11:55:24,576 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:24,576 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:24,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886771791] [2025-03-17 11:55:24,576 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886771791] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:24,576 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:24,576 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2025-03-17 11:55:24,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842461844] [2025-03-17 11:55:24,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:24,577 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2025-03-17 11:55:24,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:24,577 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2025-03-17 11:55:24,577 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2025-03-17 11:55:24,577 INFO L87 Difference]: Start difference. First operand 146 states and 164 transitions. Second operand has 9 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:25,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:25,173 INFO L93 Difference]: Finished difference Result 152 states and 169 transitions. [2025-03-17 11:55:25,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 11:55:25,174 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2025-03-17 11:55:25,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:25,175 INFO L225 Difference]: With dead ends: 152 [2025-03-17 11:55:25,175 INFO L226 Difference]: Without dead ends: 152 [2025-03-17 11:55:25,175 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2025-03-17 11:55:25,175 INFO L435 NwaCegarLoop]: 122 mSDtfsCounter, 19 mSDsluCounter, 449 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:25,176 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 571 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2025-03-17 11:55:25,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2025-03-17 11:55:25,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 146. [2025-03-17 11:55:25,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 88 states have (on average 1.6704545454545454) internal successors, (147), 132 states have internal predecessors, (147), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:25,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 163 transitions. [2025-03-17 11:55:25,180 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 163 transitions. Word has length 9 [2025-03-17 11:55:25,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:25,180 INFO L471 AbstractCegarLoop]: Abstraction has 146 states and 163 transitions. [2025-03-17 11:55:25,180 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:25,180 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 163 transitions. [2025-03-17 11:55:25,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2025-03-17 11:55:25,181 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:25,181 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:25,187 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 11:55:25,385 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:25,385 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting list_addErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:25,385 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:25,385 INFO L85 PathProgramCache]: Analyzing trace with hash 2141775990, now seen corresponding path program 1 times [2025-03-17 11:55:25,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:25,386 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [332888994] [2025-03-17 11:55:25,386 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:25,386 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:25,386 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:25,387 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 11:55:25,388 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 11:55:25,432 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 10 statements into 1 equivalence classes. [2025-03-17 11:55:25,444 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 10 of 10 statements. [2025-03-17 11:55:25,444 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:25,444 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:25,446 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjuncts are in the unsatisfiable core [2025-03-17 11:55:25,447 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:25,470 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 11:55:25,471 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:25,471 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:25,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332888994] [2025-03-17 11:55:25,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332888994] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:25,471 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:25,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2025-03-17 11:55:25,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030965463] [2025-03-17 11:55:25,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:25,471 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-03-17 11:55:25,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:25,471 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-03-17 11:55:25,471 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2025-03-17 11:55:25,471 INFO L87 Difference]: Start difference. First operand 146 states and 163 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:25,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:25,733 INFO L93 Difference]: Finished difference Result 151 states and 160 transitions. [2025-03-17 11:55:25,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 11:55:25,733 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2025-03-17 11:55:25,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:25,734 INFO L225 Difference]: With dead ends: 151 [2025-03-17 11:55:25,734 INFO L226 Difference]: Without dead ends: 151 [2025-03-17 11:55:25,734 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2025-03-17 11:55:25,734 INFO L435 NwaCegarLoop]: 120 mSDtfsCounter, 25 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:25,734 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 414 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2025-03-17 11:55:25,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2025-03-17 11:55:25,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2025-03-17 11:55:25,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 88 states have (on average 1.6363636363636365) internal successors, (144), 131 states have internal predecessors, (144), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:25,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 160 transitions. [2025-03-17 11:55:25,738 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 160 transitions. Word has length 10 [2025-03-17 11:55:25,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:25,739 INFO L471 AbstractCegarLoop]: Abstraction has 145 states and 160 transitions. [2025-03-17 11:55:25,739 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:25,739 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 160 transitions. [2025-03-17 11:55:25,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2025-03-17 11:55:25,739 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:25,739 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:25,745 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2025-03-17 11:55:25,942 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 [2025-03-17 11:55:25,943 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting list_addErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:25,943 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:25,943 INFO L85 PathProgramCache]: Analyzing trace with hash 2141775991, now seen corresponding path program 1 times [2025-03-17 11:55:25,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:25,943 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2070081064] [2025-03-17 11:55:25,943 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:25,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:25,943 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:25,946 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 11:55:25,947 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 11:55:26,000 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 10 statements into 1 equivalence classes. [2025-03-17 11:55:26,013 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 10 of 10 statements. [2025-03-17 11:55:26,013 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:26,013 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:26,014 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 12 conjuncts are in the unsatisfiable core [2025-03-17 11:55:26,015 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:26,023 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 11:55:26,079 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 11:55:26,079 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:26,080 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:26,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070081064] [2025-03-17 11:55:26,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070081064] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:26,080 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:26,080 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2025-03-17 11:55:26,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241424123] [2025-03-17 11:55:26,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:26,080 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2025-03-17 11:55:26,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:26,081 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2025-03-17 11:55:26,081 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2025-03-17 11:55:26,081 INFO L87 Difference]: Start difference. First operand 145 states and 160 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:26,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:26,370 INFO L93 Difference]: Finished difference Result 149 states and 158 transitions. [2025-03-17 11:55:26,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2025-03-17 11:55:26,371 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2025-03-17 11:55:26,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:26,371 INFO L225 Difference]: With dead ends: 149 [2025-03-17 11:55:26,371 INFO L226 Difference]: Without dead ends: 149 [2025-03-17 11:55:26,371 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2025-03-17 11:55:26,372 INFO L435 NwaCegarLoop]: 122 mSDtfsCounter, 19 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 439 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:26,372 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 