./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/weaver/chl-word-symm.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/chl-word-symm.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bf81f7b3bd1ceac2bf46c7c37f69effc0af9de17b18c7565156301fb49a6164e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:46:41,631 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:46:41,701 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-19 04:46:41,707 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:46:41,707 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:46:41,735 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:46:41,735 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:46:41,736 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:46:41,737 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:46:41,738 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:46:41,739 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:46:41,739 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:46:41,740 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:46:41,741 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:46:41,741 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:46:41,742 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:46:41,743 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:46:41,743 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:46:41,744 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:46:41,745 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:46:41,745 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:46:41,746 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:46:41,747 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 04:46:41,748 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 04:46:41,749 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:46:41,749 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:46:41,750 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:46:41,750 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:46:41,751 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:46:41,752 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 04:46:41,752 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 04:46:41,753 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 04:46:41,753 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:46:41,754 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 04:46:41,755 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 04:46:41,755 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:46:41,755 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:46:41,756 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:46:41,756 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:46:41,756 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:46:41,757 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:46:41,758 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:46:41,758 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:46:41,759 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:46:41,759 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:46:41,759 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:46:41,760 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bf81f7b3bd1ceac2bf46c7c37f69effc0af9de17b18c7565156301fb49a6164e [2023-11-19 04:46:42,087 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:46:42,120 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:46:42,123 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:46:42,125 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:46:42,126 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:46:42,128 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/weaver/chl-word-symm.wvr.c [2023-11-19 04:46:45,258 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:46:45,492 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:46:45,493 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/sv-benchmarks/c/weaver/chl-word-symm.wvr.c [2023-11-19 04:46:45,503 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/data/992f425e7/cbe9a0154f8a49bdbc8e56d687b7dd5d/FLAG360fde9cb [2023-11-19 04:46:45,519 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/data/992f425e7/cbe9a0154f8a49bdbc8e56d687b7dd5d [2023-11-19 04:46:45,521 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:46:45,523 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:46:45,524 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:46:45,525 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:46:45,530 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:46:45,531 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:46:45" (1/1) ... [2023-11-19 04:46:45,533 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b2e3fb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:45, skipping insertion in model container [2023-11-19 04:46:45,533 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:46:45" (1/1) ... [2023-11-19 04:46:45,560 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:46:45,785 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:46:45,798 ERROR L324 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) [2023-11-19 04:46:45,799 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@467efeff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:45, skipping insertion in model container [2023-11-19 04:46:45,800 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:46:45,800 INFO L186 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2023-11-19 04:46:45,802 INFO L158 Benchmark]: Toolchain (without parser) took 278.37ms. Allocated memory is still 153.1MB. Free memory was 106.7MB in the beginning and 96.7MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-11-19 04:46:45,803 INFO L158 Benchmark]: CDTParser took 0.35ms. Allocated memory is still 153.1MB. Free memory is still 125.0MB. There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 04:46:45,804 INFO L158 Benchmark]: CACSL2BoogieTranslator took 275.62ms. Allocated memory is still 153.1MB. Free memory was 106.7MB in the beginning and 96.7MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-11-19 04:46:45,806 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35ms. Allocated memory is still 153.1MB. Free memory is still 125.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 275.62ms. Allocated memory is still 153.1MB. Free memory was 106.7MB in the beginning and 96.7MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 114]: 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: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/chl-word-symm.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bf81f7b3bd1ceac2bf46c7c37f69effc0af9de17b18c7565156301fb49a6164e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:46:48,265 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:46:48,401 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2023-11-19 04:46:48,409 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:46:48,410 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:46:48,448 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:46:48,449 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:46:48,450 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:46:48,451 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:46:48,451 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:46:48,452 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:46:48,452 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:46:48,453 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:46:48,453 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:46:48,454 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:46:48,454 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:46:48,455 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 04:46:48,456 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 04:46:48,456 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:46:48,457 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:46:48,462 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:46:48,462 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:46:48,463 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:46:48,463 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 04:46:48,464 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 04:46:48,464 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 04:46:48,465 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:46:48,465 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 04:46:48,465 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2023-11-19 04:46:48,466 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2023-11-19 04:46:48,467 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 04:46:48,468 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:46:48,468 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:46:48,468 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:46:48,469 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-19 04:46:48,469 