./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 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/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_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --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 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:23:52,217 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:23:52,219 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:23:52,268 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:23:52,268 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:23:52,272 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:23:52,273 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:23:52,277 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:23:52,280 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:23:52,285 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:23:52,286 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:23:52,288 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:23:52,288 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:23:52,291 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:23:52,294 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:23:52,299 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:23:52,301 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:23:52,302 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:23:52,304 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:23:52,314 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:23:52,315 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:23:52,317 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:23:52,319 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:23:52,320 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:23:52,329 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:23:52,330 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:23:52,330 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:23:52,332 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:23:52,332 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:23:52,334 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:23:52,335 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:23:52,336 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:23:52,338 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:23:52,338 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:23:52,339 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:23:52,340 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:23:52,340 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:23:52,340 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:23:52,341 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:23:52,342 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:23:52,342 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:23:52,343 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-25 18:23:52,369 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:23:52,370 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:23:52,370 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:23:52,370 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:23:52,371 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:23:52,371 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:23:52,371 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:23:52,372 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:23:52,372 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:23:52,372 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:23:52,372 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:23:52,372 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:23:52,373 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:23:52,373 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:23:52,373 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:23:52,373 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:23:52,373 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:23:52,374 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:23:52,374 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:23:52,375 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:23:52,375 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:23:52,375 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:23:52,375 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:23:52,375 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:23:52,376 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:23:52,376 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:23:52,376 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:23:52,376 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:23:52,377 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:23:52,377 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:23:52,377 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:23:52,377 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:23:52,377 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:23:52,378 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:23:52,378 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:23:52,378 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:23:52,378 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:23:52,378 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:23:52,379 INFO L138 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_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb [2021-11-25 18:23:52,620 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:23:52,639 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:23:52,642 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:23:52,643 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:23:52,643 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:23:52,644 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/../../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 [2021-11-25 18:23:52,716 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/data/3c7ec0ebc/42ecec38275447b19716c38603b7ecbb/FLAG3cb096645 [2021-11-25 18:23:53,486 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:23:53,487 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/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 [2021-11-25 18:23:53,538 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/data/3c7ec0ebc/42ecec38275447b19716c38603b7ecbb/FLAG3cb096645 [2021-11-25 18:23:53,726 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/data/3c7ec0ebc/42ecec38275447b19716c38603b7ecbb [2021-11-25 18:23:53,729 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:23:53,732 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:23:53,737 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:23:53,737 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:23:53,740 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:23:53,742 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:23:53" (1/1) ... [2021-11-25 18:23:53,743 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f97e0d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:53, skipping insertion in model container [2021-11-25 18:23:53,743 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:23:53" (1/1) ... [2021-11-25 18:23:53,751 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:23:53,838 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:23:54,753 WARN L230 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_43ce663e-39da-48fb-9c37-88c45b0806ff/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] [2021-11-25 18:23:54,769 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:23:54,796 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:23:55,148 WARN L230 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_43ce663e-39da-48fb-9c37-88c45b0806ff/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] [2021-11-25 18:23:55,152 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:23:55,206 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:23:55,206 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55 WrapperNode [2021-11-25 18:23:55,206 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:23:55,207 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:23:55,207 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:23:55,207 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:23:55,220 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,266 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,441 INFO L137 Inliner]: procedures = 115, calls = 787, calls flagged for inlining = 53, calls inlined = 52, statements flattened = 1905 [2021-11-25 18:23:55,441 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:23:55,442 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:23:55,443 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:23:55,443 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:23:55,452 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,452 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,499 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,499 