439 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2025-03-17 11:55:26,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2025-03-17 11:55:26,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 145. [2025-03-17 11:55:26,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 88 states have (on average 1.6136363636363635) internal successors, (142), 131 states have internal predecessors, (142), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:26,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 158 transitions. [2025-03-17 11:55:26,377 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 158 transitions. Word has length 10 [2025-03-17 11:55:26,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:26,377 INFO L471 AbstractCegarLoop]: Abstraction has 145 states and 158 transitions. [2025-03-17 11:55:26,377 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:26,377 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 158 transitions. [2025-03-17 11:55:26,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2025-03-17 11:55:26,378 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:26,378 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:26,384 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2025-03-17 11:55:26,578 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 [2025-03-17 11:55:26,579 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting list_addErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:26,579 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:26,579 INFO L85 PathProgramCache]: Analyzing trace with hash 957391475, now seen corresponding path program 1 times [2025-03-17 11:55:26,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:26,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [269479702] [2025-03-17 11:55:26,579 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:26,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:26,580 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:26,581 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 11:55:26,582 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 11:55:26,635 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 12 statements into 1 equivalence classes. [2025-03-17 11:55:26,649 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 12 of 12 statements. [2025-03-17 11:55:26,649 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:26,649 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:26,651 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 4 conjuncts are in the unsatisfiable core [2025-03-17 11:55:26,653 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:26,664 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 11:55:26,665 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:26,665 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:26,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269479702] [2025-03-17 11:55:26,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269479702] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:26,665 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:26,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 11:55:26,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874876720] [2025-03-17 11:55:26,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:26,665 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-17 11:55:26,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:26,666 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-17 11:55:26,666 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-17 11:55:26,666 INFO L87 Difference]: Start difference. First operand 145 states and 158 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:26,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:26,791 INFO L93 Difference]: Finished difference Result 144 states and 156 transitions. [2025-03-17 11:55:26,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-03-17 11:55:26,791 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2025-03-17 11:55:26,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:26,792 INFO L225 Difference]: With dead ends: 144 [2025-03-17 11:55:26,792 INFO L226 Difference]: Without dead ends: 144 [2025-03-17 11:55:26,792 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2025-03-17 11:55:26,793 INFO L435 NwaCegarLoop]: 125 mSDtfsCounter, 5 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:26,793 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 277 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2025-03-17 11:55:26,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2025-03-17 11:55:26,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2025-03-17 11:55:26,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 88 states have (on average 1.5909090909090908) internal successors, (140), 130 states have internal predecessors, (140), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:26,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 156 transitions. [2025-03-17 11:55:26,797 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 156 transitions. Word has length 12 [2025-03-17 11:55:26,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:26,797 INFO L471 AbstractCegarLoop]: Abstraction has 144 states and 156 transitions. [2025-03-17 11:55:26,797 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:26,797 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 156 transitions. [2025-03-17 11:55:26,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2025-03-17 11:55:26,797 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:26,797 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:26,805 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 11:55:26,998 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:26,998 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting list_addErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:26,998 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:26,998 INFO L85 PathProgramCache]: Analyzing trace with hash 957391476, now seen corresponding path program 1 times [2025-03-17 11:55:26,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:26,999 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1499799972] [2025-03-17 11:55:26,999 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:26,999 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:26,999 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:27,000 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 11:55:27,001 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 11:55:27,052 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 12 statements into 1 equivalence classes. [2025-03-17 11:55:27,072 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 12 of 12 statements. [2025-03-17 11:55:27,072 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:27,072 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:27,075 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 9 conjuncts are in the unsatisfiable core [2025-03-17 11:55:27,077 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:27,135 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 11:55:27,135 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:27,135 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:27,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499799972] [2025-03-17 11:55:27,135 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499799972] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:27,135 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:27,135 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2025-03-17 11:55:27,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731534948] [2025-03-17 11:55:27,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:27,136 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 11:55:27,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:27,136 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 11:55:27,136 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2025-03-17 11:55:27,136 INFO L87 Difference]: Start difference. First operand 144 states and 156 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:27,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:27,359 INFO L93 Difference]: Finished difference Result 146 states and 155 transitions. [2025-03-17 11:55:27,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2025-03-17 11:55:27,360 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2025-03-17 11:55:27,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:27,361 INFO L225 Difference]: With dead ends: 146 [2025-03-17 11:55:27,361 INFO L226 Difference]: Without dead ends: 146 [2025-03-17 11:55:27,361 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2025-03-17 11:55:27,361 INFO L435 NwaCegarLoop]: 113 mSDtfsCounter, 152 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:27,362 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 411 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2025-03-17 11:55:27,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2025-03-17 11:55:27,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 144. [2025-03-17 11:55:27,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 88 states have (on average 1.5795454545454546) internal successors, (139), 130 states have internal predecessors, (139), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:27,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2025-03-17 11:55:27,366 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 12 [2025-03-17 11:55:27,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:27,366 INFO L471 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2025-03-17 11:55:27,366 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2025-03-17 11:55:27,366 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2025-03-17 11:55:27,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2025-03-17 11:55:27,367 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:27,367 INFO L218 NwaCegarLoop]: 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 11:55:27,374 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 11:55:27,571 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:27,571 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:27,571 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:27,571 INFO L85 PathProgramCache]: Analyzing trace with hash 1452291099, now seen corresponding path program 1 times [2025-03-17 11:55:27,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:27,572 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [377955619] [2025-03-17 11:55:27,572 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:27,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:27,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:27,573 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 11:55:27,575 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 11:55:27,631 