./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:09:12,262 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:09:12,342 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-64bit-Taipan_Default.epf [2023-11-23 21:09:12,347 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:09:12,348 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:09:12,374 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:09:12,375 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:09:12,376 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:09:12,376 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:09:12,377 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:09:12,378 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:09:12,378 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:09:12,379 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:09:12,379 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:09:12,380 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:09:12,381 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:09:12,381 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:09:12,382 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:09:12,382 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:09:12,383 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:09:12,383 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:09:12,384 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:09:12,385 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:09:12,386 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:09:12,386 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:09:12,386 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:09:12,387 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:09:12,387 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:09:12,388 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:09:12,388 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:09:12,389 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:09:12,389 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:09:12,390 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:09:12,390 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:09:12,403 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:09:12,404 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:09:12,404 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:09:12,404 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:09:12,405 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:09:12,405 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:09:12,405 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:09:12,406 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:09:12,406 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:09:12,406 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:09:12,406 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_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb [2023-11-23 21:09:12,639 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:09:12,660 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:09:12,662 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:09:12,664 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:09:12,664 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:09:12,666 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2023-11-23 21:09:15,849 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:09:16,337 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:09:16,338 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2023-11-23 21:09:16,378 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/data/2931d7f32/f9f452e68bca4712be3bc394712d1d44/FLAG66e6082dc [2023-11-23 21:09:16,400 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/data/2931d7f32/f9f452e68bca4712be3bc394712d1d44 [2023-11-23 21:09:16,407 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:09:16,410 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:09:16,414 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:09:16,414 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:09:16,420 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:09:16,421 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:09:16" (1/1) ... [2023-11-23 21:09:16,423 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@94c1c22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:16, skipping insertion in model container [2023-11-23 21:09:16,423 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:09:16" (1/1) ... [2023-11-23 21:09:16,534 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:09:17,705 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i[144238,144251] [2023-11-23 21:09:17,732 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:09:17,792 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:09:18,180 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i[144238,144251] [2023-11-23 21:09:18,186 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:09:18,235 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:09:18,236 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18 WrapperNode [2023-11-23 21:09:18,236 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:09:18,237 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:09:18,237 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:09:18,238 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:09:18,245 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,311 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,428 INFO L138 Inliner]: procedures = 115, calls = 823, calls flagged for inlining = 54, calls inlined = 53, statements flattened = 2097 [2023-11-23 21:09:18,428 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:09:18,429 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:09:18,430 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:09:18,430 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:09:18,440 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,440 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,452 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,453 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,534 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,592 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,620 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,646 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,670 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:09:18,674 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:09:18,674 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:09:18,675 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:09:18,676 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (1/1) ... [2023-11-23 21:09:18,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:09:18,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:18,710 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:09:18,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:09:18,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2023-11-23 21:09:18,753 INFO L130 BoogieDeclarations]: Found specification of procedure usb_submit_urb [2023-11-23 21:09:18,753 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_submit_urb [2023-11-23 21:09:18,754 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2023-11-23 