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,598 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,624 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,645 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,667 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:23:55,668 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:23:55,669 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:23:55,669 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:23:55,671 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (1/1) ... [2021-11-25 18:23:55,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:23:55,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:55,708 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:23:55,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:23:55,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-25 18:23:55,754 INFO L130 BoogieDeclarations]: Found specification of procedure usb_submit_urb [2021-11-25 18:23:55,758 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_submit_urb [2021-11-25 18:23:55,758 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-25 18:23:55,759 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-25 18:23:55,759 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-25 18:23:55,759 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-25 18:23:55,759 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 18:23:55,759 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-25 18:23:55,760 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-25 18:23:55,760 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_xfer_int [2021-11-25 18:23:55,760 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_xfer_int [2021-11-25 18:23:55,760 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memcpy [2021-11-25 18:23:55,760 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memcpy [2021-11-25 18:23:55,760 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2021-11-25 18:23:55,761 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2021-11-25 18:23:55,761 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-25 18:23:55,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-25 18:23:55,761 INFO L130 BoogieDeclarations]: Found specification of procedure usb_kill_urb [2021-11-25 18:23:55,762 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_kill_urb [2021-11-25 18:23:55,763 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2021-11-25 18:23:55,763 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2021-11-25 18:23:55,763 INFO L130 BoogieDeclarations]: Found specification of procedure usb_get_serial_port_data [2021-11-25 18:23:55,763 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_get_serial_port_data [2021-11-25 18:23:55,763 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 18:23:55,764 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_tty [2021-11-25 18:23:55,764 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_tty [2021-11-25 18:23:55,764 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-25 18:23:55,764 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-25 18:23:55,764 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 18:23:55,764 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 18:23:55,765 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_detach_1 [2021-11-25 18:23:55,765 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_detach_1 [2021-11-25 18:23:55,765 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 18:23:55,765 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-25 18:23:55,765 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-25 18:23:55,766 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:23:55,766 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_tiocmset [2021-11-25 18:23:55,766 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_tiocmset [2021-11-25 18:23:55,766 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_tiocmget [2021-11-25 18:23:55,766 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_tiocmget [2021-11-25 18:23:55,766 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 18:23:55,767 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-25 18:23:55,767 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-25 18:23:55,767 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_ioctl [2021-11-25 18:23:55,767 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_ioctl [2021-11-25 18:23:55,767 INFO L130 BoogieDeclarations]: Found specification of procedure usb_control_msg [2021-11-25 18:23:55,767 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_control_msg [2021-11-25 18:23:55,767 INFO L130 BoogieDeclarations]: Found specification of procedure usb_free_urb [2021-11-25 18:23:55,767 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_free_urb [2021-11-25 18:23:55,768 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_write_room [2021-11-25 18:23:55,768 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_write_room [2021-11-25 18:23:55,768 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 18:23:55,768 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-25 18:23:55,768 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_init_termios [2021-11-25 18:23:55,768 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_init_termios [2021-11-25 18:23:55,768 INFO L130 BoogieDeclarations]: Found specification of procedure usb_serial_deregister [2021-11-25 18:23:55,768 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_serial_deregister [2021-11-25 18:23:55,769 INFO L130 BoogieDeclarations]: Found specification of procedure kzalloc [2021-11-25 18:23:55,769 INFO L138 BoogieDeclarations]: Found implementation of procedure kzalloc [2021-11-25 18:23:55,769 INFO L130 BoogieDeclarations]: Found specification of procedure kmalloc [2021-11-25 18:23:55,769 INFO L138 BoogieDeclarations]: Found implementation of procedure kmalloc [2021-11-25 18:23:55,769 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:23:55,769 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_set_termios [2021-11-25 18:23:55,769 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_set_termios [2021-11-25 18:23:55,770 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2021-11-25 18:23:55,770 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:23:55,770 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:23:56,259 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:23:56,262 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:23:56,654 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-25 18:23:59,990 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:24:00,459 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:24:00,459 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 18:24:00,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:24:00 BoogieIcfgContainer [2021-11-25 18:24:00,464 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:24:00,468 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:24:00,468 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:24:00,471 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:24:00,472 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:23:53" (1/3) ... [2021-11-25 18:24:00,472 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@128c11ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:24:00, skipping insertion in model container [2021-11-25 18:24:00,473 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:23:55" (2/3) ... [2021-11-25 18:24:00,473 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@128c11ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:24:00, skipping insertion in model container [2021-11-25 18:24:00,473 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:24:00" (3/3) ... [2021-11-25 18:24:00,475 INFO L111 eAbstractionObserver]: Analyzing ICFG linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-25 18:24:00,480 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:24:00,481 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:24:00,554 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:24:00,564 INFO L339 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=LoopsAndPotentialCycles, 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:24:00,564 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:24:00,613 INFO L276 IsEmpty]: Start isEmpty. Operand has 407 states, 266 states have (on average 1.3834586466165413) internal successors, (368), 273 states have internal predecessors, (368), 114 states have call successors, (114), 26 states have call predecessors, (114), 25 states have return successors, (109), 109 states have call predecessors, (109), 109 states have call successors, (109) [2021-11-25 18:24:00,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 18:24:00,645 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:00,646 INFO L514 BasicCegarLoop]: 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] [2021-11-25 18:24:00,647 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:00,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:00,653 INFO L85 PathProgramCache]: Analyzing trace with hash 