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 11:55:27,647 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 11:55:27,647 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:27,647 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:27,649 INFO L256 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 6 conjuncts are in the unsatisfiable core [2025-03-17 11:55:27,650 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:27,692 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 11:55:27,692 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:27,692 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:27,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377955619] [2025-03-17 11:55:27,692 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377955619] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:27,693 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:27,693 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2025-03-17 11:55:27,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592238420] [2025-03-17 11:55:27,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:27,693 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2025-03-17 11:55:27,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:27,693 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2025-03-17 11:55:27,694 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2025-03-17 11:55:27,694 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2025-03-17 11:55:28,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:28,017 INFO L93 Difference]: Finished difference Result 143 states and 154 transitions. [2025-03-17 11:55:28,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 11:55:28,017 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2025-03-17 11:55:28,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:28,018 INFO L225 Difference]: With dead ends: 143 [2025-03-17 11:55:28,018 INFO L226 Difference]: Without dead ends: 143 [2025-03-17 11:55:28,018 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2025-03-17 11:55:28,019 INFO L435 NwaCegarLoop]: 71 mSDtfsCounter, 136 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:28,019 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 309 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2025-03-17 11:55:28,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2025-03-17 11:55:28,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2025-03-17 11:55:28,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 88 states have (on average 1.5681818181818181) internal successors, (138), 129 states have internal predecessors, (138), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:28,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 154 transitions. [2025-03-17 11:55:28,022 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 154 transitions. Word has length 21 [2025-03-17 11:55:28,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:28,022 INFO L471 AbstractCegarLoop]: Abstraction has 143 states and 154 transitions. [2025-03-17 11:55:28,022 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2025-03-17 11:55:28,022 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 154 transitions. [2025-03-17 11:55:28,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2025-03-17 11:55:28,023 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:28,023 INFO L218 NwaCegarLoop]: 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 11:55:28,029 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2025-03-17 11:55:28,223 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 [2025-03-17 11:55:28,223 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting list_emptyErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:28,224 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:28,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1452291100, now seen corresponding path program 1 times [2025-03-17 11:55:28,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:28,224 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [924685969] [2025-03-17 11:55:28,224 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:28,224 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:28,224 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:28,226 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 11:55:28,227 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 11:55:28,283 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes. [2025-03-17 11:55:28,299 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements. [2025-03-17 11:55:28,300 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:28,300 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:28,302 INFO L256 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 11 conjuncts are in the unsatisfiable core [2025-03-17 11:55:28,303 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:28,418 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 11:55:28,418 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:28,418 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:28,418 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924685969] [2025-03-17 11:55:28,418 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924685969] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:28,418 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:28,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2025-03-17 11:55:28,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787817624] [2025-03-17 11:55:28,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:28,418 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2025-03-17 11:55:28,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:28,419 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2025-03-17 11:55:28,419 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2025-03-17 11:55:28,419 INFO L87 Difference]: Start difference. First operand 143 states and 154 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2025-03-17 11:55:28,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:28,892 INFO L93 Difference]: Finished difference Result 142 states and 153 transitions. [2025-03-17 11:55:28,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2025-03-17 11:55:28,893 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2025-03-17 11:55:28,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:28,893 INFO L225 Difference]: With dead ends: 142 [2025-03-17 11:55:28,893 INFO L226 Difference]: Without dead ends: 142 [2025-03-17 11:55:28,894 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2025-03-17 11:55:28,894 INFO L435 NwaCegarLoop]: 72 mSDtfsCounter, 238 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:28,894 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 311 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2025-03-17 11:55:28,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2025-03-17 11:55:28,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2025-03-17 11:55:28,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 88 states have (on average 1.5568181818181819) internal successors, (137), 128 states have internal predecessors, (137), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:28,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 153 transitions. [2025-03-17 11:55:28,900 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 153 transitions. Word has length 21 [2025-03-17 11:55:28,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:28,900 INFO L471 AbstractCegarLoop]: Abstraction has 142 states and 153 transitions. [2025-03-17 11:55:28,901 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2025-03-17 11:55:28,902 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 153 transitions. [2025-03-17 11:55:28,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2025-03-17 11:55:28,902 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:28,902 INFO L218 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:28,909 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2025-03-17 11:55:29,102 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 [2025-03-17 11:55:29,103 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting list_addErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:29,103 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:29,104 INFO L85 PathProgramCache]: Analyzing trace with hash -1094550765, now seen corresponding path program 1 times [2025-03-17 11:55:29,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:29,104 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1003679191] [2025-03-17 11:55:29,104 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:29,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:29,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:29,106 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 11:55:29,107 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 11:55:29,172 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes. [2025-03-17 11:55:29,204 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 11:55:29,204 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:29,204 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:29,208 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 30 conjuncts are in the unsatisfiable core [2025-03-17 11:55:29,213 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:29,363 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:29,493 INFO L349 Elim1Store]: treesize reduction 122, result has 25.6 percent of original size [2025-03-17 11:55:29,493 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 39 treesize of output 60 [2025-03-17 11:55:29,581 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 21 [2025-03-17 11:55:29,651 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2025-03-17 11:55:29,712 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 11:55:29,712 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 11:55:29,860 WARN L851 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_343 (Array (_ BitVec 32) (_ BitVec 32))) (|v_ULTIMATE.start_gl_insert_~node~0#1.base_11| (_ BitVec 32)) (v_ArrVal_342 (_ BitVec 1))) (or (= (_ bv0 1) (bvadd (_ bv1 1) (select (store |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_11| v_ArrVal_342) (select (select (store |c_#memory_$Pointer$#0.base| |v_ULTIMATE.start_gl_insert_~node~0#1.base_11| v_ArrVal_343) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))) (not (= (_ bv0 1) (select |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_11|))))) is different from false [2025-03-17 11:55:29,951 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2025-03-17 11:55:29,951 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 26 [2025-03-17 11:55:29,954 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 11:55:29,956 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 15 [2025-03-17 11:55:29,985 