java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/SifaC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-55cd5f5 [2019-08-15 00:40:52,878 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-15 00:40:52,880 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-15 00:40:52,890 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-15 00:40:52,890 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-15 00:40:52,891 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-15 00:40:52,892 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-15 00:40:52,894 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-15 00:40:52,896 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-15 00:40:52,896 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-15 00:40:52,897 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-15 00:40:52,898 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-15 00:40:52,899 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-15 00:40:52,900 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-15 00:40:52,901 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-15 00:40:52,902 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-15 00:40:52,902 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-15 00:40:52,903 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-15 00:40:52,905 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-15 00:40:52,907 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-15 00:40:52,909 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-15 00:40:52,910 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-15 00:40:52,911 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-15 00:40:52,912 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-15 00:40:52,914 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-15 00:40:52,917 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-15 00:40:52,918 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-15 00:40:52,919 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-15 00:40:52,920 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-15 00:40:52,921 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-15 00:40:52,922 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-15 00:40:52,922 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-15 00:40:52,923 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-15 00:40:52,923 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-15 00:40:52,924 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-15 00:40:52,925 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-15 00:40:52,926 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-08-15 00:40:52,940 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-15 00:40:52,941 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-15 00:40:52,942 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-15 00:40:52,944 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-15 00:40:52,944 INFO L138 SettingsManager]: * Use SBE=true [2019-08-15 00:40:52,944 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-15 00:40:52,944 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-15 00:40:52,944 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-15 00:40:52,945 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-15 00:40:52,945 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-15 00:40:52,945 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-15 00:40:52,947 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-15 00:40:52,948 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-15 00:40:52,948 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-15 00:40:52,948 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-15 00:40:52,948 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-15 00:40:52,948 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-15 00:40:52,949 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-15 00:40:52,949 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-15 00:40:52,951 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-15 00:40:52,951 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-15 00:40:52,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-15 00:40:52,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-15 00:40:52,952 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-15 00:40:52,952 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-15 00:40:52,953 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-15 00:40:52,953 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-15 00:40:52,953 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-15 00:40:52,953 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-15 00:40:52,993 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-15 00:40:53,006 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-15 00:40:53,009 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-15 00:40:53,011 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-15 00:40:53,011 INFO L275 PluginConnector]: CDTParser initialized [2019-08-15 00:40:53,012 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2019-08-15 00:40:53,071 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae7fcb3aa/69f68f39bdac49fab638ccd67b641ef4/FLAGc4297fa74 [2019-08-15 00:40:53,614 INFO L306 CDTParser]: Found 1 translation units. [2019-08-15 00:40:53,615 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_lcr.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2019-08-15 00:40:53,627 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae7fcb3aa/69f68f39bdac49fab638ccd67b641ef4/FLAGc4297fa74 [2019-08-15 00:40:53,891 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae7fcb3aa/69f68f39bdac49fab638ccd67b641ef4 [2019-08-15 00:40:53,900 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-15 00:40:53,901 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-15 00:40:53,902 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-15 00:40:53,903 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-15 00:40:53,906 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-15 00:40:53,907 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.08 12:40:53" (1/1) ... [2019-08-15 00:40:53,910 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60ee258 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:53, skipping insertion in model container [2019-08-15 00:40:53,910 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.08 12:40:53" (1/1) ... [2019-08-15 00:40:53,921 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-15 00:40:53,970 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-15 00:40:54,197 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-15 00:40:54,213 INFO L188 MainTranslator]: Completed pre-run [2019-08-15 00:40:54,370 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-15 00:40:54,399 INFO L192 MainTranslator]: Completed translation [2019-08-15 