850965209, now seen corresponding path program 1 times [2021-11-25 18:24:00,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:00,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574853729] [2021-11-25 18:24:00,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:00,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:00,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:01,172 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-25 18:24:01,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:01,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574853729] [2021-11-25 18:24:01,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574853729] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:24:01,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:24:01,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:24:01,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778612195] [2021-11-25 18:24:01,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:01,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:24:01,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:01,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:24:01,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:24:01,212 INFO L87 Difference]: Start difference. First operand has 407 states, 266 states have (on average 1.3834586466165413) internal successors, (368), 273 states have internal predecessors, (368), 114 states have call successors, (114), 26 states have call predecessors, (114), 25 states have return successors, (109), 109 states have call predecessors, (109), 109 states have call successors, (109) Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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) [2021-11-25 18:24:03,762 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:03,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:03,853 INFO L93 Difference]: Finished difference Result 839 states and 1224 transitions. [2021-11-25 18:24:03,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:24:03,855 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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 99 [2021-11-25 18:24:03,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:03,872 INFO L225 Difference]: With dead ends: 839 [2021-11-25 18:24:03,872 INFO L226 Difference]: Without dead ends: 443 [2021-11-25 18:24:03,880 INFO L932 BasicCegarLoop]: 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 [2021-11-25 18:24:03,883 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 109 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 885 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:03,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 885 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 257 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 18:24:03,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2021-11-25 18:24:03,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 443. [2021-11-25 18:24:03,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 299 states have (on average 1.3612040133779264) internal successors, (407), 301 states have internal predecessors, (407), 113 states have call successors, (113), 30 states have call predecessors, (113), 30 states have return successors, (113), 113 states have call predecessors, (113), 113 states have call successors, (113) [2021-11-25 18:24:03,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 633 transitions. [2021-11-25 18:24:04,000 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 633 transitions. Word has length 99 [2021-11-25 18:24:04,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:04,001 INFO L470 AbstractCegarLoop]: Abstraction has 443 states and 633 transitions. [2021-11-25 18:24:04,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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) [2021-11-25 18:24:04,001 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 633 transitions. [2021-11-25 18:24:04,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-25 18:24:04,012 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:04,012 INFO L514 BasicCegarLoop]: 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] [2021-11-25 18:24:04,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:24:04,013 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:04,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:04,013 INFO L85 PathProgramCache]: Analyzing trace with hash 494757028, now seen corresponding path program 1 times [2021-11-25 18:24:04,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:04,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297616807] [2021-11-25 18:24:04,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:04,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:04,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:04,414 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-11-25 18:24:04,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:04,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297616807] [2021-11-25 18:24:04,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297616807] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:24:04,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:24:04,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:24:04,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741585357] [2021-11-25 18:24:04,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:04,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:24:04,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:04,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:24:04,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:24:04,420 INFO L87 Difference]: Start difference. First operand 443 states and 633 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2021-11-25 18:24:06,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:06,684 INFO L93 Difference]: Finished difference Result 1040 states and 1490 transitions. [2021-11-25 18:24:06,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:24:06,685 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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 153 [2021-11-25 18:24:06,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:06,695 INFO L225 Difference]: With dead ends: 1040 [2021-11-25 18:24:06,695 INFO L226 Difference]: Without dead ends: 631 [2021-11-25 18:24:06,700 INFO L932 BasicCegarLoop]: 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 [2021-11-25 18:24:06,702 INFO L933 BasicCegarLoop]: 552 mSDtfsCounter, 245 mSDsluCounter, 447 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 927 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:06,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 927 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 18:24:06,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2021-11-25 18:24:06,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 629. [2021-11-25 18:24:06,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 629 states, 437 states have (on average 1.334096109839817) internal successors, (583), 440 states have internal predecessors, (583), 143 states have call successors, (143), 48 states have call predecessors, (143), 48 states have return successors, (143), 143 states have call predecessors, (143), 143 states have call successors, (143) [2021-11-25 18:24:06,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 629 states to 629 states and 869 transitions. [2021-11-25 18:24:06,782 INFO L78 Accepts]: Start accepts. Automaton has 629 states and 869 transitions. Word has length 153 [2021-11-25 18:24:06,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:06,783 INFO L470 AbstractCegarLoop]: Abstraction has 629 states and 869 transitions. [2021-11-25 18:24:06,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2021-11-25 18:24:06,785 INFO L276 IsEmpty]: Start isEmpty. Operand 629 states and 869 transitions. [2021-11-25 18:24:06,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 18:24:06,793 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:06,794 INFO L514 BasicCegarLoop]: 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] [2021-11-25 18:24:06,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:24:06,794 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:06,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:06,795 INFO L85 PathProgramCache]: Analyzing trace with hash 1706303792, now seen corresponding path program 1 times [2021-11-25 18:24:06,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:06,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308287541] [2021-11-25 18:24:06,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:06,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:06,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:07,172 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-25 18:24:07,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:07,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308287541] [2021-11-25 