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:46:48,470 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:46:48,470 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:46:48,471 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:46:48,471 INFO L153 SettingsManager]: * Trace refinement strategy=WALRUS [2023-11-19 04:46:48,471 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2023-11-19 04:46:48,472 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:46:48,472 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:46:48,472 INFO L153 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bf81f7b3bd1ceac2bf46c7c37f69effc0af9de17b18c7565156301fb49a6164e [2023-11-19 04:46:48,864 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:46:48,887 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:46:48,890 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:46:48,891 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:46:48,892 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:46:48,893 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/weaver/chl-word-symm.wvr.c [2023-11-19 04:46:52,014 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:46:52,310 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:46:52,311 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/sv-benchmarks/c/weaver/chl-word-symm.wvr.c [2023-11-19 04:46:52,324 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/data/2b306d2ed/cc1dcf2ef9764036a467ac53bd710d55/FLAG2f56bc6dc [2023-11-19 04:46:52,346 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/data/2b306d2ed/cc1dcf2ef9764036a467ac53bd710d55 [2023-11-19 04:46:52,354 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:46:52,356 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:46:52,360 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:46:52,360 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:46:52,365 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:46:52,366 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:52,368 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3df57c1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52, skipping insertion in model container [2023-11-19 04:46:52,368 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:52,405 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:46:52,696 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:46:52,718 INFO L199 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2023-11-19 04:46:52,730 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:46:52,773 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:46:52,782 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:46:52,844 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:46:52,865 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:46:52,867 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52 WrapperNode [2023-11-19 04:46:52,867 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:46:52,869 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:46:52,869 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:46:52,869 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:46:52,878 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:52,897 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:52,943 INFO L138 Inliner]: procedures = 26, calls = 36, calls flagged for inlining = 10, calls inlined = 12, statements flattened = 131 [2023-11-19 04:46:52,946 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:46:52,947 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:46:52,947 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:46:52,948 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:46:52,958 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:52,958 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:52,973 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:52,974 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:53,010 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:53,015 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:53,022 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:53,051 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:53,055 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:46:53,056 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:46:53,056 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:46:53,056 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:46:53,057 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (1/1) ... [2023-11-19 04:46:53,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:46:53,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:46:53,107 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:46:53,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:46:53,158 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:46:53,159 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2023-11-19 04:46:53,159 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 04:46:53,159 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2023-11-19 04:46:53,160 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2023-11-19 04:46:53,160 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2023-11-19 04:46:53,160 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2023-11-19 04:46:53,160 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2023-11-19 04:46:53,160 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 04:46:53,162 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:46:53,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:46:53,164 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 04:46:53,164 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2023-11-19 04:46:53,165 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-11-19 04:46:53,286 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:46:53,289 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:46:53,868 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:46:53,880 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:46:53,880 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-19 04:46:53,886 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:46:53 BoogieIcfgContainer [2023-11-19 04:46:53,886 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:46:53,888 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:46:53,888 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:46:53,892 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:46:53,892 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:46:52" (1/3) ... [2023-11-19 04:46:53,893 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@613bc031 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:46:53, skipping insertion in model container [2023-11-19 04:46:53,893 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:46:52" (2/3) ... [2023-11-19 04:46:53,894 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@613bc031 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:46:53, skipping insertion in model container [2023-11-19 04:46:53,894 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:46:53" (3/3) ... [2023-11-19 04:46:53,895 INFO L112 eAbstractionObserver]: Analyzing ICFG chl-word-symm.wvr.c [2023-11-19 04:46:53,916 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:46:53,916 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 30 error locations. [2023-11-19 04:46:53,916 INFO L514 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-11-19 04:46:54,095 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-11-19 04:46:54,151 INFO L115 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2023-11-19 04:46:54,173 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 249 places, 263 transitions, 540 flow [2023-11-19 04:46:54,178 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 249 places, 263 transitions, 540 flow [2023-11-19 04:46:54,180 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 249 places, 263 transitions, 540 flow [2023-11-19 04:46:54,362 INFO L124 PetriNetUnfolderBase]: 21/261 cut-off events. [2023-11-19 04:46:54,362 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-11-19 04:46:54,370 INFO L83 FinitePrefix]: Finished finitePrefix Result has 270 conditions, 261 events. 