21:09:18,754 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2023-11-23 21:09:18,754 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2023-11-23 21:09:18,754 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2023-11-23 21:09:18,756 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:09:18,756 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2023-11-23 21:09:18,757 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2023-11-23 21:09:18,757 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_xfer_int [2023-11-23 21:09:18,757 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_xfer_int [2023-11-23 21:09:18,757 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memcpy [2023-11-23 21:09:18,757 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memcpy [2023-11-23 21:09:18,757 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2023-11-23 21:09:18,758 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2023-11-23 21:09:18,758 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2023-11-23 21:09:18,758 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2023-11-23 21:09:18,758 INFO L130 BoogieDeclarations]: Found specification of procedure usb_kill_urb [2023-11-23 21:09:18,759 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_kill_urb [2023-11-23 21:09:18,759 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2023-11-23 21:09:18,759 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2023-11-23 21:09:18,759 INFO L130 BoogieDeclarations]: Found specification of procedure usb_get_serial_port_data [2023-11-23 21:09:18,759 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_get_serial_port_data [2023-11-23 21:09:18,760 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:09:18,760 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_tty [2023-11-23 21:09:18,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_tty [2023-11-23 21:09:18,761 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2023-11-23 21:09:18,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2023-11-23 21:09:18,762 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-23 21:09:18,762 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-23 21:09:18,762 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_detach_1 [2023-11-23 21:09:18,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_detach_1 [2023-11-23 21:09:18,762 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:09:18,763 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2023-11-23 21:09:18,763 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2023-11-23 21:09:18,764 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:09:18,764 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_tiocmset [2023-11-23 21:09:18,764 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_tiocmset [2023-11-23 21:09:18,764 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_tiocmget [2023-11-23 21:09:18,764 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_tiocmget [2023-11-23 21:09:18,764 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:09:18,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:09:18,765 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:09:18,765 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_ioctl [2023-11-23 21:09:18,765 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_ioctl [2023-11-23 21:09:18,765 INFO L130 BoogieDeclarations]: Found specification of procedure usb_control_msg [2023-11-23 21:09:18,765 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_control_msg [2023-11-23 21:09:18,765 INFO L130 BoogieDeclarations]: Found specification of procedure usb_free_urb [2023-11-23 21:09:18,766 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_free_urb [2023-11-23 21:09:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_write_room [2023-11-23 21:09:18,766 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_write_room [2023-11-23 21:09:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:09:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:09:18,766 INFO L130 BoogieDeclarations]: Found specification of procedure printk [2023-11-23 21:09:18,767 INFO L138 BoogieDeclarations]: Found implementation of procedure printk [2023-11-23 21:09:18,767 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_init_termios [2023-11-23 21:09:18,767 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_init_termios [2023-11-23 21:09:18,767 INFO L130 BoogieDeclarations]: Found specification of procedure usb_serial_deregister [2023-11-23 21:09:18,768 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_serial_deregister [2023-11-23 21:09:18,768 INFO L130 BoogieDeclarations]: Found specification of procedure kzalloc [2023-11-23 21:09:18,768 INFO L138 BoogieDeclarations]: Found implementation of procedure kzalloc [2023-11-23 21:09:18,769 INFO L130 BoogieDeclarations]: Found specification of procedure kmalloc [2023-11-23 21:09:18,770 INFO L138 BoogieDeclarations]: Found implementation of procedure kmalloc [2023-11-23 21:09:18,770 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:09:18,770 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_set_termios [2023-11-23 21:09:18,770 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_set_termios [2023-11-23 21:09:18,770 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2023-11-23 21:09:18,770 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:09:18,770 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:09:19,241 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:09:19,247 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:09:19,626 INFO L775 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2023-11-23 21:09:23,107 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:09:23,997 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:09:23,997 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-23 21:09:23,999 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:09:23 BoogieIcfgContainer [2023-11-23 21:09:23,999 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:09:24,003 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:09:24,003 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:09:24,006 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:09:24,007 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:09:16" (1/3) ... [2023-11-23 21:09:24,009 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33779d40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:09:24, skipping insertion in model container [2023-11-23 21:09:24,009 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:18" (2/3) ... [2023-11-23 21:09:24,009 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33779d40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:09:24, skipping insertion in model container [2023-11-23 21:09:24,010 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:09:23" (3/3) ... [2023-11-23 21:09:24,012 INFO L112 eAbstractionObserver]: Analyzing ICFG linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2023-11-23 21:09:24,032 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:09:24,032 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:09:24,118 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:09:24,126 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@45271ba6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:09:24,126 