18:24:07,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308287541] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:24:07,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:24:07,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:24:07,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747397835] [2021-11-25 18:24:07,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:07,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:24:07,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:07,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:24:07,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:24:07,179 INFO L87 Difference]: Start difference. First operand 629 states and 869 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) [2021-11-25 18:24:08,773 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:10,079 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:10,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:10,218 INFO L93 Difference]: Finished difference Result 1214 states and 1677 transitions. [2021-11-25 18:24:10,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:24:10,219 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 [2021-11-25 18:24:10,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:10,229 INFO L225 Difference]: With dead ends: 1214 [2021-11-25 18:24:10,230 INFO L226 Difference]: Without dead ends: 1212 [2021-11-25 18:24:10,231 INFO L932 BasicCegarLoop]: 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 [2021-11-25 18:24:10,232 INFO L933 BasicCegarLoop]: 605 mSDtfsCounter, 485 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 485 SdHoareTripleChecker+Valid, 1073 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:10,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [485 Valid, 1073 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-11-25 18:24:10,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1212 states. [2021-11-25 18:24:10,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1212 to 1211. [2021-11-25 18:24:10,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1211 states, 846 states have (on average 1.339243498817967) internal successors, (1133), 853 states have internal predecessors, (1133), 270 states have call successors, (270), 94 states have call predecessors, (270), 94 states have return successors, (270), 269 states have call predecessors, (270), 270 states have call successors, (270) [2021-11-25 18:24:10,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1211 states to 1211 states and 1673 transitions. [2021-11-25 18:24:10,348 INFO L78 Accepts]: Start accepts. Automaton has 1211 states and 1673 transitions. Word has length 164 [2021-11-25 18:24:10,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:10,349 INFO L470 AbstractCegarLoop]: Abstraction has 1211 states and 1673 transitions. [2021-11-25 18:24:10,349 INFO L471 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) [2021-11-25 18:24:10,350 INFO L276 IsEmpty]: Start isEmpty. Operand 1211 states and 1673 transitions. [2021-11-25 18:24:10,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-25 18:24:10,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:10,353 INFO L514 BasicCegarLoop]: 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] [2021-11-25 18:24:10,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:24:10,354 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:10,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:10,355 INFO L85 PathProgramCache]: Analyzing trace with hash -880529444, now seen corresponding path program 1 times [2021-11-25 18:24:10,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:10,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928238645] [2021-11-25 18:24:10,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:10,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:10,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:10,646 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-11-25 18:24:10,646 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:10,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928238645] [2021-11-25 18:24:10,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928238645] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:10,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098146344] [2021-11-25 18:24:10,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:10,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:10,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:10,655 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:10,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:24:11,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:11,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 2112 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:24:11,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:11,624 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 120 proven. 6 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-25 18:24:11,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:12,004 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-11-25 18:24:12,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2098146344] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:12,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:24:12,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 5 [2021-11-25 18:24:12,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438666714] [2021-11-25 18:24:12,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:12,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:24:12,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:12,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:24:12,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:24:12,008 INFO L87 Difference]: Start difference. First operand 1211 states and 1673 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 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) [2021-11-25 18:24:13,798 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:14,870 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:14,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:14,953 INFO L93 Difference]: Finished difference Result 2772 states and 3840 transitions. [2021-11-25 18:24:14,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:24:14,953 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 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 170 [2021-11-25 18:24:14,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:14,968 INFO L225 Difference]: With dead ends: 2772 [2021-11-25 18:24:14,968 INFO L226 Difference]: Without dead ends: 1595 [2021-11-25 18:24:14,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:24:14,973 INFO L933 BasicCegarLoop]: 468 mSDtfsCounter, 411 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 411 SdHoareTripleChecker+Valid, 708 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:14,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [411 Valid, 708 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-25 18:24:14,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1595 states. [2021-11-25 18:24:15,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1595 to 1593. [2021-11-25 18:24:15,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1593 states, 1126 states have (on average 1.3605683836589697) internal successors, (1532), 1135 states have internal predecessors, (1532), 330 states have call successors, (330), 136 states have call predecessors, (330), 136 states have return successors, (330), 329 states have call predecessors, (330), 330 states have call successors, (330) [2021-11-25 18:24:15,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1593 states to 1593 states and 2192 transitions. [2021-11-25 18:24:15,095 INFO L78 Accepts]: Start accepts. Automaton has 1593 states and 2192 transitions. Word has length 170 [2021-11-25 18:24:15,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:15,096 INFO L470 AbstractCegarLoop]: Abstraction has 1593 states and 2192 transitions. [2021-11-25 18:24:15,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 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) [2021-11-25 18:24:15,096 INFO L276 IsEmpty]: Start isEmpty. Operand 1593 states and 2192 transitions. [2021-11-25 18:24:15,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-25 18:24:15,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:15,106 INFO L514 BasicCegarLoop]: 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] [2021-11-25 18:24:15,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:15,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:15,323 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:15,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:15,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1519650637, now seen corresponding path program 1 times [2021-11-25 18:24:15,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:15,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256305619] [2021-11-25 18:24:15,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:15,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:15,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:15,562 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 18 proven. 