21/261 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 419 event pairs, 0 based on Foata normal form. 0/210 useless extension candidates. Maximal degree in co-relation 170. Up to 3 conditions per place. [2023-11-19 04:46:54,393 INFO L119 LiptonReduction]: Number of co-enabled transitions 5040 [2023-11-19 04:47:30,461 INFO L134 LiptonReduction]: Checked pairs total: 8372 [2023-11-19 04:47:30,461 INFO L136 LiptonReduction]: Total number of compositions: 313 [2023-11-19 04:47:30,469 INFO L113 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 57 places, 57 transitions, 128 flow [2023-11-19 04:47:30,549 INFO L135 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 729 states, 443 states have (on average 4.6613995485327315) internal successors, (2065), 728 states have internal predecessors, (2065), 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) [2023-11-19 04:47:30,567 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:47:30,574 INFO L357 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, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@615b4be7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:47:30,574 INFO L358 AbstractCegarLoop]: Starting to check reachability of 48 error locations. [2023-11-19 04:47:30,579 INFO L276 IsEmpty]: Start isEmpty. Operand has 729 states, 443 states have (on average 4.6613995485327315) internal successors, (2065), 728 states have internal predecessors, (2065), 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) [2023-11-19 04:47:30,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-19 04:47:30,584 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:47:30,585 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-19 04:47:30,585 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-11-19 04:47:30,590 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:47:30,591 INFO L85 PathProgramCache]: Analyzing trace with hash 33162, now seen corresponding path program 1 times [2023-11-19 04:47:30,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-11-19 04:47:30,604 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [910933612] [2023-11-19 04:47:30,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:30,605 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:30,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat [2023-11-19 04:47:30,610 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-11-19 04:47:30,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2023-11-19 04:47:30,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:30,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 04:47:30,739 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:30,909 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-11-19 04:47:30,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:30,961 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 1 [2023-11-19 04:47:30,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:30,978 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:30,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:30,990 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:31,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:31,003 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:31,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:31,017 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:31,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:31,045 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:47:31,045 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-11-19 04:47:31,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [910933612] [2023-11-19 04:47:31,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [910933612] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:47:31,046 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:47:31,046 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-19 04:47:31,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206233437] [2023-11-19 04:47:31,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:47:31,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:47:31,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-11-19 04:47:31,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:47:31,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:47:31,079 INFO L87 Difference]: Start difference. First operand has 729 states, 443 states have (on average 4.6613995485327315) internal successors, (2065), 728 states have internal predecessors, (2065), 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) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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) [2023-11-19 04:47:31,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:47:31,490 INFO L93 Difference]: Finished difference Result 492 states and 1392 transitions. [2023-11-19 04:47:31,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:47:31,493 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 2 [2023-11-19 04:47:31,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:47:31,514 INFO L225 Difference]: With dead ends: 492 [2023-11-19 04:47:31,514 INFO L226 Difference]: Without dead ends: 492 [2023-11-19 04:47:31,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:47:31,519 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 2 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 04:47:31,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 0 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 04:47:31,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2023-11-19 04:47:31,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 490. [2023-11-19 04:47:31,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 321 states have (on average 4.336448598130841) internal successors, (1392), 489 states have internal predecessors, (1392), 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) [2023-11-19 04:47:31,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 1392 transitions. [2023-11-19 04:47:31,605 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 1392 transitions. Word has length 2 [2023-11-19 04:47:31,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:47:31,605 INFO L495 AbstractCegarLoop]: Abstraction has 490 states and 1392 transitions. [2023-11-19 04:47:31,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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) [2023-11-19 04:47:31,606 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 1392 transitions. [2023-11-19 04:47:31,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-19 04:47:31,606 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:47:31,606 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-19 04:47:31,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:47:31,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:31,810 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-11-19 04:47:31,810 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:47:31,810 INFO L85 PathProgramCache]: Analyzing trace with hash 33164, now seen corresponding path program 1 times [2023-11-19 04:47:31,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-11-19 04:47:31,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [29456311] [2023-11-19 04:47:31,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:31,811 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:31,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat [2023-11-19 04:47:31,813 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-11-19 04:47:31,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2023-11-19 04:47:31,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:31,868 INFO L262 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 04:47:31,869 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:31,882 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2023-11-19 04:47:31,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:31,893 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-19 04:47:31,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:31,901 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-19 04:47:31,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:31,912 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-19 04:47:31,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:31,934 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-19 04:47:31,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:31,944 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-19 04:47:31,949 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:31,949 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:47:31,949 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-11-19 04:47:31,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [29456311] [2023-11-19 04:47:31,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [29456311] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:47:31,950 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:47:31,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-19 04:47:31,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919541829] [2023-11-19 04:47:31,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:47:31,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:47:31,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-11-19 04:47:31,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:47:31,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:47:31,957 INFO L87 Difference]: Start difference. First operand 490 states and 1392 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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) [2023-11-19 04:47:32,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:47:32,286 INFO L93 Difference]: Finished difference Result 488 states and 1388 transitions. [2023-11-19 04:47:32,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:47:32,287 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 2 [2023-11-19 04:47:32,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:47:32,293 