/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-SemanticLbe-McrStrategy.epf -i ../../../trunk/examples/svcomp/pthread-wmm/mix008_rmo.opt.i
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This is Ultimate 0.1.25-b981219
[2020-04-18 08:09:20,467 INFO L177 SettingsManager]: Resetting all preferences to default values...
[2020-04-18 08:09:20,469 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values
[2020-04-18 08:09:20,484 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-04-18 08:09:20,484 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-04-18 08:09:20,487 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-04-18 08:09:20,488 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-04-18 08:09:20,498 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values
[2020-04-18 08:09:20,501 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-04-18 08:09:20,502 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-04-18 08:09:20,503 INFO L181 SettingsManager]: Resetting Sifa preferences to default values
[2020-04-18 08:09:20,504 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-04-18 08:09:20,505 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-04-18 08:09:20,507 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-04-18 08:09:20,508 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-04-18 08:09:20,509 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-04-18 08:09:20,510 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-04-18 08:09:20,513 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-04-18 08:09:20,514 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-04-18 08:09:20,521 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values
[2020-04-18 08:09:20,524 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-04-18 08:09:20,528 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-04-18 08:09:20,529 INFO L181 SettingsManager]: Resetting Referee preferences to default values
[2020-04-18 08:09:20,531 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-04-18 08:09:20,533 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-04-18 08:09:20,534 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-04-18 08:09:20,534 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-04-18 08:09:20,537 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-04-18 08:09:20,538 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-04-18 08:09:20,539 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-04-18 08:09:20,539 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-04-18 08:09:20,540 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-04-18 08:09:20,541 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-04-18 08:09:20,542 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values
[2020-04-18 08:09:20,544 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-04-18 08:09:20,544 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values
[2020-04-18 08:09:20,545 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-04-18 08:09:20,545 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-04-18 08:09:20,545 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values
[2020-04-18 08:09:20,546 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values
[2020-04-18 08:09:20,547 INFO L188 SettingsManager]: Finished resetting all preferences to default values...
[2020-04-18 08:09:20,548 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-SemanticLbe-McrStrategy.epf
[2020-04-18 08:09:20,576 INFO L113 SettingsManager]: Loading preferences was successful
[2020-04-18 08:09:20,576 INFO L115 SettingsManager]: Preferences different from defaults after loading the file:
[2020-04-18 08:09:20,577 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-04-18 08:09:20,578 INFO L138 SettingsManager]: * Create parallel compositions if possible=false
[2020-04-18 08:09:20,578 INFO L138 SettingsManager]: * Use SBE=true
[2020-04-18 08:09:20,578 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-04-18 08:09:20,578 INFO L138 SettingsManager]: * sizeof long=4
[2020-04-18 08:09:20,578 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true
[2020-04-18 08:09:20,579 INFO L138 SettingsManager]: * sizeof POINTER=4
[2020-04-18 08:09:20,579 INFO L138 SettingsManager]: * Check division by zero=IGNORE
[2020-04-18 08:09:20,579 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE
[2020-04-18 08:09:20,579 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-04-18 08:09:20,579 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE
[2020-04-18 08:09:20,580 INFO L138 SettingsManager]: * sizeof long double=12
[2020-04-18 08:09:20,580 INFO L138 SettingsManager]: * Check if freed pointer was valid=false
[2020-04-18 08:09:20,580 INFO L138 SettingsManager]: * Use constant arrays=true
[2020-04-18 08:09:20,580 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE
[2020-04-18 08:09:20,580 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-04-18 08:09:20,581 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements
[2020-04-18 08:09:20,581 INFO L138 SettingsManager]: * To the following directory=./dump/
[2020-04-18 08:09:20,581 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode
[2020-04-18 08:09:20,581 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-04-18 08:09:20,581 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-04-18 08:09:20,582 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP
[2020-04-18 08:09:20,582 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-04-18 08:09:20,582 INFO L138 SettingsManager]: * Trace refinement strategy=MCR
[2020-04-18 08:09:20,582 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-04-18 08:09:20,583 INFO L138 SettingsManager]: * Trace refinement strategy used in MCR=CAMEL
[2020-04-18 08:09:20,583 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-04-18 08:09:20,583 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode
[2020-04-18 08:09:20,878 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp
[2020-04-18 08:09:20,892 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-04-18 08:09:20,895 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-04-18 08:09:20,896 INFO L271 PluginConnector]: Initializing CDTParser...