9 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-25 18:24:15,563 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:15,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256305619] [2021-11-25 18:24:15,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256305619] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:15,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68360677] [2021-11-25 18:24:15,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:15,564 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:15,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:15,567 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:15,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:24:16,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:16,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 2335 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:24:16,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:16,611 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 158 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-25 18:24:16,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:17,067 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2021-11-25 18:24:17,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68360677] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:17,068 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:24:17,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 5 [2021-11-25 18:24:17,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15093538] [2021-11-25 18:24:17,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:17,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:24:17,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:17,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:24:17,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:24:17,071 INFO L87 Difference]: Start difference. First operand 1593 states and 2192 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 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) [2021-11-25 18:24:18,839 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.26s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:18,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:18,912 INFO L93 Difference]: Finished difference Result 3664 states and 5076 transitions. [2021-11-25 18:24:18,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:24:18,913 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 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 206 [2021-11-25 18:24:18,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:18,927 INFO L225 Difference]: With dead ends: 3664 [2021-11-25 18:24:18,927 INFO L226 Difference]: Without dead ends: 2105 [2021-11-25 18:24:18,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:24:18,933 INFO L933 BasicCegarLoop]: 484 mSDtfsCounter, 415 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 415 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:18,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [415 Valid, 722 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-25 18:24:18,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2105 states. [2021-11-25 18:24:19,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2105 to 2103. [2021-11-25 18:24:19,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2103 states, 1524 states have (on average 1.3799212598425197) internal successors, (2103), 1537 states have internal predecessors, (2103), 398 states have call successors, (398), 180 states have call predecessors, (398), 180 states have return successors, (398), 397 states have call predecessors, (398), 398 states have call successors, (398) [2021-11-25 18:24:19,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2103 states to 2103 states and 2899 transitions. [2021-11-25 18:24:19,058 INFO L78 Accepts]: Start accepts. Automaton has 2103 states and 2899 transitions. Word has length 206 [2021-11-25 18:24:19,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:19,059 INFO L470 AbstractCegarLoop]: Abstraction has 2103 states and 2899 transitions. [2021-11-25 18:24:19,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 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) [2021-11-25 18:24:19,060 INFO L276 IsEmpty]: Start isEmpty. Operand 2103 states and 2899 transitions. [2021-11-25 18:24:19,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-11-25 18:24:19,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:19,066 INFO L514 BasicCegarLoop]: 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] [2021-11-25 18:24:19,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:19,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:19,287 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:19,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:19,287 INFO L85 PathProgramCache]: Analyzing trace with hash -78185036, now seen corresponding path program 1 times [2021-11-25 18:24:19,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:19,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048135018] [2021-11-25 18:24:19,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:19,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:19,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:19,538 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-11-25 18:24:19,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:19,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048135018] [2021-11-25 18:24:19,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048135018] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:19,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299361995] [2021-11-25 18:24:19,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:19,539 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:19,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:19,540 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:19,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:24:20,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:20,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 2435 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:24:20,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:20,697 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-25 18:24:20,697 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:24:20,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299361995] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:24:20,698 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:24:20,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2021-11-25 18:24:20,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967211207] [2021-11-25 18:24:20,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:20,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:24:20,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:20,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:24:20,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:24:20,700 INFO L87 Difference]: Start difference. First operand 2103 states and 2899 transitions. Second operand has 5 states, 5 states have (on average 18.0) internal successors, (90), 5 states have internal predecessors, (90), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 18:24:23,298 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:24,468 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:25,584 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:27,829 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.26s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:29,188 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:29,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:29,352 INFO L93 Difference]: Finished difference Result 6237 states and 8581 transitions. [2021-11-25 18:24:29,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:24:29,353 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 18.0) internal successors, (90), 5 states have internal predecessors, (90), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 224 [2021-11-25 18:24:29,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:29,379 INFO L225 Difference]: With dead ends: 6237 [2021-11-25 18:24:29,379 INFO L226 Difference]: Without dead ends: 4036 [2021-11-25 18:24:29,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:24:29,389 INFO L933 BasicCegarLoop]: 911 mSDtfsCounter, 520 mSDsluCounter, 2688 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 3211 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:29,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [521 Valid, 3211 Invalid, 575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 571 Invalid, 0 Unknown, 0 Unchecked, 8.4s Time] [2021-11-25 18:24:29,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4036 states. [2021-11-25 18:24:29,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4036 to 3943. [2021-11-25 18:24:29,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3943 states, 2874 states have (on average 1.3778705636743216) internal successors, (3960), 2885 states have internal predecessors, (3960), 743 