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:09:24,133 INFO L276 IsEmpty]: Start isEmpty. Operand has 531 states, 354 states have (on average 1.3898305084745763) internal successors, (492), 361 states have internal predecessors, (492), 149 states have call successors, (149), 27 states have call predecessors, (149), 26 states have return successors, (144), 144 states have call predecessors, (144), 144 states have call successors, (144) [2023-11-23 21:09:24,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-11-23 21:09:24,152 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:24,153 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:24,154 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:24,159 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:24,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1164336215, now seen corresponding path program 1 times [2023-11-23 21:09:24,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:24,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112676601] [2023-11-23 21:09:24,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:24,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:24,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:24,850 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-23 21:09:24,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:24,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112676601] [2023-11-23 21:09:24,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112676601] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:24,853 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:09:24,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:09:24,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31813288] [2023-11-23 21:09:24,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:24,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:09:24,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:24,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:09:24,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:09:24,897 INFO L87 Difference]: Start difference. First operand has 531 states, 354 states have (on average 1.3898305084745763) internal successors, (492), 361 states have internal predecessors, (492), 149 states have call successors, (149), 27 states have call predecessors, (149), 26 states have return successors, (144), 144 states have call predecessors, (144), 144 states have call successors, (144) Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2023-11-23 21:09:26,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:26,916 INFO L93 Difference]: Finished difference Result 1091 states and 1616 transitions. [2023-11-23 21:09:26,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:09:26,919 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 100 [2023-11-23 21:09:26,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:26,942 INFO L225 Difference]: With dead ends: 1091 [2023-11-23 21:09:26,943 INFO L226 Difference]: Without dead ends: 571 [2023-11-23 21:09:26,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:09:26,963 INFO L413 NwaCegarLoop]: 708 mSDtfsCounter, 113 mSDsluCounter, 575 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 1283 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:26,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 1283 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-11-23 21:09:26,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2023-11-23 21:09:27,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 571. [2023-11-23 21:09:27,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 571 states, 389 states have (on average 1.3701799485861184) internal successors, (533), 391 states have internal predecessors, (533), 149 states have call successors, (149), 32 states have call predecessors, (149), 32 states have return successors, (149), 149 states have call predecessors, (149), 149 states have call successors, (149) [2023-11-23 21:09:27,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 831 transitions. [2023-11-23 21:09:27,078 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 831 transitions. Word has length 100 [2023-11-23 21:09:27,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:27,079 INFO L495 AbstractCegarLoop]: Abstraction has 571 states and 831 transitions. [2023-11-23 21:09:27,080 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2023-11-23 21:09:27,080 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 831 transitions. [2023-11-23 21:09:27,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-11-23 21:09:27,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:27,095 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:27,095 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:09:27,096 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:27,096 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:27,096 INFO L85 PathProgramCache]: Analyzing trace with hash 1027127910, now seen corresponding path program 1 times [2023-11-23 21:09:27,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:27,097 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914021552] [2023-11-23 21:09:27,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:27,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:27,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:27,729 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2023-11-23 21:09:27,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:27,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914021552] [2023-11-23 21:09:27,730 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914021552] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:27,730 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:09:27,730 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:09:27,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112149273] [2023-11-23 21:09:27,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:27,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:09:27,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:27,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:09:27,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:09:27,734 INFO L87 Difference]: Start difference. First operand 571 states and 831 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-23 21:09:30,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:30,710 INFO L93 Difference]: Finished difference Result 1325 states and 1931 transitions. [2023-11-23 21:09:30,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:09:30,711 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) Word has length 154 [2023-11-23 21:09:30,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:30,720 INFO L225 Difference]: With dead ends: 1325 [2023-11-23 21:09:30,721 INFO L226 Difference]: Without dead ends: 788 [2023-11-23 21:09:30,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:09:30,724 INFO L413 NwaCegarLoop]: 753 mSDtfsCounter, 290 mSDsluCounter, 575 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 1328 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:30,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [290 Valid, 1328 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2023-11-23 21:09:30,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 788 states. [2023-11-23 