00:40:54,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54 WrapperNode [2019-08-15 00:40:54,400 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-15 00:40:54,401 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-15 00:40:54,401 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-15 00:40:54,401 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-15 00:40:54,411 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54" (1/1) ... [2019-08-15 00:40:54,411 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54" (1/1) ... [2019-08-15 00:40:54,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54" (1/1) ... [2019-08-15 00:40:54,420 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54" (1/1) ... [2019-08-15 00:40:54,431 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54" (1/1) ... [2019-08-15 00:40:54,442 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54" (1/1) ... [2019-08-15 00:40:54,445 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54" (1/1) ... [2019-08-15 00:40:54,448 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-15 00:40:54,449 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-15 00:40:54,449 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-15 00:40:54,449 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-15 00:40:54,450 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.08 12:40:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-15 00:40:54,511 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-15 00:40:54,512 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-15 00:40:54,512 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-15 00:40:54,512 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-15 00:40:54,512 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2019-08-15 00:40:54,512 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-08-15 00:40:54,512 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2019-08-15 00:40:54,513 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-08-15 00:40:54,513 INFO L130 BoogieDeclarations]: Found specification of procedure read [2019-08-15 00:40:54,513 INFO L130 BoogieDeclarations]: Found specification of procedure write [2019-08-15 00:40:54,513 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2019-08-15 00:40:54,513 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2019-08-15 00:40:54,513 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2019-08-15 00:40:54,514 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2019-08-15 00:40:54,514 INFO L130 BoogieDeclarations]: Found specification of procedure init [2019-08-15 00:40:54,514 INFO L130 BoogieDeclarations]: Found specification of procedure check [2019-08-15 00:40:54,514 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-15 00:40:54,514 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-15 00:40:54,515 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-15 00:40:55,067 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-15 00:40:55,069 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-08-15 00:40:55,071 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.08 12:40:55 BoogieIcfgContainer [2019-08-15 00:40:55,071 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-15 00:40:55,071 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-15 00:40:55,071 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-15 00:40:55,072 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-15 00:40:55,073 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.08 12:40:55" (1/1) ... [2019-08-15 00:40:55,452 WARN L188 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2019-08-15 00:40:55,664 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2019-08-15 00:54:18,137 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-15 00:54:18,139 INFO L168 Benchmark]: Toolchain (without parser) took 804237.69 ms. Allocated memory was 130.5 MB in the beginning and 3.2 GB in the end (delta: 3.1 GB). Free memory was 85.4 MB in the beginning and 1.3 GB in the end (delta: -1.2 GB). Peak memory consumption was 3.1 GB. Max. memory is 7.1 GB. [2019-08-15 00:54:18,140 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 130.5 MB. Free memory was 104.7 MB in the beginning and 104.5 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-08-15 00:54:18,142 INFO L168 Benchmark]: CACSL2BoogieTranslator took 497.81 ms. Allocated memory was 130.5 MB in the beginning and 197.7 MB in the end (delta: 67.1 MB). Free memory was 85.2 MB in the beginning and 171.2 MB in the end (delta: -86.0 MB). Peak memory consumption was 28.1 MB. Max. memory is 7.1 GB. [2019-08-15 00:54:18,142 INFO L168 Benchmark]: Boogie Preprocessor took 48.07 ms. Allocated memory is still 197.7 MB. Free memory was 171.2 MB in the beginning and 169.2 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. [2019-08-15 00:54:18,143 INFO L168 Benchmark]: RCFGBuilder took 621.92 ms. Allocated memory is still 197.7 MB. Free memory was 169.2 MB in the beginning and 133.5 MB in the end (delta: 35.7 MB). Peak memory consumption was 35.7 MB. Max. memory is 7.1 GB. [2019-08-15 00:54:18,144 INFO L168 Benchmark]: Symbolic Interpretation took 803066.45 ms. Allocated memory was 197.7 MB in the beginning and 3.2 GB in the end (delta: 3.0 GB). Free memory was 132.9 MB in the beginning and 1.3 GB in the end (delta: -1.1 GB). Peak memory consumption was 3.1 GB. Max. memory is 7.1 GB. [2019-08-15 00:54:18,148 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - UnprovableResult [Line: 230]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: Over-approximation of reachable states at this location is 6110538#(and (= ~__return_3032~0 main_~check__tmp~0) (= 0 (mod main_~assert__arg~0 256)) (= main_~__tmp_1~0 main_~assert__arg~0) (= main_~main__c1~0 ~__return_3032~0) (= main_~__tmp_1~0 (ite (= main_~main__c1~0 0) 0 1))). Possible FailurePath: * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 130.5 MB. Free memory was 104.7 MB in the beginning and 104.5 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 497.81 ms. Allocated memory was 130.5 MB in the beginning and 197.7 MB in the end (delta: 67.1 MB). Free memory was 85.2 MB in the beginning and 171.2 MB in the end (delta: -86.0 MB). Peak memory consumption was 28.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 48.07 ms. Allocated memory is still 197.7 MB. Free memory was 171.2 MB in the beginning and 169.2 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 621.92 ms. Allocated memory is still 197.7 MB. Free memory was 169.2 MB in the beginning and 133.5 MB in the end (delta: 35.7 MB). Peak memory consumption was 35.7 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 803066.45 ms. Allocated memory was 197.7 MB in the beginning and 3.2 GB in the end (delta: 3.0 GB). Free memory was 132.9 MB in the beginning and 1.3 GB in the end (delta: -1.1 GB). Peak memory consumption was 3.1 GB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...