states have call successors, (743), 325 states have call predecessors, (743), 325 states have return successors, (743), 732 states have call predecessors, (743), 743 states have call successors, (743) [2021-11-25 18:24:29,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3943 states to 3943 states and 5446 transitions. [2021-11-25 18:24:29,655 INFO L78 Accepts]: Start accepts. Automaton has 3943 states and 5446 transitions. Word has length 224 [2021-11-25 18:24:29,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:29,655 INFO L470 AbstractCegarLoop]: Abstraction has 3943 states and 5446 transitions. [2021-11-25 18:24:29,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 18.0) internal successors, (90), 5 states have internal predecessors, (90), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 18:24:29,656 INFO L276 IsEmpty]: Start isEmpty. Operand 3943 states and 5446 transitions. [2021-11-25 18:24:29,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-25 18:24:29,663 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:29,663 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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] [2021-11-25 18:24:29,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:29,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:29,876 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:29,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:29,877 INFO L85 PathProgramCache]: Analyzing trace with hash 37320089, now seen corresponding path program 1 times [2021-11-25 18:24:29,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:29,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89771425] [2021-11-25 18:24:29,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:29,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:30,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:30,196 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 374 trivial. 0 not checked. [2021-11-25 18:24:30,196 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:30,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89771425] [2021-11-25 18:24:30,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [89771425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:30,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780939913] [2021-11-25 18:24:30,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:30,197 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:30,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:30,199 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:30,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:24:30,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:30,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 2587 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:24:30,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:31,336 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 219 proven. 18 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2021-11-25 18:24:31,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:31,962 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2021-11-25 18:24:31,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780939913] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:31,963 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:24:31,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 5] total 10 [2021-11-25 18:24:31,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889894356] [2021-11-25 18:24:31,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:31,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:24:31,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:31,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:24:31,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:24:31,966 INFO L87 Difference]: Start difference. First operand 3943 states and 5446 transitions. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 18:24:34,193 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:34,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:34,845 INFO L93 Difference]: Finished difference Result 8941 states and 12467 transitions. [2021-11-25 18:24:34,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:24:34,846 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) Word has length 236 [2021-11-25 18:24:34,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:34,879 INFO L225 Difference]: With dead ends: 8941 [2021-11-25 18:24:34,879 INFO L226 Difference]: Without dead ends: 5032 [2021-11-25 18:24:34,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:24:34,892 INFO L933 BasicCegarLoop]: 564 mSDtfsCounter, 523 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 542 SdHoareTripleChecker+Valid, 1057 SdHoareTripleChecker+Invalid, 765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:34,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [542 Valid, 1057 Invalid, 765 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 683 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-25 18:24:34,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5032 states. [2021-11-25 18:24:35,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5032 to 4141. [2021-11-25 18:24:35,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4141 states, 3060 states have (on average 1.3908496732026143) internal successors, (4256), 3071 states have internal predecessors, (4256), 749 states have call successors, (749), 331 states have call predecessors, (749), 331 states have return successors, (749), 738 states have call predecessors, (749), 749 states have call successors, (749) [2021-11-25 18:24:35,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4141 states to 4141 states and 5754 transitions. [2021-11-25 18:24:35,109 INFO L78 Accepts]: Start accepts. Automaton has 4141 states and 5754 transitions. Word has length 236 [2021-11-25 18:24:35,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:35,110 INFO L470 AbstractCegarLoop]: Abstraction has 4141 states and 5754 transitions. [2021-11-25 18:24:35,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 18:24:35,110 INFO L276 IsEmpty]: Start isEmpty. Operand 4141 states and 5754 transitions. [2021-11-25 18:24:35,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-11-25 18:24:35,118 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:35,118 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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] [2021-11-25 18:24:35,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:35,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:35,347 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:35,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:35,347 INFO L85 PathProgramCache]: Analyzing trace with hash 820364439, now seen corresponding path program 1 times [2021-11-25 18:24:35,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:35,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417180164] [2021-11-25 18:24:35,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:35,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:35,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:35,618 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 374 trivial. 0 not checked. [2021-11-25 18:24:35,618 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:35,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417180164] [2021-11-25 18:24:35,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417180164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:35,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973334351] [2021-11-25 18:24:35,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:35,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:35,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:35,620 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:35,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:24:36,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:36,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 2682 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:24:36,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:36,641 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-25 18:24:36,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:24:36,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973334351] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:24:36,642 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:24:36,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-25 18:24:36,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571281151] [2021-11-25 18:24:36,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:36,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:24:36,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:36,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:24:36,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:24:36,644 INFO L87 Difference]: Start difference. First operand 4141 states and 5754 transitions. Second operand has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 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) [2021-11-25 