21:09:30,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 788 to 786. [2023-11-23 21:09:30,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 786 states, 547 states have (on average 1.3491773308957953) internal successors, (738), 550 states have internal predecessors, (738), 187 states have call successors, (187), 51 states have call predecessors, (187), 51 states have return successors, (187), 187 states have call predecessors, (187), 187 states have call successors, (187) [2023-11-23 21:09:30,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 786 states to 786 states and 1112 transitions. [2023-11-23 21:09:30,802 INFO L78 Accepts]: Start accepts. Automaton has 786 states and 1112 transitions. Word has length 154 [2023-11-23 21:09:30,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:30,803 INFO L495 AbstractCegarLoop]: Abstraction has 786 states and 1112 transitions. [2023-11-23 21:09:30,803 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-23 21:09:30,804 INFO L276 IsEmpty]: Start isEmpty. Operand 786 states and 1112 transitions. [2023-11-23 21:09:30,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2023-11-23 21:09:30,808 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:30,809 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:30,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:09:30,809 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:30,819 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:30,820 INFO L85 PathProgramCache]: Analyzing trace with hash -412040330, now seen corresponding path program 1 times [2023-11-23 21:09:30,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:30,820 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139866581] [2023-11-23 21:09:30,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:30,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:31,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:31,492 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2023-11-23 21:09:31,492 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:31,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139866581] [2023-11-23 21:09:31,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139866581] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:31,493 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:09:31,493 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:09:31,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795821874] [2023-11-23 21:09:31,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:31,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:09:31,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:31,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:09:31,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:09:31,497 INFO L87 Difference]: Start difference. First operand 786 states and 1112 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 2 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-23 21:09:34,325 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2023-11-23 21:09:35,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:35,075 INFO L93 Difference]: Finished difference Result 1525 states and 2158 transitions. [2023-11-23 21:09:35,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:09:35,077 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 2 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 164 [2023-11-23 21:09:35,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:35,093 INFO L225 Difference]: With dead ends: 1525 [2023-11-23 21:09:35,093 INFO L226 Difference]: Without dead ends: 1523 [2023-11-23 21:09:35,094 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:09:35,100 INFO L413 NwaCegarLoop]: 724 mSDtfsCounter, 674 mSDsluCounter, 672 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 674 SdHoareTripleChecker+Valid, 1396 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:35,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [674 Valid, 1396 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2023-11-23 21:09:35,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1523 states. [2023-11-23 21:09:35,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1523 to 1522. [2023-11-23 21:09:35,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1522 states, 1064 states have (on average 1.3533834586466165) internal successors, (1440), 1071 states have internal predecessors, (1440), 357 states have call successors, (357), 100 states have call predecessors, (357), 100 states have return successors, (357), 356 states have call predecessors, (357), 357 states have call successors, (357) [2023-11-23 21:09:35,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1522 states to 1522 states and 2154 transitions. [2023-11-23 21:09:35,243 INFO L78 Accepts]: Start accepts. Automaton has 1522 states and 2154 transitions. Word has length 164 [2023-11-23 21:09:35,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:35,244 INFO L495 AbstractCegarLoop]: Abstraction has 1522 states and 2154 transitions. [2023-11-23 21:09:35,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 2 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-23 21:09:35,246 INFO L276 IsEmpty]: Start isEmpty. Operand 1522 states and 2154 transitions. [2023-11-23 21:09:35,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2023-11-23 21:09:35,252 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:35,253 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:35,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:09:35,253 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:35,254 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:35,254 INFO L85 PathProgramCache]: Analyzing trace with hash 2056567611, now seen corresponding path program 1 times [2023-11-23 21:09:35,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:35,256 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248466761] [2023-11-23 21:09:35,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:35,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:35,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:35,870 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2023-11-23 21:09:35,870 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:35,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248466761] [2023-11-23 21:09:35,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248466761] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:35,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626664610] [2023-11-23 21:09:35,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:35,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:35,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:35,876 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:35,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:09:36,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:36,534 INFO L262 TraceCheckSpWp]: Trace formula consists of 2041 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:09:36,550 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:36,797 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 120 proven. 