INFO L225 Difference]: With dead ends: 488 [2023-11-19 04:47:32,293 INFO L226 Difference]: Without dead ends: 488 [2023-11-19 04:47:32,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:47:32,296 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 4 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:47:32,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 0 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:47:32,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2023-11-19 04:47:32,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 488. [2023-11-19 04:47:32,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 321 states have (on average 4.32398753894081) internal successors, (1388), 487 states have internal predecessors, (1388), 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) [2023-11-19 04:47:32,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1388 transitions. [2023-11-19 04:47:32,351 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1388 transitions. Word has length 2 [2023-11-19 04:47:32,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:47:32,351 INFO L495 AbstractCegarLoop]: Abstraction has 488 states and 1388 transitions. [2023-11-19 04:47:32,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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) [2023-11-19 04:47:32,351 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1388 transitions. [2023-11-19 04:47:32,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-19 04:47:32,352 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:47:32,352 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-19 04:47:32,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:47:32,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:32,554 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-11-19 04:47:32,555 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:47:32,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1031083, now seen corresponding path program 1 times [2023-11-19 04:47:32,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-11-19 04:47:32,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1979370736] [2023-11-19 04:47:32,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:32,556 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:32,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat [2023-11-19 04:47:32,557 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-11-19 04:47:32,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2023-11-19 04:47:32,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:32,635 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 04:47:32,637 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:32,655 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-19 04:47:32,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:32,672 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:32,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:32,682 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:32,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:32,692 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:32,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:32,715 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 1 [2023-11-19 04:47:32,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:32,727 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:32,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:32,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:47:33,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:33,008 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-11-19 04:47:33,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1979370736] [2023-11-19 04:47:33,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1979370736] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:47:33,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [462180661] [2023-11-19 04:47:33,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:33,009 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2023-11-19 04:47:33,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/cvc4 [2023-11-19 04:47:33,014 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2023-11-19 04:47:33,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2023-11-19 04:47:33,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:33,148 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 04:47:33,149 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:33,180 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-11-19 04:47:33,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,214 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 1 [2023-11-19 04:47:33,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,233 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:33,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,243 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:33,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,253 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:33,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,266 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:33,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:33,315 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:47:33,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:33,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [462180661] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:47:33,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630497662] [2023-11-19 04:47:33,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:33,394 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:47:33,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:47:33,402 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:47:33,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:47:33,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:33,486 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:47:33,487 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:33,510 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-11-19 04:47:33,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,532 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:33,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,545 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:33,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,553 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:33,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,577 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 1 [2023-11-19 04:47:33,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:33,589 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:33,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:33,635 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:47:33,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:33,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630497662] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:47:33,772 INFO L185 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2023-11-19 04:47:33,772 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2, 2, 2, 2] total 6 [2023-11-19 04:47:33,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144079614] [2023-11-19 04:47:33,773 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2023-11-19 04:47:33,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 04:47:33,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-11-19 04:47:33,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 04:47:33,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2023-11-19 04:47:33,774 INFO L87 Difference]: Start difference. First operand 488 states and 1388 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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) [2023-11-19 04:47:35,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:47:35,414 INFO L93 Difference]: Finished difference Result 494 states and 1406 transitions. [2023-11-19 04:47:35,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:47:35,415 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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 3 [2023-11-19 04:47:35,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:47:35,419 INFO L225 Difference]: With dead ends: 494 [2023-11-19 04:47:35,419 INFO L226 Difference]: Without dead ends: 494 [2023-11-19 04:47:35,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=32, Invalid=40, Unknown=0, NotChecked=0, Total=72 [2023-11-19 04:47:35,420 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-11-19 04:47:35,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 0 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-11-19 04:47:35,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2023-11-19 04:47:35,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 494. [2023-11-19 04:47:35,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 327 states have (on average 4.299694189602446) internal successors, (1406), 493 states have internal predecessors, (1406), 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) [2023-11-19 