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/ldv-regression/test26_false-unreach-call_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-aa41828 [2018-11-23 01:58:40,172 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-23 01:58:40,174 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-23 01:58:40,187 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-23 01:58:40,187 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-23 01:58:40,188 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-23 01:58:40,190 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-23 01:58:40,191 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-23 01:58:40,193 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-23 01:58:40,194 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-23 01:58:40,195 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-23 01:58:40,195 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-23 01:58:40,196 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-23 01:58:40,197 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-23 01:58:40,199 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-23 01:58:40,200 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-23 01:58:40,200 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-23 01:58:40,202 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-23 01:58:40,205 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-23 01:58:40,206 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-23 01:58:40,207 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-23 01:58:40,208 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-23 01:58:40,211 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-23 01:58:40,211 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-23 01:58:40,212 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-23 01:58:40,213 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-23 01:58:40,214 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-23 01:58:40,215 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-23 01:58:40,215 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-23 01:58:40,216 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-23 01:58:40,217 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-23 01:58:40,217 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-23 01:58:40,218 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-23 01:58:40,218 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-23 01:58:40,219 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-23 01:58:40,220 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-23 01:58:40,220 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 01:58:40,237 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-23 01:58:40,237 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-23 01:58:40,238 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-23 01:58:40,239 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-23 01:58:40,239 INFO L133 SettingsManager]: * Use SBE=true [2018-11-23 01:58:40,239 INFO L131 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2018-11-23 01:58:40,239 INFO L133 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2018-11-23 01:58:40,239 INFO L133 SettingsManager]: * Use old map elimination=false [2018-11-23 01:58:40,240 INFO L133 SettingsManager]: * Use external solver (rank synthesis)=false [2018-11-23 01:58:40,240 INFO L133 SettingsManager]: * Use only trivial implications for array writes=true [2018-11-23 01:58:40,240 INFO L133 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2018-11-23 01:58:40,240 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-23 01:58:40,241 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-11-23 01:58:40,241 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-23 01:58:40,241 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-23 01:58:40,241 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2018-11-23 01:58:40,241 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2018-11-23 01:58:40,242 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2018-11-23 01:58:40,242 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-23 01:58:40,242 INFO L133 SettingsManager]: * Assume nondeterminstic values are in range=false [2018-11-23 01:58:40,242 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-23 01:58:40,242 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2018-11-23 01:58:40,243 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-23 01:58:40,243 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-23 01:58:40,243 INFO L133 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2018-11-23 01:58:40,243 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-23 01:58:40,243 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-23 01:58:40,244 INFO L133 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2018-11-23 01:58:40,245 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-11-23 01:58:40,245 INFO L133 SettingsManager]: * TransformationType=MODULO_NEIGHBOR [2018-11-23 01:58:40,291 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-23 01:58:40,310 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-23 01:58:40,314 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-23 01:58:40,316 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-23 01:58:40,316 INFO L276 PluginConnector]: CDTParser initialized [2018-11-23 01:58:40,317 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test26_false-unreach-call_true-termination.c [2018-11-23 01:58:40,393 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94881086f/89ca146505464a7eb538d93ebea7a186/FLAG8f4049460 [2018-11-23 01:58:40,872 INFO L307 CDTParser]: Found 1 translation units. [2018-11-23 01:58:40,873 INFO L161 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test26_false-unreach-call_true-termination.c [2018-11-23 01:58:40,878 INFO L355 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94881086f/89ca146505464a7eb538d93ebea7a186/FLAG8f4049460 [2018-11-23 01:58:41,214 INFO L363 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94881086f/89ca146505464a7eb538d93ebea7a186 [2018-11-23 01:58:41,225 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-23 01:58:41,227 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-11-23 01:58:41,229 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-23 01:58:41,229 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-23 01:58:41,234 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-23 01:58:41,236 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,239 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64cbf194 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41, skipping insertion in model container [2018-11-23 01:58:41,239 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,251 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-23 01:58:41,274 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-23 01:58:41,474 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 01:58:41,490 INFO L191 MainTranslator]: Completed pre-run [2018-11-23 01:58:41,509 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 01:58:41,529 INFO L195 MainTranslator]: Completed translation [2018-11-23 01:58:41,530 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41 WrapperNode [2018-11-23 01:58:41,530 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-23 01:58:41,531 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-23 01:58:41,531 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-23 01:58:41,532 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-23 01:58:41,542 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,552 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,577 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-23 01:58:41,578 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-23 01:58:41,578 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-23 01:58:41,578 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-23 01:58:41,589 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,589 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,591 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,591 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,602 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,606 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,607 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (1/1) ... [2018-11-23 01:58:41,609 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-23 01:58:41,610 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-23 01:58:41,610 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-23 01:58:41,610 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-23 01:58:41,611 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:58:41" (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 01:58:41,737 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-23 01:58:41,737 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-23 01:58:41,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-23 01:58:41,737 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-23 01:58:41,738 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-23 01:58:41,738 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2018-11-23 01:58:41,819 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 01:58:41,825 INFO L168 Benchmark]: Toolchain (without parser) took 599.33 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 730.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -769.8 MB). Peak memory consumption was 25.6 MB. Max. memory is 7.1 GB. [2018-11-23 01:58:41,827 INFO L168 Benchmark]: CDTParser took 0.24 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 01:58:41,830 INFO L168 Benchmark]: CACSL2BoogieTranslator took 302.23 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 01:58:41,831 INFO L168 Benchmark]: Boogie Procedure Inliner took 46.07 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 01:58:41,832 INFO L168 Benchmark]: Boogie Preprocessor took 31.90 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 01:58:41,836 INFO L168 Benchmark]: RCFGBuilder took 212.12 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 730.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -780.4 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2018-11-23 01:58:41,844 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - GenericResult: Assertions are enabled Assertions are enabled - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 302.23 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 46.07 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 31.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 212.12 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 730.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -780.4 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: AssertionError: If mcurrent is LocNode, then st is first statement of a block or fist statement after a call, fork, or join. de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: AssertionError: If mcurrent is LocNode, then st is first statement of a block or fist statement after a call, fork, or join.: de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$ProcedureCfgBuilder.buildProcedureCfgFromImplementation(CfgBuilder.java:657) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...