java -ea -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/C-BIN-BPP-RCFG.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Bitvector.epf -i ../../../trunk/examples/svcomp/seq-mthreaded/pals_lcr-var-start-time.6_false-unreach-call.2.ufo.BOUNDED-12.pals_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-0cd3be1 [2018-11-28 00:55:26,434 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-28 00:55:26,436 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-28 00:55:26,449 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-28 00:55:26,449 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-28 00:55:26,450 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-28 00:55:26,454 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-28 00:55:26,458 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-28 00:55:26,459 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-28 00:55:26,463 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-28 00:55:26,464 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-28 00:55:26,467 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-28 00:55:26,468 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-28 00:55:26,469 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-28 00:55:26,470 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-28 00:55:26,473 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-28 00:55:26,474 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-28 00:55:26,477 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-28 00:55:26,485 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-28 00:55:26,490 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-28 00:55:26,492 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-28 00:55:26,496 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-28 00:55:26,500 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-28 00:55:26,501 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-28 00:55:26,501 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-28 00:55:26,503 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-28 00:55:26,504 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-28 00:55:26,508 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-28 00:55:26,509 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-28 00:55:26,510 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-28 00:55:26,513 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-28 00:55:26,514 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-28 00:55:26,515 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-28 00:55:26,515 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-28 00:55:26,516 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-28 00:55:26,517 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-28 00:55:26,517 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Bitvector.epf [2018-11-28 00:55:26,543 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-28 00:55:26,543 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-28 00:55:26,544 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-28 00:55:26,544 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-28 00:55:26,545 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-28 00:55:26,546 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-28 00:55:26,546 INFO L133 SettingsManager]: * Use SBE=true [2018-11-28 00:55:26,546 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-28 00:55:26,546 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-28 00:55:26,547 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-28 00:55:26,547 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-28 00:55:26,547 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-28 00:55:26,547 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-28 00:55:26,547 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-28 00:55:26,549 INFO L133 SettingsManager]: * Use bitvectors instead of ints=true [2018-11-28 00:55:26,549 INFO L133 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2018-11-28 00:55:26,549 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-28 00:55:26,549 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-28 00:55:26,549 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-28 00:55:26,550 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-28 00:55:26,550 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-28 00:55:26,550 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-28 00:55:26,550 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-28 00:55:26,552 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-28 00:55:26,552 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-28 00:55:26,552 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-28 00:55:26,552 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-28 00:55:26,553 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-28 00:55:26,553 INFO L133 SettingsManager]: * Trace refinement strategy=WOLF [2018-11-28 00:55:26,553 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-28 00:55:26,553 INFO L133 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2018-11-28 00:55:26,553 INFO L133 SettingsManager]: * Logic for external solver=AUFBV [2018-11-28 00:55:26,554 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-28 00:55:26,618 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-28 00:55:26,633 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-28 00:55:26,642 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-28 00:55:26,644 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-28 00:55:26,644 INFO L276 PluginConnector]: CDTParser initialized [2018-11-28 00:55:26,645 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded/pals_lcr-var-start-time.6_false-unreach-call.2.ufo.BOUNDED-12.pals_true-termination.c [2018-11-28 00:55:26,712 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4fabf2142/d6533df407204d7ea6c369b9124f2a50/FLAGe8e9c89b7 [2018-11-28 00:55:27,266 INFO L307 CDTParser]: Found 1 translation units. [2018-11-28 00:55:27,267 INFO L161 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded/pals_lcr-var-start-time.6_false-unreach-call.2.ufo.BOUNDED-12.pals_true-termination.c [2018-11-28 00:55:27,283 INFO L355 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4fabf2142/d6533df407204d7ea6c369b9124f2a50/FLAGe8e9c89b7 [2018-11-28 00:55:27,547 INFO L363 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4fabf2142/d6533df407204d7ea6c369b9124f2a50 [2018-11-28 00:55:27,560 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-28 00:55:27,562 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-11-28 00:55:27,563 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-28 