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:29,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003679191] [2025-03-17 11:55:29,985 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003679191] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 11:55:29,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1167380941] [2025-03-17 11:55:29,985 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:29,985 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2025-03-17 11:55:29,985 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2025-03-17 11:55:29,987 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2025-03-17 11:55:29,988 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2025-03-17 11:55:30,077 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes. [2025-03-17 11:55:30,215 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 11:55:30,215 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:30,215 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:30,228 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 34 conjuncts are in the unsatisfiable core [2025-03-17 11:55:30,230 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:30,274 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2025-03-17 11:55:30,275 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 14 treesize of output 20 [2025-03-17 11:55:30,565 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:30,726 INFO L349 Elim1Store]: treesize reduction 112, result has 27.3 percent of original size [2025-03-17 11:55:30,726 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 39 treesize of output 60 [2025-03-17 11:55:30,809 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 21 [2025-03-17 11:55:30,919 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2025-03-17 11:55:30,986 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 11:55:30,986 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 11:55:31,164 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2025-03-17 11:55:31,164 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 26 [2025-03-17 11:55:31,169 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 11:55:31,171 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 15 [2025-03-17 11:55:31,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1167380941] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 11:55:31,202 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2025-03-17 11:55:31,202 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 25 [2025-03-17 11:55:31,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31033285] [2025-03-17 11:55:31,202 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2025-03-17 11:55:31,202 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2025-03-17 11:55:31,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:31,203 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2025-03-17 11:55:31,203 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1029, Unknown=17, NotChecked=66, Total=1260 [2025-03-17 11:55:31,203 INFO L87 Difference]: Start difference. First operand 142 states and 153 transitions. Second operand has 26 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2025-03-17 11:55:32,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:32,965 INFO L93 Difference]: Finished difference Result 224 states and 239 transitions. [2025-03-17 11:55:32,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2025-03-17 11:55:32,965 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2025-03-17 11:55:32,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:32,966 INFO L225 Difference]: With dead ends: 224 [2025-03-17 11:55:32,966 INFO L226 Difference]: Without dead ends: 224 [2025-03-17 11:55:32,967 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 1 IntricatePredicates, 2 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=290, Invalid=1677, Unknown=17, NotChecked=86, Total=2070 [2025-03-17 11:55:32,967 INFO L435 NwaCegarLoop]: 67 mSDtfsCounter, 212 mSDsluCounter, 949 mSDsCounter, 0 mSdLazyCounter, 1287 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1016 SdHoareTripleChecker+Invalid, 1299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:32,967 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 1016 Invalid, 1299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1287 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2025-03-17 11:55:32,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2025-03-17 11:55:32,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 149. [2025-03-17 11:55:32,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 93 states have (on average 1.5161290322580645) internal successors, (141), 134 states have internal predecessors, (141), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2025-03-17 11:55:32,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 159 transitions. [2025-03-17 11:55:32,973 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 159 transitions. Word has length 25 [2025-03-17 11:55:32,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:32,973 INFO L471 AbstractCegarLoop]: Abstraction has 149 states and 159 transitions. [2025-03-17 11:55:32,973 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2025-03-17 11:55:32,974 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 159 transitions. [2025-03-17 11:55:32,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2025-03-17 11:55:32,975 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:32,975 INFO L218 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:32,980 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2025-03-17 11:55:33,185 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 11:55:33,379 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:33,379 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting list_addErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:33,380 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:33,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1094550764, now seen corresponding path program 1 times [2025-03-17 11:55:33,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:33,380 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [893637669] [2025-03-17 11:55:33,380 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:33,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:33,380 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:33,382 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 11:55:33,383 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 11:55:33,443 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes. [2025-03-17 11:55:33,478 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 11:55:33,478 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:33,478 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:33,481 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 47 conjuncts are in the unsatisfiable core [2025-03-17 11:55:33,484 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:33,489 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 11:55:33,754 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:33,759 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:33,960 INFO L349 Elim1Store]: treesize reduction 56, result has 23.3 percent of original size [2025-03-17 11:55:33,960 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 31 treesize of output 35 [2025-03-17 11:55:33,972 INFO L349 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2025-03-17 11:55:33,972 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 21 [2025-03-17 11:55:34,044 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 19 [2025-03-17 11:55:34,050 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 11:55:34,133 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 17 treesize of output 9 [2025-03-17 11:55:34,190 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 11:55:34,190 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 11:55:34,463 WARN L851 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_474 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$#0.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_474) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd (_ bv8 32) .cse0)))) (forall ((v_ArrVal_475 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_474 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (_ bv8 32) (select (select (store |c_#memory_$Pointer$#0.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_474) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (select |c_#length| (select (select (store |c_#memory_$Pointer$#0.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_475) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))))) is different from false [2025-03-17 11:55:34,909 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2025-03-17 11:55:34,909 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 42 treesize of output 43 [2025-03-17 11:55:34,912 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 11:55:34,915 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 40 treesize of output 32 [2025-03-17 11:55:34,924 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2025-03-17 11:55:34,924 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 27 treesize of output 28 [2025-03-17 11:55:34,926 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 11:55:34,928 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 25 treesize of output 17 [2025-03-17 11:55:34,945 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2025-03-17 11:55:34,945 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 41 treesize of output 32 [2025-03-17 11:55:34,948 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 11:55:34,949 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 26 treesize of output 14 [2025-03-17 11:55:35,089 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:35,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893637669] [2025-03-17 11:55:35,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893637669] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 11:55:35,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [829638770] [2025-03-17 11:55:35,089 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:35,089 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2025-03-17 11:55:35,089 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2025-03-17 11:55:35,091 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2025-03-17 11:55:35,091 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2025-03-17 11:55:35,176 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes. [2025-03-17 11:55:35,371 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements. [2025-03-17 11:55:35,371 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:35,371 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:35,375 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 48 conjuncts are in the unsatisfiable core [2025-03-17 11:55:35,379 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:35,424 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 11:55:35,427 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 7 [2025-03-17 11:55:35,928 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:35,937 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:36,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 11:55:36,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 11:55:36,202 INFO L349 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2025-03-17 11:55:36,202 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 21 [2025-03-17 11:55:36,222 INFO L349 Elim1Store]: treesize reduction 56, result has 23.3 percent of original size [2025-03-17 11:55:36,222 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 31 treesize of output 35 [2025-03-17 11:55:36,324 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 19 [2025-03-17 11:55:36,330 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 11:55:36,523 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 17 treesize of output 9 [2025-03-17 11:55:36,554 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 11:55:36,554 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 11:55:36,600 WARN L851 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_543 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_544 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (select (select (store |c_#memory_$Pointer$#0.