java -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 --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AbstractInterpretationCInline.xml -s ../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-ToothlessTaipan_CON-OldIcfg.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem15_label56_true-unreach-call.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-dace188-m [2018-09-15 02:18:01,668 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-15 02:18:01,670 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-15 02:18:01,684 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-15 02:18:01,684 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-15 02:18:01,685 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-15 02:18:01,686 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-15 02:18:01,688 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-15 02:18:01,690 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-15 02:18:01,691 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-15 02:18:01,692 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-15 02:18:01,692 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-15 02:18:01,693 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-15 02:18:01,695 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-15 02:18:01,696 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-15 02:18:01,697 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-15 02:18:01,698 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-15 02:18:01,704 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-15 02:18:01,708 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-15 02:18:01,709 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-15 02:18:01,710 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-15 02:18:01,712 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-15 02:18:01,716 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-15 02:18:01,727 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-15 02:18:01,727 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-15 02:18:01,730 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-15 02:18:01,730 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-15 02:18:01,732 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-ToothlessTaipan_CON-OldIcfg.epf [2018-09-15 02:18:01,760 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-15 02:18:01,762 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-15 02:18:01,763 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-15 02:18:01,763 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-15 02:18:01,763 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-15 02:18:01,763 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-15 02:18:01,764 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-15 02:18:01,764 INFO L133 SettingsManager]: * Octagon Domain=false [2018-09-15 02:18:01,764 INFO L133 SettingsManager]: * Abstract domain=CongruenceDomain [2018-09-15 02:18:01,764 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-15 02:18:01,764 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-15 02:18:01,765 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-15 02:18:01,766 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-15 02:18:01,766 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-15 02:18:01,766 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-15 02:18:01,767 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-15 02:18:01,767 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-15 02:18:01,767 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-15 02:18:01,767 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-15 02:18:01,767 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-15 02:18:01,768 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-15 02:18:01,768 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-15 02:18:01,768 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-15 02:18:01,769 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-15 02:18:01,770 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-15 02:18:01,770 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-15 02:18:01,770 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-15 02:18:01,770 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-15 02:18:01,770 INFO L133 SettingsManager]: * Trace refinement strategy=TOOTHLESS_TAIPAN [2018-09-15 02:18:01,771 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-15 02:18:01,771 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-15 02:18:01,771 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-15 02:18:01,771 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-15 02:18:01,771 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-15 02:18:01,842 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-15 02:18:01,862 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-15 02:18:01,868 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-15 02:18:01,870 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-15 02:18:01,870 INFO L276 PluginConnector]: CDTParser initialized [2018-09-15 02:18:01,872 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem15_label56_true-unreach-call.c [2018-09-15 02:18:02,258 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/700d8be44/af59109fdd9e4a2eb3c267fc085cbf6a/FLAG3f87f66c0 [2018-09-15 02:18:02,616 INFO L277 CDTParser]: Found 1 translation units. [2018-09-15 02:18:02,617 INFO L159 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem15_label56_true-unreach-call.c [2018-09-15 02:18:02,640 INFO L325 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/700d8be44/af59109fdd9e4a2eb3c267fc085cbf6a/FLAG3f87f66c0 [2018-09-15 02:18:02,661 INFO L333 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/700d8be44/af59109fdd9e4a2eb3c267fc085cbf6a [2018-09-15 02:18:02,673 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-15 02:18:02,676 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-15 02:18:02,677 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-15 02:18:02,677 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-15 02:18:02,684 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-15 02:18:02,685 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.09 02:18:02" (1/1) ... [2018-09-15 02:18:02,688 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43a96985 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:02, skipping insertion in model container [2018-09-15 02:18:02,688 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.09 02:18:02" (1/1) ... [2018-09-15 02:18:02,700 INFO L160 ieTranslatorObserver]: Starting translation in SV-COMP mode [2018-09-15 02:18:03,478 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-15 02:18:03,496 INFO L424 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-15 02:18:03,773 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-15 02:18:03,909 