00:55:27,563 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-28 00:55:27,569 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-28 00:55:27,571 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 12:55:27" (1/1) ... [2018-11-28 00:55:27,574 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d02bd24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:27, skipping insertion in model container [2018-11-28 00:55:27,574 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 12:55:27" (1/1) ... [2018-11-28 00:55:27,582 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-28 00:55:27,648 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-28 00:55:28,054 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-11-28 00:55:28,073 INFO L191 MainTranslator]: Completed pre-run [2018-11-28 00:55:28,196 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-11-28 00:55:28,226 INFO L195 MainTranslator]: Completed translation [2018-11-28 00:55:28,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28 WrapperNode [2018-11-28 00:55:28,227 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-28 00:55:28,228 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-28 00:55:28,228 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-28 00:55:28,228 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-28 00:55:28,308 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,328 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,347 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-28 00:55:28,347 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-28 00:55:28,348 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-28 00:55:28,348 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-28 00:55:28,359 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,367 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,368 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,425 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,450 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,454 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (1/1) ... [2018-11-28 00:55:28,460 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-28 00:55:28,460 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-28 00:55:28,461 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-28 00:55:28,461 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-28 00:55:28,462 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:55:28" (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: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 [2018-11-28 00:55:28,528 INFO L130 BoogieDeclarations]: Found specification of procedure init [2018-11-28 00:55:28,528 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2018-11-28 00:55:28,528 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-28 00:55:28,528 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-28 00:55:28,528 INFO L130 BoogieDeclarations]: Found specification of procedure check [2018-11-28 00:55:28,528 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2018-11-28 00:55:28,530 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2018-11-28 00:55:28,530 INFO L138 BoogieDeclarations]: Found implementation of procedure node1 [2018-11-28 00:55:28,530 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2018-11-28 00:55:28,530 INFO L138 BoogieDeclarations]: Found implementation of procedure node4 [2018-11-28 00:55:28,530 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2018-11-28 00:55:28,530 INFO L138 BoogieDeclarations]: Found implementation of procedure node5 [2018-11-28 00:55:28,531 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2018-11-28 00:55:28,531 INFO L138 BoogieDeclarations]: Found implementation of procedure node2 [2018-11-28 00:55:28,532 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-28 00:55:28,532 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-28 00:55:28,532 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2018-11-28 00:55:28,532 INFO L138 BoogieDeclarations]: Found implementation of procedure node3 [2018-11-28 00:55:28,532 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2018-11-28 00:55:28,532 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2018-11-28 00:55:28,532 INFO L130 BoogieDeclarations]: Found specification of procedure node6 [2018-11-28 00:55:28,532 INFO L138 BoogieDeclarations]: Found implementation of procedure node6 [2018-11-28 00:55:28,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-28 00:55:28,533 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-28 00:55:31,344 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-28 00:55:31,345 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-11-28 00:55:31,345 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 12:55:31 BoogieIcfgContainer [2018-11-28 00:55:31,346 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-28 00:55:31,348 INFO L168 Benchmark]: Toolchain (without parser) took 3788.07 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -675.4 MB). Peak memory consumption was 50.7 MB. Max. memory is 7.1 GB. [2018-11-28 00:55:31,350 INFO L168 Benchmark]: CDTParser took 0.23 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. [2018-11-28 00:55:31,351 INFO L168 Benchmark]: CACSL2BoogieTranslator took 664.88 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: 21.1 MB). Peak memory consumption was 21.1 MB. Max. memory is 7.1 GB. [2018-11-28 00:55:31,352 INFO L168 Benchmark]: Boogie Procedure Inliner took 119.20 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -798.5 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2018-11-28 00:55:31,354 INFO L168 Benchmark]: Boogie Preprocessor took 112.65 ms. Allocated memory is still 2.3 GB. Free memory is still 2.2 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-28 00:55:31,354 INFO L168 Benchmark]: RCFGBuilder took 2885.64 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 101.9 MB). Peak memory consumption was 101.9 MB. Max. memory is 7.1 GB. [2018-11-28 00:55:31,359 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 0.23 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 664.88 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: 21.1 MB). Peak memory consumption was 21.1 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 119.20 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -798.5 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 112.65 ms. Allocated memory is still 2.3 GB. Free memory is still 2.2 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 2885.64 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 101.9 MB). Peak memory consumption was 101.9 MB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...