java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AbstractInterpretationC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loops/trex02-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 13:47:21,734 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 13:47:21,736 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 13:47:21,750 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-20 13:47:21,750 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-20 13:47:21,752 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-20 13:47:21,753 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-20 13:47:21,757 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-20 13:47:21,760 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-20 13:47:21,762 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-20 13:47:21,764 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-20 13:47:21,766 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-20 13:47:21,767 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-20 13:47:21,775 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-20 13:47:21,776 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-20 13:47:21,777 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-20 13:47:21,778 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-20 13:47:21,779 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-20 13:47:21,785 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-20 13:47:21,787 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-20 13:47:21,791 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-20 13:47:21,792 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-20 13:47:21,795 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-20 13:47:21,796 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-20 13:47:21,798 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-20 13:47:21,798 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-20 13:47:21,798 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-20 13:47:21,799 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-20 13:47:21,800 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-20 13:47:21,800 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-20 13:47:21,801 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-20 13:47:21,801 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-20 13:47:21,802 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-20 13:47:21,803 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-20 13:47:21,804 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-20 13:47:21,804 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-20 13:47:21,805 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-20 13:47:21,805 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-20 13:47:21,805 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-20 13:47:21,806 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-20 13:47:21,807 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-20 13:47:21,808 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-20 13:47:21,822 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 13:47:21,823 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 13:47:21,823 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-20 13:47:21,823 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-20 13:47:21,824 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-20 13:47:21,824 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-20 13:47:21,824 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-20 13:47:21,825 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-20 13:47:21,825 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-20 13:47:21,825 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-20 13:47:21,826 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 13:47:21,826 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 13:47:21,826 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 13:47:21,826 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 13:47:21,826 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 13:47:21,827 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 13:47:21,827 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 13:47:21,827 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 13:47:21,827 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 13:47:21,827 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 13:47:21,828 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 13:47:21,828 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-20 13:47:21,828 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 13:47:21,828 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 13:47:21,829 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 13:47:21,829 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 13:47:21,829 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-20 13:47:21,829 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 13:47:21,829 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 13:47:21,830 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-20 13:47:21,864 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 13:47:21,876 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 13:47:21,880 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 13:47:21,881 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 13:47:21,881 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 13:47:21,882 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/trex02-2.c [2019-09-20 13:47:21,958 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1a89b142/ca3224e6cf0046aaae90bf62d500866e/FLAG33723aaf9 [2019-09-20 13:47:22,390 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 13:47:22,391 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/trex02-2.c [2019-09-20 13:47:22,396 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1a89b142/ca3224e6cf0046aaae90bf62d500866e/FLAG33723aaf9 [2019-09-20 13:47:22,773 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b1a89b142/ca3224e6cf0046aaae90bf62d500866e [2019-09-20 13:47:22,781 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 13:47:22,783 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 13:47:22,783 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 13:47:22,784 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 13:47:22,787 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 13:47:22,788 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:47:22" (1/1) ... [2019-09-20 13:47:22,791 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b75efe2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:22, skipping insertion in model container [2019-09-20 13:47:22,791 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:47:22" (1/1) ... [2019-09-20 13:47:22,799 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 13:47:22,816 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 13:47:23,021 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:47:23,025 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 13:47:23,037 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:47:23,049 INFO L192 MainTranslator]: Completed translation [2019-09-20 13:47:23,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23 WrapperNode [2019-09-20 13:47:23,050 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 13:47:23,050 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 13:47:23,051 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 13:47:23,051 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 13:47:23,142 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23" (1/1) ... [2019-09-20 13:47:23,142 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23" (1/1) ... [2019-09-20 13:47:23,148 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23" (1/1) ... [2019-09-20 13:47:23,148 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23" (1/1) ... [2019-09-20 13:47:23,152 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23" (1/1) ... [2019-09-20 13:47:23,157 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23" (1/1) ... [2019-09-20 13:47:23,158 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23" (1/1) ... [2019-09-20 13:47:23,159 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 13:47:23,160 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 13:47:23,160 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 13:47:23,160 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 13:47:23,161 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:47:23" (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 [2019-09-20 13:47:23,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 13:47:23,224 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 13:47:23,224 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-20 13:47:23,224 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2019-09-20 13:47:23,224 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 13:47:23,224 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 13:47:23,224 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 13:47:23,224 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2019-09-20 13:47:23,225 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-20 13:47:23,225 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2019-09-20 13:47:23,225 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 13:47:23,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 13:47:23,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 13:47:23,401 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 13:47:23,402 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-20 13:47:23,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:47:23 BoogieIcfgContainer [2019-09-20 13:47:23,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 13:47:23,404 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-09-20 13:47:23,405 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-09-20 13:47:23,405 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-09-20 13:47:23,406 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:47:23" (1/1) ... [2019-09-20 13:47:23,437 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:47:23,607 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-20 13:47:23,659 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:47:23,679 INFO L272 AbstractInterpreter]: Visited 28 different actions 30 times. Never merged. Never widened. Performed 24 root evaluator evaluations with a maximum evaluation depth of 6. Performed 24 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 2 fixpoints after 2 different actions. Largest state had 6 variables. [2019-09-20 13:47:23,679 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-09-20 13:47:23,682 INFO L168 Benchmark]: Toolchain (without parser) took 898.08 ms. Allocated memory was 131.6 MB in the beginning and 198.7 MB in the end (delta: 67.1 MB). Free memory was 88.2 MB in the beginning and 155.4 MB in the end (delta: -67.2 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-09-20 13:47:23,684 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 131.6 MB. Free memory was 105.9 MB in the beginning and 105.6 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-20 13:47:23,685 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.66 ms. Allocated memory is still 131.6 MB. Free memory was 87.9 MB in the beginning and 78.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2019-09-20 13:47:23,686 INFO L168 Benchmark]: Boogie Preprocessor took 109.03 ms. Allocated memory was 131.6 MB in the beginning and 198.7 MB in the end (delta: 67.1 MB). Free memory was 78.7 MB in the beginning and 175.6 MB in the end (delta: -96.9 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. [2019-09-20 13:47:23,689 INFO L168 Benchmark]: RCFGBuilder took 244.00 ms. Allocated memory is still 198.7 MB. Free memory was 175.6 MB in the beginning and 162.9 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2019-09-20 13:47:23,691 INFO L168 Benchmark]: Abstract Interpretation took 274.70 ms. Allocated memory is still 198.7 MB. Free memory was 162.9 MB in the beginning and 155.4 MB in the end (delta: 7.6 MB). Peak memory consumption was 7.6 MB. Max. memory is 7.1 GB. [2019-09-20 13:47:23,698 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 131.6 MB. Free memory was 105.9 MB in the beginning and 105.6 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 266.66 ms. Allocated memory is still 131.6 MB. Free memory was 87.9 MB in the beginning and 78.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.03 ms. Allocated memory was 131.6 MB in the beginning and 198.7 MB in the end (delta: 67.1 MB). Free memory was 78.7 MB in the beginning and 175.6 MB in the end (delta: -96.9 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 244.00 ms. Allocated memory is still 198.7 MB. Free memory was 175.6 MB in the beginning and 162.9 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 274.70 ms. Allocated memory is still 198.7 MB. Free memory was 162.9 MB in the beginning and 155.4 MB in the end (delta: 7.6 MB). Peak memory consumption was 7.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 5]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: abstract domain could reach this error location. Possible FailurePath: [L13] int x; [L20] x=__VERIFIER_nondet_int() [L21] COND FALSE !(x > 0) [L26] CALL __VERIFIER_assert(x==0) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...