java -ea -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/C-BIN-BPP-RCFG.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Termination-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/termination-crafted-lit/cstrspn_true-termination_true-no-overflow.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-aa41828 [2018-11-23 01:52:26,658 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-23 01:52:26,660 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-23 01:52:26,672 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-23 01:52:26,672 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-23 01:52:26,673 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-23 01:52:26,675 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-23 01:52:26,677 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-23 01:52:26,679 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-23 01:52:26,679 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-23 01:52:26,680 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-23 01:52:26,681 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-23 01:52:26,682 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-23 01:52:26,684 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-23 01:52:26,685 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-23 01:52:26,686 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-23 01:52:26,687 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-23 01:52:26,689 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-23 01:52:26,692 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-23 01:52:26,693 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-23 01:52:26,694 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-23 01:52:26,696 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-23 01:52:26,698 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-23 01:52:26,699 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-23 01:52:26,699 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-23 01:52:26,700 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-23 01:52:26,701 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-23 01:52:26,702 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-23 01:52:26,703 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-23 01:52:26,704 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-23 01:52:26,704 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-23 01:52:26,705 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-23 01:52:26,705 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-23 01:52:26,706 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-23 01:52:26,707 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-23 01:52:26,708 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-23 01:52:26,708 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Termination-64bit-Automizer_Default.epf [2018-11-23 01:52:26,725 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-23 01:52:26,726 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-23 01:52:26,727 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-23 01:52:26,727 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-23 01:52:26,727 INFO L133 SettingsManager]: * Use SBE=true [2018-11-23 01:52:26,728 INFO L131 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2018-11-23 01:52:26,728 INFO L133 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2018-11-23 01:52:26,728 INFO L133 SettingsManager]: * Use old map elimination=false [2018-11-23 01:52:26,728 INFO L133 SettingsManager]: * Use external solver (rank synthesis)=false [2018-11-23 01:52:26,728 INFO L133 SettingsManager]: * Use only trivial implications for array writes=true [2018-11-23 01:52:26,729 INFO L133 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2018-11-23 01:52:26,729 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-23 01:52:26,729 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-11-23 01:52:26,729 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-23 01:52:26,729 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-23 01:52:26,730 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2018-11-23 01:52:26,730 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2018-11-23 01:52:26,730 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2018-11-23 01:52:26,730 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-23 01:52:26,730 INFO L133 SettingsManager]: * Assume nondeterminstic values are in range=false [2018-11-23 01:52:26,730 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-23 01:52:26,731 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2018-11-23 01:52:26,731 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-23 01:52:26,731 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-23 01:52:26,731 INFO L133 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2018-11-23 01:52:26,731 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-23 01:52:26,732 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-23 01:52:26,732 INFO L133 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2018-11-23 01:52:26,733 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-11-23 01:52:26,733 INFO L133 SettingsManager]: * TransformationType=MODULO_NEIGHBOR [2018-11-23 01:52:26,777 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-23 01:52:26,791 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-23 01:52:26,795 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-23 01:52:26,796 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-23 01:52:26,797 INFO L276 PluginConnector]: CDTParser initialized [2018-11-23 01:52:26,798 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/termination-crafted-lit/cstrspn_true-termination_true-no-overflow.c [2018-11-23 01:52:26,862 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87ca0d672/98f5857002df4c7ca148f8c1bb6fe8a7/FLAG2ac2272c1 [2018-11-23 01:52:27,331 INFO L307 CDTParser]: Found 1 translation units. [2018-11-23 01:52:27,332 INFO L161 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/termination-crafted-lit/cstrspn_true-termination_true-no-overflow.c [2018-11-23 01:52:27,341 INFO L355 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87ca0d672/98f5857002df4c7ca148f8c1bb6fe8a7/FLAG2ac2272c1 [2018-11-23 01:52:27,664 INFO L363 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87ca0d672/98f5857002df4c7ca148f8c1bb6fe8a7 [2018-11-23 01:52:27,673 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-23 01:52:27,674 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-11-23 01:52:27,675 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-23 01:52:27,675 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-23 01:52:27,679 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-23 01:52:27,681 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:52:27" (1/1) ... [2018-11-23 01:52:27,683 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@245b4f6b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:27, skipping insertion in model container [2018-11-23 01:52:27,684 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:52:27" (1/1) ... [2018-11-23 01:52:27,693 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-23 01:52:27,713 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-23 01:52:27,930 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 01:52:27,951 INFO L191 MainTranslator]: Completed pre-run [2018-11-23 01:52:27,987 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 01:52:28,010 INFO L195 MainTranslator]: Completed translation [2018-11-23 01:52:28,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28 WrapperNode [2018-11-23 01:52:28,011 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-23 01:52:28,013 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-23 01:52:28,013 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-23 01:52:28,013 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-23 01:52:28,023 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,035 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,095 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-23 01:52:28,096 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-23 01:52:28,096 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-23 01:52:28,096 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-23 01:52:28,108 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,109 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,118 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,119 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,144 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,153 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,156 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (1/1) ... [2018-11-23 01:52:28,159 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-23 01:52:28,159 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-23 01:52:28,160 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-23 01:52:28,160 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-23 01:52:28,161 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:52:28" (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:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2018-11-23 01:52:28,296 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-23 01:52:28,297 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-23 01:52:28,297 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-23 01:52:28,297 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-23 01:52:28,297 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-23 01:52:28,396 FATAL L292 ToolchainWalker]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.AssertionError: If mcurrent is LocNode, then st is first statement of a block or fist statement after a call, fork, or join. at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$ProcedureCfgBuilder.buildProcedureCfgFromImplementation(CfgBuilder.java:657) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$ProcedureCfgBuilder.access$1(CfgBuilder.java:548) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:254) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:89) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2018-11-23 01:52:28,400 INFO L168 Benchmark]: Toolchain (without parser) took 726.93 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 722.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -755.1 MB). Peak memory consumption was 26.1 MB. Max. memory is 7.1 GB. [2018-11-23 01:52:28,403 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-23 01:52:28,403 INFO L168 Benchmark]: CACSL2BoogieTranslator took 337.26 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-23 01:52:28,404 INFO L168 Benchmark]: Boogie Procedure Inliner took 82.54 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-23 01:52:28,405 INFO L168 Benchmark]: Boogie Preprocessor took 63.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-23 01:52:28,406 INFO L168 Benchmark]: RCFGBuilder took 239.55 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 722.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -765.7 MB). Peak memory consumption was 15.5 MB. Max. memory is 7.1 GB. [2018-11-23 01:52:28,410 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - GenericResult: Assertions are enabled Assertions are enabled - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 337.26 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 82.54 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 63.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 239.55 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 722.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -765.7 MB). Peak memory consumption was 15.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: AssertionError: If mcurrent is LocNode, then st is first statement of a block or fist statement after a call, fork, or join. de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: AssertionError: If mcurrent is LocNode, then st is first statement of a block or fist statement after a call, fork, or join.: de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$ProcedureCfgBuilder.buildProcedureCfgFromImplementation(CfgBuilder.java:657) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...