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_544) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|) (_ bv8 32)) (select |c_#length| (select (select (store |c_#memory_$Pointer$#0.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_543) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))) (forall ((v_ArrVal_544 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$#0.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_544) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))) (bvule (bvadd .cse0 (_ bv4 32)) (bvadd .cse0 (_ bv8 32)))))) is different from false [2025-03-17 11:55:36,652 WARN L851 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_gl_insert_~node~0#1.base_23| (_ BitVec 32))) (or (forall ((v_ArrVal_544 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$#0.offset| |v_ULTIMATE.start_gl_insert_~node~0#1.base_23| v_ArrVal_544) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd (_ bv8 32) .cse0)))) (not (= (_ bv0 1) (select |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_23|))))) (forall ((|v_ULTIMATE.start_gl_insert_~node~0#1.base_23| (_ BitVec 32))) (or (forall ((v_ArrVal_543 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_544 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_542 (_ BitVec 32))) (bvule (bvadd (_ bv8 32) (select (select (store |c_#memory_$Pointer$#0.offset| |v_ULTIMATE.start_gl_insert_~node~0#1.base_23| v_ArrVal_544) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (select (store |c_#length| |v_ULTIMATE.start_gl_insert_~node~0#1.base_23| v_ArrVal_542) (select (select (store |c_#memory_$Pointer$#0.base| |v_ULTIMATE.start_gl_insert_~node~0#1.base_23| v_ArrVal_543) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)))) (not (= (_ bv0 1) (select |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_23|)))))) is different from false [2025-03-17 11:55:36,838 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2025-03-17 11:55:36,838 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 41 treesize of output 32 [2025-03-17 11:55:36,840 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 11:55:36,841 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 26 treesize of output 14 [2025-03-17 11:55:36,851 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2025-03-17 11:55:36,851 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 42 treesize of output 43 [2025-03-17 11:55:36,852 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 11:55:36,854 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 40 treesize of output 32 [2025-03-17 11:55:36,859 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2025-03-17 11:55:36,859 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 27 treesize of output 28 [2025-03-17 11:55:36,862 INFO L173 IndexEqualityManager]: detected equality via solver [2025-03-17 11:55:36,863 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 25 treesize of output 17 [2025-03-17 11:55:36,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [829638770] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 11:55:36,965 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2025-03-17 11:55:36,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 28 [2025-03-17 11:55:36,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791690444] [2025-03-17 11:55:36,966 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2025-03-17 11:55:36,966 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2025-03-17 11:55:36,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:36,966 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2025-03-17 11:55:36,967 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1195, Unknown=4, NotChecked=216, Total=1560 [2025-03-17 11:55:36,967 INFO L87 Difference]: Start difference. First operand 149 states and 159 transitions. Second operand has 29 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2025-03-17 11:55:39,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:39,856 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2025-03-17 11:55:39,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2025-03-17 11:55:39,856 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2025-03-17 11:55:39,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:39,857 INFO L225 Difference]: With dead ends: 211 [2025-03-17 11:55:39,857 INFO L226 Difference]: Without dead ends: 211 [2025-03-17 11:55:39,857 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=290, Invalid=1788, Unknown=4, NotChecked=270, Total=2352 [2025-03-17 11:55:39,858 INFO L435 NwaCegarLoop]: 54 mSDtfsCounter, 531 mSDsluCounter, 700 mSDsCounter, 0 mSdLazyCounter, 1669 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 533 SdHoareTripleChecker+Valid, 754 SdHoareTripleChecker+Invalid, 1743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 1669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:39,858 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [533 Valid, 754 Invalid, 1743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 1669 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2025-03-17 11:55:39,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2025-03-17 11:55:39,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 141. [2025-03-17 11:55:39,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 86 states have (on average 1.5465116279069768) internal successors, (133), 127 states have internal predecessors, (133), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:39,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 149 transitions. [2025-03-17 11:55:39,864 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 149 transitions. Word has length 25 [2025-03-17 11:55:39,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:39,864 INFO L471 AbstractCegarLoop]: Abstraction has 141 states and 149 transitions. [2025-03-17 11:55:39,864 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2025-03-17 11:55:39,864 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 149 transitions. [2025-03-17 11:55:39,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2025-03-17 11:55:39,865 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:39,865 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:39,871 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2025-03-17 11:55:40,069 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2025-03-17 11:55:40,265 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,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2025-03-17 11:55:40,265 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:40,266 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:40,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1448940699, now seen corresponding path program 1 times [2025-03-17 11:55:40,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:40,266 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [43870730] [2025-03-17 11:55:40,266 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:40,266 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:40,266 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:40,268 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 11:55:40,269 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 11:55:40,331 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 30 statements into 1 equivalence classes. [2025-03-17 11:55:40,349 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 30 of 30 statements. [2025-03-17 11:55:40,349 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:40,349 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:40,354 INFO L256 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 20 conjuncts are in the unsatisfiable core [2025-03-17 11:55:40,356 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:40,360 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 7 [2025-03-17 11:55:40,426 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:40,493 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2025-03-17 11:55:40,520 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 11:55:40,520 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:40,520 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:40,520 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43870730] [2025-03-17 11:55:40,520 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43870730] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:40,520 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:40,520 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2025-03-17 11:55:40,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455923533] [2025-03-17 11:55:40,520 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:40,520 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2025-03-17 11:55:40,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:40,521 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2025-03-17 11:55:40,521 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2025-03-17 11:55:40,521 INFO L87 Difference]: Start difference. First operand 141 states and 149 transitions. Second operand has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2025-03-17 11:55:41,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:41,265 INFO L93 Difference]: Finished difference Result 206 states and 220 transitions. [2025-03-17 11:55:41,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2025-03-17 11:55:41,266 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2025-03-17 11:55:41,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:41,267 