6 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-23 21:09:36,797 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:37,009 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2023-11-23 21:09:37,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626664610] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:37,009 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:09:37,010 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 5 [2023-11-23 21:09:37,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873989391] [2023-11-23 21:09:37,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:37,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:09:37,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:37,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:09:37,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:09:37,012 INFO L87 Difference]: Start difference. First operand 1522 states and 2154 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-23 21:09:40,170 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2023-11-23 21:09:40,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:40,267 INFO L93 Difference]: Finished difference Result 3452 states and 4892 transitions. [2023-11-23 21:09:40,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:09:40,268 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) Word has length 171 [2023-11-23 21:09:40,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:40,283 INFO L225 Difference]: With dead ends: 3452 [2023-11-23 21:09:40,284 INFO L226 Difference]: Without dead ends: 1964 [2023-11-23 21:09:40,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 341 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:09:40,292 INFO L413 NwaCegarLoop]: 640 mSDtfsCounter, 555 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 555 SdHoareTripleChecker+Valid, 980 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:40,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [555 Valid, 980 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2023-11-23 21:09:40,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1964 states. [2023-11-23 21:09:40,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1964 to 1962. [2023-11-23 21:09:40,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1962 states, 1384 states have (on average 1.370664739884393) internal successors, (1897), 1393 states have internal predecessors, (1897), 433 states have call successors, (433), 144 states have call predecessors, (433), 144 states have return successors, (433), 432 states have call predecessors, (433), 433 states have call successors, (433) [2023-11-23 21:09:40,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1962 states to 1962 states and 2763 transitions. [2023-11-23 21:09:40,456 INFO L78 Accepts]: Start accepts. Automaton has 1962 states and 2763 transitions. Word has length 171 [2023-11-23 21:09:40,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:40,458 INFO L495 AbstractCegarLoop]: Abstraction has 1962 states and 2763 transitions. [2023-11-23 21:09:40,458 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-23 21:09:40,458 INFO L276 IsEmpty]: Start isEmpty. Operand 1962 states and 2763 transitions. [2023-11-23 21:09:40,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2023-11-23 21:09:40,466 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:40,472 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:40,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:40,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:40,693 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:40,693 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:40,693 INFO L85 PathProgramCache]: Analyzing trace with hash 476569962, now seen corresponding path program 1 times [2023-11-23 21:09:40,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:40,693 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744541489] [2023-11-23 21:09:40,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:40,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:40,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:41,306 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 18 proven. 9 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2023-11-23 21:09:41,307 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:41,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744541489] [2023-11-23 21:09:41,307 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744541489] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:41,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18749278] [2023-11-23 21:09:41,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:41,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:41,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:41,313 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:41,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:09:42,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:42,032 INFO L262 TraceCheckSpWp]: Trace formula consists of 2260 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:09:42,052 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:42,253 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 158 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-23 21:09:42,253 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:42,497 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2023-11-23 21:09:42,498 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18749278] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:42,498 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:09:42,498 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 5 [2023-11-23 21:09:42,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071685590] [2023-11-23 21:09:42,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:42,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:09:42,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:42,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:09:42,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:09:42,501 INFO L87 Difference]: Start difference. First operand 1962 states and 2763 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 3 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2023-11-23 21:09:44,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:44,074 INFO L93 Difference]: Finished difference Result 4468 states and 6316 transitions. [2023-11-23 21:09:44,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:09:44,075 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 3 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) Word has length 208 [2023-11-23 21:09:44,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:44,092 INFO L225 Difference]: With dead ends: 4468 [2023-11-23 21:09:44,092 INFO L226 Difference]: Without dead ends: 2540 [2023-11-23 21:09:44,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 415 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:09:44,099 INFO L413 NwaCegarLoop]: 661 mSDtfsCounter, 555 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 555 SdHoareTripleChecker+Valid, 1001 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:44,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [555 Valid, 1001 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-11-23 21:09:44,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2540 states. [2023-11-23 21:09:44,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2540 to 2538. [2023-11-23 21:09:44,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2538 states, 1826 states