04:47:35,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 1406 transitions. [2023-11-19 04:47:35,451 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 1406 transitions. Word has length 3 [2023-11-19 04:47:35,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:47:35,452 INFO L495 AbstractCegarLoop]: Abstraction has 494 states and 1406 transitions. [2023-11-19 04:47:35,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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) [2023-11-19 04:47:35,453 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 1406 transitions. [2023-11-19 04:47:35,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-19 04:47:35,454 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:47:35,462 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-19 04:47:35,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:47:35,681 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2023-11-19 04:47:35,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:47:36,079 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/cvc4 --incremental --print-success --lang smt,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:36,080 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-11-19 04:47:36,080 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:47:36,080 INFO L85 PathProgramCache]: Analyzing trace with hash 1032723, now seen corresponding path program 1 times [2023-11-19 04:47:36,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-11-19 04:47:36,080 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1753903246] [2023-11-19 04:47:36,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:36,081 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:36,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat [2023-11-19 04:47:36,082 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-11-19 04:47:36,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2023-11-19 04:47:36,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:36,179 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 04:47:36,182 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:36,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:36,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:36,225 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-11-19 04:47:36,245 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 10 treesize of output 8 [2023-11-19 04:47:36,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:36,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:36,277 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-19 04:47:36,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:36,313 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 [2023-11-19 04:47:36,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:36,370 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:47:36,370 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-11-19 04:47:36,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1753903246] [2023-11-19 04:47:36,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1753903246] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:47:36,370 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:47:36,370 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:47:36,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958011770] [2023-11-19 04:47:36,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:47:36,371 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 04:47:36,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-11-19 04:47:36,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 04:47:36,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 04:47:36,372 INFO L87 Difference]: Start difference. First operand 494 states and 1406 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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) [2023-11-19 04:47:36,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:47:36,667 INFO L93 Difference]: Finished difference Result 395 states and 1079 transitions. [2023-11-19 04:47:36,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:47:36,668 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2023-11-19 04:47:36,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:47:36,672 INFO L225 Difference]: With dead ends: 395 [2023-11-19 04:47:36,672 INFO L226 Difference]: Without dead ends: 395 [2023-11-19 04:47:36,672 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 04:47:36,673 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 43 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:47:36,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 0 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:47:36,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2023-11-19 04:47:36,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 395. [2023-11-19 04:47:36,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 274 states have (on average 3.937956204379562) internal successors, (1079), 394 states have internal predecessors, (1079), 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) [2023-11-19 04:47:36,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 1079 transitions. [2023-11-19 04:47:36,690 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 1079 transitions. Word has length 3 [2023-11-19 04:47:36,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:47:36,691 INFO L495 AbstractCegarLoop]: Abstraction has 395 states and 1079 transitions. [2023-11-19 04:47:36,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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) [2023-11-19 04:47:36,691 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 1079 transitions. [2023-11-19 04:47:36,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-19 04:47:36,691 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:47:36,691 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-19 04:47:36,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2023-11-19 04:47:36,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:36,894 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-11-19 04:47:36,894 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:47:36,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1032724, now seen corresponding path program 1 times [2023-11-19 04:47:36,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-11-19 04:47:36,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1938885270] [2023-11-19 04:47:36,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:36,895 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:36,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat [2023-11-19 04:47:36,896 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-11-19 04:47:36,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2023-11-19 04:47:36,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:36,984 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:47:36,986 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:37,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,019 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 17 treesize of output 11 [2023-11-19 04:47:37,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,075 INFO L349 Elim1Store]: treesize reduction 19, result has 26.9 percent of original size [2023-11-19 04:47:37,076 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 26 treesize of output 15 [2023-11-19 04:47:37,130 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-11-19 04:47:37,131 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 [2023-11-19 04:47:37,155 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:37,155 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:47:37,155 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-11-19 04:47:37,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1938885270] [2023-11-19 04:47:37,156 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1938885270] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:47:37,156 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:47:37,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-19 04:47:37,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042562996] [2023-11-19 04:47:37,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:47:37,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:47:37,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-11-19 04:47:37,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:47:37,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:47:37,157 INFO L87 Difference]: Start difference. First operand 395 states and 1079 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2023-11-19 04:47:37,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:47:37,453 INFO L93 Difference]: Finished difference Result 296 states and 752 transitions. [2023-11-19 04:47:37,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:47:37,454 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2023-11-19 04:47:37,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:47:37,457 INFO L225 Difference]: With dead ends: 296 [2023-11-19 04:47:37,457 INFO