INFO L225 Difference]: With dead ends: 206 [2025-03-17 11:55:41,267 INFO L226 Difference]: Without dead ends: 206 [2025-03-17 11:55:41,267 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2025-03-17 11:55:41,267 INFO L435 NwaCegarLoop]: 65 mSDtfsCounter, 249 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 587 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:41,267 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 425 Invalid, 587 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2025-03-17 11:55:41,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2025-03-17 11:55:41,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 143. [2025-03-17 11:55:41,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 89 states have (on average 1.5393258426966292) internal successors, (137), 129 states have internal predecessors, (137), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:41,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 153 transitions. [2025-03-17 11:55:41,271 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 153 transitions. Word has length 30 [2025-03-17 11:55:41,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:41,271 INFO L471 AbstractCegarLoop]: Abstraction has 143 states and 153 transitions. [2025-03-17 11:55:41,271 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2025-03-17 11:55:41,271 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 153 transitions. [2025-03-17 11:55:41,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2025-03-17 11:55:41,272 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:41,272 INFO L218 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:41,279 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2025-03-17 11:55:41,476 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 [2025-03-17 11:55:41,476 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:41,476 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:41,476 INFO L85 PathProgramCache]: Analyzing trace with hash 1448940700, now seen corresponding path program 1 times [2025-03-17 11:55:41,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:41,476 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [273283424] [2025-03-17 11:55:41,476 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:41,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:41,477 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:41,478 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 11:55:41,480 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 11:55:41,544 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 30 statements into 1 equivalence classes. [2025-03-17 11:55:41,562 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 30 of 30 statements. [2025-03-17 11:55:41,562 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:41,562 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:41,563 INFO L256 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 24 conjuncts are in the unsatisfiable core [2025-03-17 11:55:41,565 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:41,631 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:41,763 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 11:55:41,763 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:41,763 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:41,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273283424] [2025-03-17 11:55:41,763 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273283424] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:41,763 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:41,763 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2025-03-17 11:55:41,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951156844] [2025-03-17 11:55:41,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:41,764 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2025-03-17 11:55:41,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:41,764 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2025-03-17 11:55:41,764 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2025-03-17 11:55:41,764 INFO L87 Difference]: Start difference. First operand 143 states and 153 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2025-03-17 11:55:42,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:42,251 INFO L93 Difference]: Finished difference Result 184 states and 197 transitions. [2025-03-17 11:55:42,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2025-03-17 11:55:42,251 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2025-03-17 11:55:42,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:42,252 INFO L225 Difference]: With dead ends: 184 [2025-03-17 11:55:42,252 INFO L226 Difference]: Without dead ends: 184 [2025-03-17 11:55:42,252 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2025-03-17 11:55:42,252 INFO L435 NwaCegarLoop]: 94 mSDtfsCounter, 208 mSDsluCounter, 713 mSDsCounter, 0 mSdLazyCounter, 483 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 807 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:42,252 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 807 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 483 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2025-03-17 11:55:42,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2025-03-17 11:55:42,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 138. [2025-03-17 11:55:42,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 84 states have (on average 1.5357142857142858) internal successors, (129), 124 states have internal predecessors, (129), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:42,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 145 transitions. [2025-03-17 11:55:42,255 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 145 transitions. Word has length 30 [2025-03-17 11:55:42,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:42,256 INFO L471 AbstractCegarLoop]: Abstraction has 138 states and 145 transitions. [2025-03-17 11:55:42,256 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 10 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2025-03-17 11:55:42,256 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 145 transitions. [2025-03-17 11:55:42,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2025-03-17 11:55:42,257 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:42,257 INFO L218 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:42,265 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2025-03-17 11:55:42,457 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 [2025-03-17 11:55:42,458 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:42,458 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:42,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1542214720, now seen corresponding path program 1 times [2025-03-17 11:55:42,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:42,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1867452512] [2025-03-17 11:55:42,458 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:42,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:42,458 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:42,460 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 11:55:42,462 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 11:55:42,536 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 36 statements into 1 equivalence classes. [2025-03-17 11:55:42,554 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 36 of 36 statements. [2025-03-17 11:55:42,554 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:42,554 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:42,556 INFO L256 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 3 conjuncts are in the unsatisfiable core [2025-03-17 11:55:42,557 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:42,562 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 7 [2025-03-17 11:55:42,587 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 11:55:42,588 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:42,588 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:42,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867452512] [2025-03-17 11:55:42,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867452512] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:42,588 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:42,588 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2025-03-17 11:55:42,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186530000] [2025-03-17 11:55:42,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:42,588 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2025-03-17 11:55:42,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:42,588 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2025-03-17 11:55:42,588 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2025-03-17 11:55:42,588 INFO L87 Difference]: Start difference. First operand 138 states and 145 transitions. Second operand has 4 states, 3 states have (on average 10.0) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2025-03-17 11:55:42,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:42,709 INFO L93 Difference]: Finished difference Result 134 states and 141 transitions. [2025-03-17 11:55:42,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2025-03-17 11:55:42,709 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 10.0) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 36 [2025-03-17 11:55:42,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:42,710 INFO L225 Difference]: With dead ends: 134 [2025-03-17 11:55:42,710 INFO L226 Difference]: Without dead ends: 134 [2025-03-17 11:55:42,710 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2025-03-17 11:55:42,714 INFO L435 NwaCegarLoop]: 72 mSDtfsCounter, 99 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:42,714 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 107 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2025-03-17 11:55:42,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2025-03-17 11:55:42,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2025-03-17 11:55:42,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 84 states have (on average 1.4880952380952381) internal successors, (125), 120 states have internal predecessors, (125), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:42,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 141 transitions. [2025-03-17 11:55:42,716 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 141 transitions. Word has length 36 [2025-03-17 11:55:42,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:42,716 INFO L471 AbstractCegarLoop]: Abstraction has 134 states and 141 transitions. [2025-03-17 11:55:42,716 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 10.0) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2025-03-17 11:55:42,717 