have (on average 1.3855421686746987) internal successors, (2530), 1839 states have internal predecessors, (2530), 519 states have call successors, (519), 192 states have call predecessors, (519), 192 states have return successors, (519), 518 states have call predecessors, (519), 519 states have call successors, (519) [2023-11-23 21:09:44,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2538 states to 2538 states and 3568 transitions. [2023-11-23 21:09:44,280 INFO L78 Accepts]: Start accepts. Automaton has 2538 states and 3568 transitions. Word has length 208 [2023-11-23 21:09:44,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:44,281 INFO L495 AbstractCegarLoop]: Abstraction has 2538 states and 3568 transitions. [2023-11-23 21:09:44,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 3 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2023-11-23 21:09:44,281 INFO L276 IsEmpty]: Start isEmpty. Operand 2538 states and 3568 transitions. [2023-11-23 21:09:44,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2023-11-23 21:09:44,288 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:44,288 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:44,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:44,512 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:44,512 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:44,512 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:44,513 INFO L85 PathProgramCache]: Analyzing trace with hash 1641156077, now seen corresponding path program 1 times [2023-11-23 21:09:44,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:44,513 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136017608] [2023-11-23 21:09:44,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:44,513 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:44,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:45,536 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-11-23 21:09:45,537 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:45,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136017608] [2023-11-23 21:09:45,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136017608] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:45,538 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161931452] [2023-11-23 21:09:45,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:45,539 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:45,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:45,540 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:45,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:09:46,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:46,357 INFO L262 TraceCheckSpWp]: Trace formula consists of 2354 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:09:46,377 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:46,675 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 189 proven. 18 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2023-11-23 21:09:46,675 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:47,034 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2023-11-23 21:09:47,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161931452] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:47,035 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:09:47,035 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 5] total 10 [2023-11-23 21:09:47,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440240377] [2023-11-23 21:09:47,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:47,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:09:47,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:47,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:09:47,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:09:47,038 INFO L87 Difference]: Start difference. First operand 2538 states and 3568 transitions. Second operand has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 3 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2023-11-23 21:09:51,696 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2023-11-23 21:09:51,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:51,932 INFO L93 Difference]: Finished difference Result 5674 states and 8033 transitions. [2023-11-23 21:09:51,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:09:51,933 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 3 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 226 [2023-11-23 21:09:51,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:51,958 INFO L225 Difference]: With dead ends: 5674 [2023-11-23 21:09:51,958 INFO L226 Difference]: Without dead ends: 3170 [2023-11-23 21:09:51,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 447 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:09:51,968 INFO L413 NwaCegarLoop]: 764 mSDtfsCounter, 678 mSDsluCounter, 592 mSDsCounter, 0 mSdLazyCounter, 699 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 700 SdHoareTripleChecker+Valid, 1356 SdHoareTripleChecker+Invalid, 782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:51,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [700 Valid, 1356 Invalid, 782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 699 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2023-11-23 21:09:51,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3170 states. [2023-11-23 21:09:52,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3170 to 2670. [2023-11-23 21:09:52,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2670 states, 1938 states have (on average 1.3942208462332302) internal successors, (2702), 1953 states have internal predecessors, (2702), 529 states have call successors, (529), 202 states have call predecessors, (529), 202 states have return successors, (529), 528 states have call predecessors, (529), 529 states have call successors, (529) [2023-11-23 21:09:52,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2670 states to 2670 states and 3760 transitions. [2023-11-23 21:09:52,263 INFO L78 Accepts]: Start accepts. Automaton has 2670 states and 3760 transitions. Word has length 226 [2023-11-23 21:09:52,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:52,264 INFO L495 AbstractCegarLoop]: Abstraction has 2670 states and 3760 transitions. [2023-11-23 21:09:52,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 3 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2023-11-23 21:09:52,264 INFO L276 IsEmpty]: Start isEmpty. Operand 2670 states and 3760 transitions. [2023-11-23 21:09:52,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2023-11-23 21:09:52,271 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:52,272 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:52,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:52,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:52,497 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:52,497 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:52,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1951352395, now seen corresponding path program 1 times [2023-11-23 21:09:52,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:52,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021314833] [2023-11-23 21:09:52,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:52,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:52,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:53,607 