[2020-04-18 08:09:20,896 INFO L275 PluginConnector]: CDTParser initialized
[2020-04-18 08:09:20,897 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-wmm/mix008_rmo.opt.i
[2020-04-18 08:09:20,955 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/99bde6e72/4ee88a1727e4480380c5202bc5189cd1/FLAGf37d0a44b
[2020-04-18 08:09:21,467 INFO L306 CDTParser]: Found 1 translation units.
[2020-04-18 08:09:21,468 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-wmm/mix008_rmo.opt.i
[2020-04-18 08:09:21,485 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/99bde6e72/4ee88a1727e4480380c5202bc5189cd1/FLAGf37d0a44b
[2020-04-18 08:09:21,778 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/99bde6e72/4ee88a1727e4480380c5202bc5189cd1
[2020-04-18 08:09:21,786 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-04-18 08:09:21,809 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements.
[2020-04-18 08:09:21,810 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-04-18 08:09:21,810 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-04-18 08:09:21,814 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized
[2020-04-18 08:09:21,815 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.04 08:09:21" (1/1) ...
[2020-04-18 08:09:21,817 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38b96381 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:21, skipping insertion in model container
[2020-04-18 08:09:21,818 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.04 08:09:21" (1/1) ...
[2020-04-18 08:09:21,825 INFO L145 MainTranslator]: Starting translation in SV-COMP mode
[2020-04-18 08:09:21,891 INFO L178 MainTranslator]: Built tables and reachable declarations
[2020-04-18 08:09:22,477 INFO L206 PostProcessor]: Analyzing one entry point: main
[2020-04-18 08:09:22,489 INFO L203 MainTranslator]: Completed pre-run
[2020-04-18 08:09:22,567 INFO L206 PostProcessor]: Analyzing one entry point: main
[2020-04-18 08:09:22,649 INFO L208 MainTranslator]: Completed translation
[2020-04-18 08:09:22,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22 WrapperNode
[2020-04-18 08:09:22,650 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-04-18 08:09:22,651 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2020-04-18 08:09:22,651 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner...
[2020-04-18 08:09:22,651 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized
[2020-04-18 08:09:22,657 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,678 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,713 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2020-04-18 08:09:22,717 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-04-18 08:09:22,717 INFO L271 PluginConnector]: Initializing Boogie Preprocessor...
[2020-04-18 08:09:22,717 INFO L275 PluginConnector]: Boogie Preprocessor initialized
[2020-04-18 08:09:22,726 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,726 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,732 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,732 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,744 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,749 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,753 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (1/1) ...
[2020-04-18 08:09:22,759 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-04-18 08:09:22,760 INFO L113 PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-04-18 08:09:22,760 INFO L271 PluginConnector]: Initializing RCFGBuilder...
[2020-04-18 08:09:22,760 INFO L275 PluginConnector]: RCFGBuilder initialized
[2020-04-18 08:09:22,761 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 08:09:22" (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
[2020-04-18 08:09:22,832 INFO L130 BoogieDeclarations]: Found specification of procedure write~int
[2020-04-18 08:09:22,832 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin
[2020-04-18 08:09:22,833 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-04-18 08:09:22,833 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-04-18 08:09:22,833 INFO L130 BoogieDeclarations]: Found specification of procedure P0
[2020-04-18 08:09:22,833 INFO L138 BoogieDeclarations]: Found implementation of procedure P0
[2020-04-18 08:09:22,833 INFO L130 BoogieDeclarations]: Found specification of procedure P1
[2020-04-18 08:09:22,834 INFO L138 BoogieDeclarations]: Found implementation of procedure P1
[2020-04-18 08:09:22,834 INFO L130 BoogieDeclarations]: Found specification of procedure P2
[2020-04-18 08:09:22,834 INFO L138 BoogieDeclarations]: Found implementation of procedure P2
[2020-04-18 08:09:22,834 INFO L130 BoogieDeclarations]: Found specification of procedure P3
[2020-04-18 08:09:22,834 INFO L138 BoogieDeclarations]: Found implementation of procedure P3
[2020-04-18 08:09:22,835 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end
[2020-04-18 08:09:22,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-04-18 08:09:22,835 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-04-18 08:09:22,837 WARN L205 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement
Received shutdown request...