18:24:38,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:38,917 INFO L93 Difference]: Finished difference Result 9124 states and 12879 transitions. [2021-11-25 18:24:38,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:24:38,918 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 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 238 [2021-11-25 18:24:38,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:38,949 INFO L225 Difference]: With dead ends: 9124 [2021-11-25 18:24:38,950 INFO L226 Difference]: Without dead ends: 5017 [2021-11-25 18:24:38,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:24:38,962 INFO L933 BasicCegarLoop]: 712 mSDtfsCounter, 379 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 387 SdHoareTripleChecker+Valid, 1158 SdHoareTripleChecker+Invalid, 609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:38,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [387 Valid, 1158 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 18:24:38,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5017 states. [2021-11-25 18:24:39,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5017 to 4605. [2021-11-25 18:24:39,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4605 states, 3500 states have (on average 1.3908571428571428) internal successors, (4868), 3511 states have internal predecessors, (4868), 761 states have call successors, (761), 343 states have call predecessors, (761), 343 states have return successors, (761), 750 states have call predecessors, (761), 761 states have call successors, (761) [2021-11-25 18:24:39,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4605 states to 4605 states and 6390 transitions. [2021-11-25 18:24:39,272 INFO L78 Accepts]: Start accepts. Automaton has 4605 states and 6390 transitions. Word has length 238 [2021-11-25 18:24:39,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:39,272 INFO L470 AbstractCegarLoop]: Abstraction has 4605 states and 6390 transitions. [2021-11-25 18:24:39,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 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) [2021-11-25 18:24:39,274 INFO L276 IsEmpty]: Start isEmpty. Operand 4605 states and 6390 transitions. [2021-11-25 18:24:39,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2021-11-25 18:24:39,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:39,284 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 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] [2021-11-25 18:24:39,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:39,506 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:39,507 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:39,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:39,507 INFO L85 PathProgramCache]: Analyzing trace with hash -460643796, now seen corresponding path program 1 times [2021-11-25 18:24:39,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:39,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801571621] [2021-11-25 18:24:39,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:39,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:39,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:39,772 INFO L134 CoverageAnalysis]: Checked inductivity of 426 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 412 trivial. 0 not checked. [2021-11-25 18:24:39,773 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:39,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801571621] [2021-11-25 18:24:39,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801571621] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:39,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739865347] [2021-11-25 18:24:39,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:39,774 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:39,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:39,775 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:39,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:24:40,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:40,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 2975 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:24:40,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:41,248 INFO L134 CoverageAnalysis]: Checked inductivity of 426 backedges. 188 proven. 0 refuted. 0 times theorem prover too weak. 238 trivial. 0 not checked. [2021-11-25 18:24:41,248 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:24:41,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739865347] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:24:41,248 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:24:41,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-25 18:24:41,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293309573] [2021-11-25 18:24:41,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:41,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:24:41,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:41,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:24:41,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:24:41,251 INFO L87 Difference]: Start difference. First operand 4605 states and 6390 transitions. Second operand has 4 states, 3 states have (on average 36.333333333333336) internal successors, (109), 4 states have internal predecessors, (109), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 2 states have call predecessors, (33), 2 states have call successors, (33) [2021-11-25 18:24:43,245 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:44,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:44,247 INFO L93 Difference]: Finished difference Result 9190 states and 12757 transitions. [2021-11-25 18:24:44,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:24:44,247 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 36.333333333333336) internal successors, (109), 4 states have internal predecessors, (109), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 2 states have call predecessors, (33), 2 states have call successors, (33) Word has length 274 [2021-11-25 18:24:44,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:44,275 INFO L225 Difference]: With dead ends: 9190 [2021-11-25 18:24:44,275 INFO L226 Difference]: Without dead ends: 4606 [2021-11-25 18:24:44,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:24:44,287 INFO L933 BasicCegarLoop]: 484 mSDtfsCounter, 1 mSDsluCounter, 1119 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 1440 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:44,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 1440 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2021-11-25 18:24:44,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4606 states. [2021-11-25 18:24:44,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4606 to 4606. [2021-11-25 18:24:44,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4606 states, 3501 states have (on average 1.3907455012853471) internal successors, (4869), 3512 states have internal predecessors, (4869), 761 states have call successors, (761), 343 states have call predecessors, (761), 343 states have return successors, (761), 750 states have call predecessors, (761), 761 states have call successors, (761) [2021-11-25 18:24:44,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4606 states to 4606 states and 6391 transitions. [2021-11-25 18:24:44,499 INFO L78 Accepts]: Start accepts. Automaton has 4606 states and 6391 transitions. Word has length 274 [2021-11-25 18:24:44,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:44,499 INFO L470 AbstractCegarLoop]: Abstraction has 4606 states and 6391 transitions. [2021-11-25 18:24:44,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 36.333333333333336) internal successors, (109), 4 states have internal predecessors, (109), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (33), 2 states have call predecessors, (33), 2 states have call successors, (33) [2021-11-25 18:24:44,500 INFO L276 IsEmpty]: Start isEmpty. Operand 4606 states and 6391 transitions. [2021-11-25 18:24:44,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2021-11-25 18:24:44,510 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:44,510 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 5, 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] [2021-11-25 18:24:44,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:44,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:44,739 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:44,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:44,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1772108526, now seen corresponding path program 1 times [2021-11-25 18:24:44,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:44,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826858898] [2021-11-25 18:24:44,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:44,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:44,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:45,045 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2021-11-25 18:24:45,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:45,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826858898] [2021-11-25 18:24:45,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826858898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:45,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099193498] [2021-11-25 18:24:45,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:45,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:45,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:45,048 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:45,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:24:45,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:45,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 3050 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 18:24:45,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:46,314 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 354 trivial. 