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03 WrapperNode [2018-09-15 02:18:03,909 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-15 02:18:03,910 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-15 02:18:03,910 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-15 02:18:03,910 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-15 02:18:03,920 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:03,981 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:04,160 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-15 02:18:04,161 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-15 02:18:04,161 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-15 02:18:04,161 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-15 02:18:04,585 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:04,586 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:04,605 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:04,605 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:04,705 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:04,741 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:04,788 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (1/1) ... [2018-09-15 02:18:04,831 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-15 02:18:04,832 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-15 02:18:04,832 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-15 02:18:04,832 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-15 02:18:04,835 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.09 02:18:03" (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 [2018-09-15 02:18:04,908 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-15 02:18:04,909 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-15 02:18:04,909 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2018-09-15 02:18:04,909 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2018-09-15 02:18:04,909 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2018-09-15 02:18:04,909 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2018-09-15 02:18:04,910 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-15 02:18:04,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-15 02:18:04,910 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-15 02:18:04,910 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-15 02:18:13,231 INFO L353 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-15 02:18:13,232 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.09 02:18:13 BoogieIcfgContainer [2018-09-15 02:18:13,232 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-15 02:18:13,233 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2018-09-15 02:18:13,233 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2018-09-15 02:18:13,234 INFO L276 PluginConnector]: Abstract Interpretation initialized [2018-09-15 02:18:13,235 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.09 02:18:13" (1/1) ... [2018-09-15 02:18:13,262 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CongruenceDomain (maxUnwinding=3, maxParallelStates=2) Received shutdown request... [2018-09-15 02:22:37,685 WARN L572 FixpointEngine]: Received timeout, aborting fixpoint engine [2018-09-15 02:22:37,687 INFO L256 ToolchainWalker]: Toolchain cancelled while executing plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2. Reason: Timeout or Toolchain cancelled by user [2018-09-15 02:22:37,691 INFO L168 Benchmark]: Toolchain (without parser) took 275017.98 ms. Allocated memory was 1.5 GB in the beginning and 4.2 GB in the end (delta: 2.6 GB). Free memory was 1.4 GB in the beginning and 3.5 GB in the end (delta: -2.1 GB). Peak memory consumption was 2.8 GB. Max. memory is 7.1 GB. [2018-09-15 02:22:37,694 INFO L168 Benchmark]: CDTParser took 0.21 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. [2018-09-15 02:22:37,694 INFO L168 Benchmark]: CACSL2BoogieTranslator took 1232.73 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.3 GB in the end (delta: 126.8 MB). Peak memory consumption was 126.8 MB. Max. memory is 7.1 GB. [2018-09-15 02:22:37,695 INFO L168 Benchmark]: Boogie Procedure Inliner took 250.24 ms. Allocated memory is still 1.5 GB. Free memory was 1.3 GB in the beginning and 1.3 GB in the end (delta: 42.3 MB). Peak memory consumption was 42.3 MB. Max. memory is 7.1 GB. [2018-09-15 02:22:37,696 INFO L168 Benchmark]: Boogie Preprocessor took 670.96 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 888.1 MB). Free memory was 1.3 GB in the beginning and 2.3 GB in the end (delta: -1.0 GB). Peak memory consumption was 89.6 MB. Max. memory is 7.1 GB. [2018-09-15 02:22:37,698 INFO L168 Benchmark]: RCFGBuilder took 8400.65 ms. Allocated memory is still 2.4 GB. Free memory was 2.3 GB in the beginning and 2.0 GB in the end (delta: 311.4 MB). Peak memory consumption was 311.4 MB. Max. memory is 7.1 GB. [2018-09-15 02:22:37,699 INFO L168 Benchmark]: Abstract Interpretation took 264457.17 ms. Allocated memory was 2.4 GB in the beginning and 4.2 GB in the end (delta: 1.7 GB). Free memory was 2.0 GB in the beginning and 3.5 GB in the end (delta: -1.5 GB). Peak memory consumption was 2.5 GB. Max. memory is 7.1 GB. [2018-09-15 02:22:37,705 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 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 1232.73 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.3 GB in the end (delta: 126.8 MB). Peak memory consumption was 126.8 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 250.24 ms. Allocated memory is still 1.5 GB. Free memory was 1.3 GB in the beginning and 1.3 GB in the end (delta: 42.3 MB). Peak memory consumption was 42.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 670.96 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 888.1 MB). Free memory was 1.3 GB in the beginning and 2.3 GB in the end (delta: -1.0 GB). Peak memory consumption was 89.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 8400.65 ms. Allocated memory is still 2.4 GB. Free memory was 2.3 GB in the beginning and 2.0 GB in the end (delta: 311.4 MB). Peak memory consumption was 311.4 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 264457.17 ms. Allocated memory was 2.4 GB in the beginning and 4.2 GB in the end (delta: 1.7 GB). Free memory was 2.0 GB in the beginning and 3.5 GB in the end (delta: -1.5 GB). Peak memory consumption was 2.5 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - TimeoutResult: Timeout (de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2) Toolchain cancelled while FixpointEngine was executing abstract interpretation. RESULT: Ultimate could not prove your program: Timeout Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/Problem15_label56_true-unreach-call.c_svcomp-Reach-64bit-ToothlessTaipan_CON-OldIcfg.epf_AbstractInterpretationCInline.xml/Csv-Benchmark-0-2018-09-15_02-22-37-722.csv Completed graceful shutdown