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-11-23 21:09:53,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:53,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021314833] [2023-11-23 21:09:53,608 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021314833] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:53,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681028158] [2023-11-23 21:09:53,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:53,609 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:53,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:53,610 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:53,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:09:54,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:54,387 INFO L262 TraceCheckSpWp]: Trace formula consists of 2431 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:09:54,396 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:54,527 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2023-11-23 21:09:54,527 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:09:54,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681028158] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:54,527 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:09:54,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2023-11-23 21:09:54,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878768195] [2023-11-23 21:09:54,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:54,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:09:54,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:54,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:09:54,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:09:54,530 INFO L87 Difference]: Start difference. First operand 2670 states and 3760 transitions. Second operand has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) [2023-11-23 21:09:57,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:57,974 INFO L93 Difference]: Finished difference Result 5812 states and 8269 transitions. [2023-11-23 21:09:57,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:09:57,975 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) Word has length 234 [2023-11-23 21:09:57,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:57,997 INFO L225 Difference]: With dead ends: 5812 [2023-11-23 21:09:57,997 INFO L226 Difference]: Without dead ends: 3176 [2023-11-23 21:09:58,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:09:58,006 INFO L413 NwaCegarLoop]: 972 mSDtfsCounter, 480 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 1636 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:58,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [490 Valid, 1636 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 582 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2023-11-23 21:09:58,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3176 states. [2023-11-23 21:09:58,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3176 to 2968. [2023-11-23 21:09:58,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2968 states, 2196 states have (on average 1.3916211293260474) internal successors, (3056), 2215 states have internal predecessors, (3056), 549 states have call successors, (549), 222 states have call predecessors, (549), 222 states have return successors, (549), 548 states have call predecessors, (549), 549 states have call successors, (549) [2023-11-23 21:09:58,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2968 states to 2968 states and 4154 transitions. [2023-11-23 21:09:58,280 INFO L78 Accepts]: Start accepts. Automaton has 2968 states and 4154 transitions. Word has length 234 [2023-11-23 21:09:58,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:58,281 INFO L495 AbstractCegarLoop]: Abstraction has 2968 states and 4154 transitions. [2023-11-23 21:09:58,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) [2023-11-23 21:09:58,282 INFO L276 IsEmpty]: Start isEmpty. Operand 2968 states and 4154 transitions. [2023-11-23 21:09:58,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2023-11-23 21:09:58,290 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:58,290 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:58,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:58,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:58,509 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:58,509 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:58,509 INFO L85 PathProgramCache]: Analyzing trace with hash 1972970184, now seen corresponding path program 1 times [2023-11-23 21:09:58,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:58,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926413780] [2023-11-23 21:09:58,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:58,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:58,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:59,698 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 350 trivial. 0 not checked. [2023-11-23 21:09:59,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:59,698 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926413780] [2023-11-23 21:09:59,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926413780] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:59,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380441161] [2023-11-23 21:09:59,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:59,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:59,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:59,701 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:59,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09967882-3152-4f46-b5e2-fc9e6d7d7b47/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:10:00,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:00,533 INFO L262 TraceCheckSpWp]: Trace formula consists of 2730 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:10:00,545 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:00,598 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 152 proven. 0 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2023-11-23 21:10:00,599 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:10:00,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380441161] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:10:00,599 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:10:00,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-11-23 21:10:00,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170194998] [2023-11-23 21:10:00,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:10:00,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:10:00,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:00,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:10:00,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:10:00,602 INFO L87 Difference]: Start difference. First operand 2968 states and 4154 transitions. Second operand has 5 states, 5 states have (on average 23.8) internal successors, (119), 5 states have internal predecessors, (119), 2 states have call successors, (34), 2 states have call predecessors, (34), 2 states have return successors, (33), 2 states have call predecessors, (33), 2 states have call successors, (33)