L226 Difference]: Without dead ends: 296 [2023-11-19 04:47:37,457 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:47:37,458 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 41 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:47:37,458 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 0 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:47:37,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2023-11-19 04:47:37,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 296. [2023-11-19 04:47:37,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 221 states have (on average 3.4027149321266967) internal successors, (752), 295 states have internal predecessors, (752), 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) [2023-11-19 04:47:37,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 752 transitions. [2023-11-19 04:47:37,471 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 752 transitions. Word has length 3 [2023-11-19 04:47:37,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:47:37,471 INFO L495 AbstractCegarLoop]: Abstraction has 296 states and 752 transitions. [2023-11-19 04:47:37,471 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2023-11-19 04:47:37,472 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 752 transitions. [2023-11-19 04:47:37,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-19 04:47:37,472 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:47:37,472 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-19 04:47:37,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2023-11-19 04:47:37,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:37,675 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-11-19 04:47:37,675 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:47:37,675 INFO L85 PathProgramCache]: Analyzing trace with hash 992471192, now seen corresponding path program 1 times [2023-11-19 04:47:37,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-11-19 04:47:37,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1848210674] [2023-11-19 04:47:37,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:37,676 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:37,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat [2023-11-19 04:47:37,681 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-11-19 04:47:37,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2023-11-19 04:47:37,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:37,788 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 04:47:37,790 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:37,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,820 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 10 treesize of output 8 [2023-11-19 04:47:37,833 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-11-19 04:47:37,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,856 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-19 04:47:37,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,875 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-19 04:47:37,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:37,917 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 [2023-11-19 04:47:37,988 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:37,989 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:47:37,989 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-11-19 04:47:37,989 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1848210674] [2023-11-19 04:47:37,989 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1848210674] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:47:37,989 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:47:37,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:47:37,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239986762] [2023-11-19 04:47:37,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:47:37,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 04:47:37,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-11-19 04:47:37,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 04:47:37,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 04:47:37,991 INFO L87 Difference]: Start difference. First operand 296 states and 752 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2023-11-19 04:47:38,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:47:38,339 INFO L93 Difference]: Finished difference Result 275 states and 707 transitions. [2023-11-19 04:47:38,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:47:38,340 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 5 [2023-11-19 04:47:38,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:47:38,343 INFO L225 Difference]: With dead ends: 275 [2023-11-19 04:47:38,343 INFO L226 Difference]: Without dead ends: 275 [2023-11-19 04:47:38,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:47:38,344 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 76 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:47:38,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 0 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:47:38,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2023-11-19 04:47:38,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 275. [2023-11-19 04:47:38,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 214 states have (on average 3.303738317757009) internal successors, (707), 274 states have internal predecessors, (707), 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) [2023-11-19 04:47:38,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 707 transitions. [2023-11-19 04:47:38,356 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 707 transitions. Word has length 5 [2023-11-19 04:47:38,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:47:38,357 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 707 transitions. [2023-11-19 04:47:38,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2023-11-19 04:47:38,358 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 707 transitions. [2023-11-19 04:47:38,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-19 04:47:38,358 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:47:38,358 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-19 04:47:38,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2023-11-19 04:47:38,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:38,561 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-11-19 04:47:38,561 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:47:38,562 INFO L85 PathProgramCache]: Analyzing trace with hash 992471194, now seen corresponding path program 1 times [2023-11-19 04:47:38,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-11-19 04:47:38,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [738180991] [2023-11-19 04:47:38,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:47:38,562 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:38,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat [2023-11-19 04:47:38,563 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-11-19 04:47:38,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2023-11-19 04:47:38,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:47:38,653 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 04:47:38,655 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:38,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:38,694 INFO L349 Elim1Store]: treesize reduction 19, result has 26.9 percent of original size [2023-11-19 04:47:38,694 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 26 treesize of output 15 [2023-11-19 04:47:38,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:38,708 INFO L349 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2023-11-19 04:47:38,708 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 1 [2023-11-19 04:47:38,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:38,720 INFO L349 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2023-11-19 04:47:38,720 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 1 case distinctions, treesize of input 21 treesize of output 1 [2023-11-19 04:47:38,745 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-11-19 04:47:38,746 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 [2023-11-19 04:47:38,758 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:38,758 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:47:38,758 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-11-19 04:47:38,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [738180991] [2023-11-19 04:47:38,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [738180991] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:47:38,759 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:47:38,759 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-19 04:47:38,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958260161] [2023-11-19 04:47:38,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:47:38,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:47:38,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-11-19 