[2020-04-18 08:13:11,629 INFO L256 ToolchainWalker]: Toolchain cancelled while executing plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder. Reason: Timeout or Toolchain cancelled by user
[2020-04-18 08:13:11,633 INFO L168 Benchmark]: Toolchain (without parser) took 229844.38 ms. Allocated memory was 143.1 MB in the beginning and 4.1 GB in the end (delta: 4.0 GB). Free memory was 99.1 MB in the beginning and 1.6 GB in the end (delta: -1.5 GB). Peak memory consumption was 4.2 GB. Max. memory is 7.1 GB.
[2020-04-18 08:13:11,639 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 143.1 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB.
[2020-04-18 08:13:11,641 INFO L168 Benchmark]: CACSL2BoogieTranslator took 840.08 ms. Allocated memory was 143.1 MB in the beginning and 199.2 MB in the end (delta: 56.1 MB). Free memory was 97.1 MB in the beginning and 149.1 MB in the end (delta: -52.1 MB). Peak memory consumption was 20.7 MB. Max. memory is 7.1 GB.
[2020-04-18 08:13:11,642 INFO L168 Benchmark]: Boogie Procedure Inliner took 62.73 ms. Allocated memory is still 199.2 MB. Free memory was 149.1 MB in the beginning and 145.5 MB in the end (delta: 3.7 MB). Peak memory consumption was 3.7 MB. Max. memory is 7.1 GB.
[2020-04-18 08:13:11,643 INFO L168 Benchmark]: Boogie Preprocessor took 42.53 ms. Allocated memory is still 199.2 MB. Free memory was 145.5 MB in the beginning and 143.3 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB.
[2020-04-18 08:13:11,644 INFO L168 Benchmark]: RCFGBuilder took 228870.27 ms. Allocated memory was 199.2 MB in the beginning and 4.1 GB in the end (delta: 3.9 GB). Free memory was 143.3 MB in the beginning and 1.6 GB in the end (delta: -1.5 GB). Peak memory consumption was 4.2 GB. Max. memory is 7.1 GB.
[2020-04-18 08:13:11,653 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] #######################
--- Results ---
* Results from de.uni_freiburg.informatik.ultimate.core:
- StatisticsResult: Toolchain Benchmarks
Benchmark results are:
* CDTParser took 0.19 ms. Allocated memory is still 143.1 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB.
* CACSL2BoogieTranslator took 840.08 ms. Allocated memory was 143.1 MB in the beginning and 199.2 MB in the end (delta: 56.1 MB). Free memory was 97.1 MB in the beginning and 149.1 MB in the end (delta: -52.1 MB). Peak memory consumption was 20.7 MB. Max. memory is 7.1 GB.
* Boogie Procedure Inliner took 62.73 ms. Allocated memory is still 199.2 MB. Free memory was 149.1 MB in the beginning and 145.5 MB in the end (delta: 3.7 MB). Peak memory consumption was 3.7 MB. Max. memory is 7.1 GB.
* Boogie Preprocessor took 42.53 ms. Allocated memory is still 199.2 MB. Free memory was 145.5 MB in the beginning and 143.3 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB.
* RCFGBuilder took 228870.27 ms. Allocated memory was 199.2 MB in the beginning and 4.1 GB in the end (delta: 3.9 GB). Free memory was 143.3 MB in the beginning and 1.6 GB in the end (delta: -1.5 GB). Peak memory consumption was 4.2 GB. Max. memory is 7.1 GB.
* Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder:
- TimeoutResult: Timeout (de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder)
Toolchain cancelled while XnfDer was eliminating 1 quantified variables from 1 xjuncts.
RESULT: Ultimate could not prove your program: Timeout
Completed graceful shutdown