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 141 transitions. [2025-03-17 11:55:42,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2025-03-17 11:55:42,717 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:42,717 INFO L218 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:42,724 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2025-03-17 11:55:42,917 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:42,917 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr25REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:42,918 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:42,918 INFO L85 PathProgramCache]: Analyzing trace with hash -1542214719, now seen corresponding path program 1 times [2025-03-17 11:55:42,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:42,918 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1203840591] [2025-03-17 11:55:42,918 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:42,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:42,918 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:42,920 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 11:55:42,920 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2025-03-17 11:55:42,992 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 36 statements into 1 equivalence classes. [2025-03-17 11:55:43,012 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 36 of 36 statements. [2025-03-17 11:55:43,013 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:43,013 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:43,015 INFO L256 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 24 conjuncts are in the unsatisfiable core [2025-03-17 11:55:43,017 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:43,085 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:43,251 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2025-03-17 11:55:43,251 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:43,251 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:43,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203840591] [2025-03-17 11:55:43,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203840591] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:43,251 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:43,251 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2025-03-17 11:55:43,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407724528] [2025-03-17 11:55:43,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:43,252 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2025-03-17 11:55:43,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:43,252 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2025-03-17 11:55:43,252 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2025-03-17 11:55:43,252 INFO L87 Difference]: Start difference. First operand 134 states and 141 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2025-03-17 11:55:43,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:43,684 INFO L93 Difference]: Finished difference Result 179 states and 191 transitions. [2025-03-17 11:55:43,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2025-03-17 11:55:43,685 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 36 [2025-03-17 11:55:43,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:43,686 INFO L225 Difference]: With dead ends: 179 [2025-03-17 11:55:43,686 INFO L226 Difference]: Without dead ends: 179 [2025-03-17 11:55:43,686 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2025-03-17 11:55:43,686 INFO L435 NwaCegarLoop]: 89 mSDtfsCounter, 195 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:43,686 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 691 Invalid, 429 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2025-03-17 11:55:43,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2025-03-17 11:55:43,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 135. [2025-03-17 11:55:43,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 85 states have (on average 1.4823529411764707) internal successors, (126), 120 states have internal predecessors, (126), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2025-03-17 11:55:43,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 142 transitions. [2025-03-17 11:55:43,689 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 142 transitions. Word has length 36 [2025-03-17 11:55:43,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:43,689 INFO L471 AbstractCegarLoop]: Abstraction has 135 states and 142 transitions. [2025-03-17 11:55:43,689 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 10 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2025-03-17 11:55:43,689 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 142 transitions. [2025-03-17 11:55:43,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2025-03-17 11:55:43,690 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:43,690 INFO L218 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:43,697 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2025-03-17 11:55:43,890 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:43,890 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:43,891 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:43,891 INFO L85 PathProgramCache]: Analyzing trace with hash -81245153, now seen corresponding path program 1 times [2025-03-17 11:55:43,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:43,891 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1299487815] [2025-03-17 11:55:43,891 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:43,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:43,891 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:43,894 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 11:55:43,894 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2025-03-17 11:55:43,966 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 38 statements into 1 equivalence classes. [2025-03-17 11:55:43,990 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 38 of 38 statements. [2025-03-17 11:55:43,990 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:43,990 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:43,993 INFO L256 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 24 conjuncts are in the unsatisfiable core [2025-03-17 11:55:43,995 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:44,079 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:44,161 INFO L349 Elim1Store]: treesize reduction 74, result has 29.5 percent of original size [2025-03-17 11:55:44,161 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 32 treesize of output 44 [2025-03-17 11:55:44,204 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2025-03-17 11:55:44,263 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2025-03-17 11:55:44,263 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2025-03-17 11:55:44,263 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:44,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299487815] [2025-03-17 11:55:44,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299487815] provided 1 perfect and 0 imperfect interpolant sequences [2025-03-17 11:55:44,263 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2025-03-17 11:55:44,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2025-03-17 11:55:44,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427025118] [2025-03-17 11:55:44,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2025-03-17 11:55:44,264 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2025-03-17 11:55:44,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:44,264 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2025-03-17 11:55:44,264 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2025-03-17 11:55:44,264 INFO L87 Difference]: Start difference. First operand 135 states and 142 transitions. Second operand has 12 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2025-03-17 11:55:45,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:45,162 INFO L93 Difference]: Finished difference Result 209 states and 226 transitions. [2025-03-17 11:55:45,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2025-03-17 11:55:45,163 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 38 [2025-03-17 11:55:45,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:45,163 INFO L225 Difference]: With dead ends: 209 [2025-03-17 11:55:45,163 INFO L226 Difference]: Without dead ends: 209 [2025-03-17 11:55:45,164 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2025-03-17 11:55:45,165 INFO L435 NwaCegarLoop]: 63 mSDtfsCounter, 193 mSDsluCounter, 462 mSDsCounter, 0 mSdLazyCounter, 693 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:45,165 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 525 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 693 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2025-03-17 11:55:45,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2025-03-17 11:55:45,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 157. [2025-03-17 11:55:45,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 103 states have (on average 1.4757281553398058) internal successors, (152), 138 states have internal predecessors, (152), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2025-03-17 11:55:45,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 172 transitions. [2025-03-17 11:55:45,171 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 172 transitions. Word has length 38 [2025-03-17 11:55:45,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:45,171 INFO L471 AbstractCegarLoop]: Abstraction has 157 states and 172 transitions. [2025-03-17 11:55:45,171 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2025-03-17 11:55:45,171 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 172 transitions. [2025-03-17 11:55:45,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2025-03-17 11:55:45,172 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:45,172 INFO L218 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:45,179 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2025-03-17 11:55:45,372 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:45,373 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:45,373 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:45,373 INFO L85 PathProgramCache]: Analyzing trace with hash -81245152, now seen corresponding path program 1 times [2025-03-17 11:55:45,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:45,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1876414059] [2025-03-17 11:55:45,374 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:45,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:45,374 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:45,375 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 11:55:45,376 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2025-03-17 