04:47:38,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:47:38,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:47:38,760 INFO L87 Difference]: Start difference. First operand 275 states and 707 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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) [2023-11-19 04:47:38,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:47:38,961 INFO L93 Difference]: Finished difference Result 254 states and 662 transitions. [2023-11-19 04:47:38,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:47:38,962 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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 5 [2023-11-19 04:47:38,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:47:38,964 INFO L225 Difference]: With dead ends: 254 [2023-11-19 04:47:38,964 INFO L226 Difference]: Without dead ends: 254 [2023-11-19 04:47:38,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:47:38,965 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 35 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:47:38,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 0 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:47:38,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2023-11-19 04:47:38,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 254. [2023-11-19 04:47:38,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 207 states have (on average 3.1980676328502415) internal successors, (662), 253 states have internal predecessors, (662), 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) [2023-11-19 04:47:38,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 662 transitions. [2023-11-19 04:47:38,976 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 662 transitions. Word has length 5 [2023-11-19 04:47:38,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:47:38,976 INFO L495 AbstractCegarLoop]: Abstraction has 254 states and 662 transitions. [2023-11-19 04:47:38,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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) [2023-11-19 04:47:38,977 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 662 transitions. [2023-11-19 04:47:38,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 04:47:38,977 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:47:38,978 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1] [2023-11-19 04:47:38,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2023-11-19 04:47:39,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:39,181 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 45 more)] === [2023-11-19 04:47:39,181 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:47:39,181 INFO L85 PathProgramCache]: Analyzing trace with hash 655262154, now seen corresponding path program 2 times [2023-11-19 04:47:39,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-11-19 04:47:39,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1013441606] [2023-11-19 04:47:39,182 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-19 04:47:39,182 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-11-19 04:47:39,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat [2023-11-19 04:47:39,183 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-11-19 04:47:39,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2023-11-19 04:47:39,275 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-19 04:47:39,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:47:39,279 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-19 04:47:39,280 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:39,296 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-11-19 04:47:39,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:39,320 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 1 [2023-11-19 04:47:39,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:39,332 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:39,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:39,339 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:39,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:39,347 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:39,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:39,357 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:39,538 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:39,538 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:47:40,098 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:40,098 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-11-19 04:47:40,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1013441606] [2023-11-19 04:47:40,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1013441606] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:47:40,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1588064186] [2023-11-19 04:47:40,098 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-19 04:47:40,099 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2023-11-19 04:47:40,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/cvc4 [2023-11-19 04:47:40,099 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2023-11-19 04:47:40,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2023-11-19 04:47:40,257 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-19 04:47:40,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:47:40,259 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-19 04:47:40,261 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:40,294 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 7 [2023-11-19 04:47:40,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:40,308 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:40,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:40,316 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:40,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:40,325 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:40,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:40,334 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:40,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:40,344 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:40,458 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:40,458 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:47:41,275 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:41,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1588064186] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:47:41,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713833225] [2023-11-19 04:47:41,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-19 04:47:41,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:47:41,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:47:41,277 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:47:41,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1cfdd952-1d89-4cd1-8752-a1e4be4b34b3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-19 04:47:41,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-19 04:47:41,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:47:41,382 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-19 04:47:41,384 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:47:41,397 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-19 04:47:41,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:41,409 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:41,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:41,417 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 04:47:41,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:41,427 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:41,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:41,463 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 1 [2023-11-19 04:47:41,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:47:41,473 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-19 04:47:41,547 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:41,548 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:47:41,715 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:47:41,716 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1713833225] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:47:41,716 INFO L185 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2023-11-19 04:47:41,716 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 15 [2023-11-19 04:47:41,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724109158] [2023-11-19 04:47:41,716 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2023-11-19 04:47:41,717 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 04:47:41,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-11-19 04:47:41,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 04:47:41,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=182, Unknown=0, NotChecked=0, Total=272 [2023-11-19 04:47:41,718 INFO L87 Difference]: Start difference. First operand 254 states and 662 transitions. Second operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 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)