0 not checked. [2021-11-25 18:24:46,314 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:24:46,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099193498] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:24:46,314 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:24:46,315 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5] total 9 [2021-11-25 18:24:46,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435836926] [2021-11-25 18:24:46,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:24:46,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:24:46,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:46,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:24:46,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:24:46,316 INFO L87 Difference]: Start difference. First operand 4606 states and 6391 transitions. Second operand has 7 states, 6 states have (on average 19.166666666666668) internal successors, (115), 5 states have internal predecessors, (115), 2 states have call successors, (33), 2 states have call predecessors, (33), 4 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-25 18:24:48,382 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 18:24:51,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:51,267 INFO L93 Difference]: Finished difference Result 10210 states and 14304 transitions. [2021-11-25 18:24:51,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:24:51,268 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 19.166666666666668) internal successors, (115), 5 states have internal predecessors, (115), 2 states have call successors, (33), 2 states have call predecessors, (33), 4 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) Word has length 279 [2021-11-25 18:24:51,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:51,316 INFO L225 Difference]: With dead ends: 10210 [2021-11-25 18:24:51,323 INFO L226 Difference]: Without dead ends: 5639 [2021-11-25 18:24:51,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:24:51,336 INFO L933 BasicCegarLoop]: 643 mSDtfsCounter, 135 mSDsluCounter, 3511 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 3712 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:51,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 3712 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2021-11-25 18:24:51,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5639 states. [2021-11-25 18:24:51,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5639 to 4630. [2021-11-25 18:24:51,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4630 states, 3517 states have (on average 1.3889678703440431) internal successors, (4885), 3528 states have internal predecessors, (4885), 761 states have call successors, (761), 343 states have call predecessors, (761), 351 states have return successors, (781), 758 states have call predecessors, (781), 761 states have call successors, (781) [2021-11-25 18:24:51,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4630 states to 4630 states and 6427 transitions. [2021-11-25 18:24:51,597 INFO L78 Accepts]: Start accepts. Automaton has 4630 states and 6427 transitions. Word has length 279 [2021-11-25 18:24:51,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:51,598 INFO L470 AbstractCegarLoop]: Abstraction has 4630 states and 6427 transitions. [2021-11-25 18:24:51,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 19.166666666666668) internal successors, (115), 5 states have internal predecessors, (115), 2 states have call successors, (33), 2 states have call predecessors, (33), 4 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-25 18:24:51,599 INFO L276 IsEmpty]: Start isEmpty. Operand 4630 states and 6427 transitions. [2021-11-25 18:24:51,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2021-11-25 18:24:51,608 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:51,609 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 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] [2021-11-25 18:24:51,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:51,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:24:51,822 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:51,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:51,823 INFO L85 PathProgramCache]: Analyzing trace with hash -917394235, now seen corresponding path program 1 times [2021-11-25 18:24:51,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:51,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436838951] [2021-11-25 18:24:51,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:51,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:51,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:52,092 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 463 trivial. 0 not checked. [2021-11-25 18:24:52,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:52,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436838951] [2021-11-25 18:24:52,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436838951] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:52,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414137328] [2021-11-25 18:24:52,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:52,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:52,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:52,095 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:52,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_43ce663e-39da-48fb-9c37-88c45b0806ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:24:52,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:24:52,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 3075 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:24:52,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:53,533 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 208 proven. 1 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2021-11-25 18:24:53,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:54,214 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 456 trivial. 0 not checked. [2021-11-25 18:24:54,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414137328] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:24:54,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007482559] [2021-11-25 18:24:54,240 INFO L159 IcfgInterpreter]: Started Sifa with 141 locations of interest [2021-11-25 18:24:54,240 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:24:54,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:24:54,251 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:24:54,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:25:11,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:25:12,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:25:12,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:25:12,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:25:12,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:25:12,420 INFO L244 Elim1Store]: Index analysis took 636 ms [2021-11-25 18:26:58,276 WARN L227 SmtUtils]: Spent 1.76m on a formula simplification. DAG size of input: 3175 DAG size of output: 1416 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-25 18:26:58,283 INFO L354 Elim1Store]: treesize reduction 11844, result has 17.5 percent of original size [2021-11-25 18:26:58,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 107 select indices, 107 select index equivalence classes, 5161 disjoint index pairs (out of 5671 index pairs), introduced 107 new quantified variables, introduced 618 case distinctions, treesize of input 594 treesize of output 2897 [2021-11-25 18:27:00,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:27:00,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:27:00,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:27:00,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:27:00,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:27:00,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 101 select indices, 101 select index equivalence classes, 5570 disjoint index pairs (out of 5050 index pairs), introduced 101 new quantified variables, introduced 0 case distinctions, treesize of input 524 treesize of output 834