11:55:45,455 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 38 statements into 1 equivalence classes. [2025-03-17 11:55:45,482 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 38 of 38 statements. [2025-03-17 11:55:45,482 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:45,482 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:45,491 INFO L256 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 40 conjuncts are in the unsatisfiable core [2025-03-17 11:55:45,495 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:45,498 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 11:55:45,691 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:45,697 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:45,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 11:55:45,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 11:55:45,938 INFO L349 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2025-03-17 11:55:45,939 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 21 [2025-03-17 11:55:45,958 INFO L349 Elim1Store]: treesize reduction 26, result has 33.3 percent of original size [2025-03-17 11:55:45,959 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 26 [2025-03-17 11:55:46,029 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 17 treesize of output 9 [2025-03-17 11:55:46,131 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 11:55:46,131 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 11:55:50,467 INFO L136 FreeRefinementEngine]: Strategy FOX found an infeasible trace [2025-03-17 11:55:50,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876414059] [2025-03-17 11:55:50,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876414059] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 11:55:50,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1992301958] [2025-03-17 11:55:50,468 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:50,468 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2025-03-17 11:55:50,468 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2025-03-17 11:55:50,469 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2025-03-17 11:55:50,470 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2025-03-17 11:55:50,576 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 38 statements into 1 equivalence classes. [2025-03-17 11:55:50,744 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 38 of 38 statements. [2025-03-17 11:55:50,744 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:50,744 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:50,759 INFO L256 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 41 conjuncts are in the unsatisfiable core [2025-03-17 11:55:50,761 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:50,792 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 11:55:51,115 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:51,120 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2025-03-17 11:55:51,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 11:55:51,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2025-03-17 11:55:51,436 INFO L349 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2025-03-17 11:55:51,437 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 21 [2025-03-17 11:55:51,761 INFO L349 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2025-03-17 11:55:51,761 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 31 treesize of output 24 [2025-03-17 11:55:52,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2025-03-17 11:55:52,037 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 11:55:52,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1992301958] provided 0 perfect and 1 imperfect interpolant sequences [2025-03-17 11:55:52,250 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2025-03-17 11:55:52,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 26 [2025-03-17 11:55:52,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117569723] [2025-03-17 11:55:52,250 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2025-03-17 11:55:52,250 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2025-03-17 11:55:52,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FOX [2025-03-17 11:55:52,251 INFO L144 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2025-03-17 11:55:52,251 INFO L146 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1014, Unknown=1, NotChecked=0, Total=1122 [2025-03-17 11:55:52,251 INFO L87 Difference]: Start difference. First operand 157 states and 172 transitions. Second operand has 27 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2025-03-17 11:55:58,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2025-03-17 11:55:58,646 INFO L93 Difference]: Finished difference Result 195 states and 208 transitions. [2025-03-17 11:55:58,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2025-03-17 11:55:58,646 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) Word has length 38 [2025-03-17 11:55:58,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2025-03-17 11:55:58,647 INFO L225 Difference]: With dead ends: 195 [2025-03-17 11:55:58,647 INFO L226 Difference]: Without dead ends: 195 [2025-03-17 11:55:58,647 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 521 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=291, Invalid=1964, Unknown=1, NotChecked=0, Total=2256 [2025-03-17 11:55:58,648 INFO L435 NwaCegarLoop]: 50 mSDtfsCounter, 451 mSDsluCounter, 634 mSDsCounter, 0 mSdLazyCounter, 1500 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 451 SdHoareTripleChecker+Valid, 684 SdHoareTripleChecker+Invalid, 1577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 1500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2025-03-17 11:55:58,648 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [451 Valid, 684 Invalid, 1577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 1500 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2025-03-17 11:55:58,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2025-03-17 11:55:58,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 162. [2025-03-17 11:55:58,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 107 states have (on average 1.439252336448598) internal successors, (154), 142 states have internal predecessors, (154), 10 states have call successors, (10), 9 states have call predecessors, (10), 9 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2025-03-17 11:55:58,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 174 transitions. [2025-03-17 11:55:58,651 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 174 transitions. Word has length 38 [2025-03-17 11:55:58,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2025-03-17 11:55:58,651 INFO L471 AbstractCegarLoop]: Abstraction has 162 states and 174 transitions. [2025-03-17 11:55:58,651 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2025-03-17 11:55:58,651 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 174 transitions. [2025-03-17 11:55:58,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2025-03-17 11:55:58,651 INFO L210 NwaCegarLoop]: Found error trace [2025-03-17 11:55:58,651 INFO L218 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2025-03-17 11:55:58,658 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2025-03-17 11:55:58,859 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2025-03-17 11:55:59,052 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:59,052 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [val_from_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, val_from_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, list_emptyErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 53 more)] === [2025-03-17 11:55:59,052 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2025-03-17 11:55:59,052 INFO L85 PathProgramCache]: Analyzing trace with hash -1871466716, now seen corresponding path program 1 times [2025-03-17 11:55:59,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy FOX [2025-03-17 11:55:59,053 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1446302562] [2025-03-17 11:55:59,053 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2025-03-17 11:55:59,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2025-03-17 11:55:59,053 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2025-03-17 11:55:59,054 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2025-03-17 11:55:59,055 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2025-03-17 11:55:59,136 INFO L108 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 48 statements into 1 equivalence classes. [2025-03-17 11:55:59,165 INFO L111 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 48 of 48 statements. [2025-03-17 11:55:59,165 INFO L114 AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) [2025-03-17 11:55:59,165 INFO L115 AnnotateAndAsserter]: Conjunction of SSA is unsat [2025-03-17 11:55:59,168 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 47 conjuncts are in the unsatisfiable core [2025-03-17 11:55:59,172 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2025-03-17 11:55:59,188 INFO L349 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2025-03-17 11:55:59,188 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 13 treesize of output 13 [2025-03-17 11:55:59,204 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11:55:59,210 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 7 treesize of output 3 [2025-03-17 11:55:59,303 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2025-03-17 11:55:59,333 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 31 treesize of output 15 [2025-03-17 11:55:59,368 INFO L349 Elim1Store]: treesize reduction 25, result has 47.9 percent of original size [2025-03-17 11:55:59,368 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 27 treesize of output 38 [2025-03-17 11:55:59,381 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 1 [2025-03-17 11:55:59,451 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 7 treesize of output 3 [2025-03-17 11:55:59,582 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 15 [2025-03-17 11:55:59,880 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2025-03-17 11:55:59,880 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2025-03-17 11:56:00,050 INFO L349 Elim1Store]: treesize reduction 7, result has 68.2 percent of original size [2025-03-17 11:56:00,050 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 28 treesize of output 27 [2025-03-17 11:56:00,725 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 76 treesize of output 72 [2025-03-17 11:56:01,937 INFO L349 Elim1Store]: treesize reduction 99, result has 63.7 percent of original size [2025-03-17 11:56:01,937 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 9 new quantified variables, introduced 28 case distinctions, treesize of input 3173 treesize of output 3206