/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/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/float-newlib/double_req_bl_1012a.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-25 08:51:19,042 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 08:51:19,045 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 08:51:19,073 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 08:51:19,073 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 08:51:19,074 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 08:51:19,076 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 08:51:19,078 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 08:51:19,080 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 08:51:19,081 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 08:51:19,082 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 08:51:19,083 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 08:51:19,083 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 08:51:19,085 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 08:51:19,086 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 08:51:19,087 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 08:51:19,088 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 08:51:19,089 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 08:51:19,091 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 08:51:19,093 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 08:51:19,094 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 08:51:19,096 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 08:51:19,097 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 08:51:19,098 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 08:51:19,100 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 08:51:19,101 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 08:51:19,101 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 08:51:19,102 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 08:51:19,102 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 08:51:19,103 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 08:51:19,104 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 08:51:19,104 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 08:51:19,105 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 08:51:19,106 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 08:51:19,107 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 08:51:19,108 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 08:51:19,108 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 08:51:19,109 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 08:51:19,109 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 08:51:19,110 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 08:51:19,111 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 08:51:19,112 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-25 08:51:19,138 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 08:51:19,139 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 08:51:19,140 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 08:51:19,140 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 08:51:19,140 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 08:51:19,141 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 08:51:19,141 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 08:51:19,141 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 08:51:19,141 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 08:51:19,141 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 08:51:19,142 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 08:51:19,142 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 08:51:19,142 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 08:51:19,142 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 08:51:19,142 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 08:51:19,143 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 08:51:19,143 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 08:51:19,143 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 08:51:19,143 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 08:51:19,143 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 08:51:19,144 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 08:51:19,144 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 08:51:19,144 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 08:51:19,144 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 08:51:19,145 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 08:51:19,145 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 08:51:19,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 08:51:19,145 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 08:51:19,145 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 08:51:19,146 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; [2020-09-25 08:51:19,638 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 08:51:19,655 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 08:51:19,660 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 08:51:19,662 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 08:51:19,662 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 08:51:19,663 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/float-newlib/double_req_bl_1012a.c [2020-09-25 08:51:19,741 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf1813fc3/93f9635dfbb14bc393405bbb0e463fb3/FLAG80e26451c [2020-09-25 08:51:20,270 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 08:51:20,271 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/float-newlib/double_req_bl_1012a.c [2020-09-25 08:51:20,280 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf1813fc3/93f9635dfbb14bc393405bbb0e463fb3/FLAG80e26451c [2020-09-25 08:51:20,598 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf1813fc3/93f9635dfbb14bc393405bbb0e463fb3 [2020-09-25 08:51:20,610 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 08:51:20,615 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 08:51:20,616 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 08:51:20,616 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 08:51:20,620 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 08:51:20,621 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 08:51:20" (1/1) ... [2020-09-25 08:51:20,625 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61ac3c2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:20, skipping insertion in model container [2020-09-25 08:51:20,626 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 08:51:20" (1/1) ... [2020-09-25 08:51:20,634 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 08:51:20,661 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 08:51:20,948 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 08:51:20,952 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 08:51:20,983 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 08:51:21,009 INFO L208 MainTranslator]: Completed translation [2020-09-25 08:51:21,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21 WrapperNode [2020-09-25 08:51:21,010 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 08:51:21,011 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 08:51:21,011 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 08:51:21,011 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 08:51:21,110 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (1/1) ... [2020-09-25 08:51:21,110 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (1/1) ... [2020-09-25 08:51:21,121 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (1/1) ... [2020-09-25 08:51:21,122 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (1/1) ... [2020-09-25 08:51:21,134 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (1/1) ... [2020-09-25 08:51:21,141 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (1/1) ... [2020-09-25 08:51:21,143 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (1/1) ... [2020-09-25 08:51:21,150 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 08:51:21,150 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 08:51:21,151 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 08:51:21,151 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 08:51:21,152 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-25 08:51:21,224 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 08:51:21,224 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 08:51:21,225 INFO L138 BoogieDeclarations]: Found implementation of procedure isnan_double [2020-09-25 08:51:21,225 INFO L138 BoogieDeclarations]: Found implementation of procedure __signbit_double [2020-09-25 08:51:21,225 INFO L138 BoogieDeclarations]: Found implementation of procedure isinf_double [2020-09-25 08:51:21,225 INFO L138 BoogieDeclarations]: Found implementation of procedure fabs_double [2020-09-25 08:51:21,225 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 08:51:21,225 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 08:51:21,226 INFO L130 BoogieDeclarations]: Found specification of procedure isnan_double [2020-09-25 08:51:21,226 INFO L130 BoogieDeclarations]: Found specification of procedure __signbit_double [2020-09-25 08:51:21,226 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-25 08:51:21,226 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2020-09-25 08:51:21,227 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-25 08:51:21,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-25 08:51:21,227 INFO L130 BoogieDeclarations]: Found specification of procedure isinf_double [2020-09-25 08:51:21,227 INFO L130 BoogieDeclarations]: Found specification of procedure fabs_double [2020-09-25 08:51:21,227 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-25 08:51:21,228 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2020-09-25 08:51:21,228 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 08:51:21,228 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 08:51:21,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 08:51:21,682 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 08:51:21,683 INFO L295 CfgBuilder]: Removed 8 assume(true) statements. [2020-09-25 08:51:21,689 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 08:51:21 BoogieIcfgContainer [2020-09-25 08:51:21,690 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 08:51:21,691 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 08:51:21,691 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 08:51:21,695 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 08:51:21,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 08:51:20" (1/3) ... [2020-09-25 08:51:21,696 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f4b075c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 08:51:21, skipping insertion in model container [2020-09-25 08:51:21,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 08:51:21" (2/3) ... [2020-09-25 08:51:21,697 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f4b075c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 08:51:21, skipping insertion in model container [2020-09-25 08:51:21,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 08:51:21" (3/3) ... [2020-09-25 08:51:21,699 INFO L109 eAbstractionObserver]: Analyzing ICFG double_req_bl_1012a.c [2020-09-25 08:51:21,711 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 08:51:21,720 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-25 08:51:21,742 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-25 08:51:21,769 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 08:51:21,769 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 08:51:21,769 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 08:51:21,770 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 08:51:21,770 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 08:51:21,770 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 08:51:21,770 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 08:51:21,770 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 08:51:21,790 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states. [2020-09-25 08:51:21,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-25 08:51:21,798 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 08:51:21,799 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 08:51:21,799 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 08:51:21,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 08:51:21,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1675366147, now seen corresponding path program 1 times [2020-09-25 08:51:21,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 08:51:21,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774682099] [2020-09-25 08:51:21,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 08:51:21,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 08:51:21,962 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:51:22,005 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:51:22,030 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:51:22,252 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 08:51:22,252 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-09-25 08:51:22,252 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-09-25 08:51:22,253 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 314 [2020-09-25 08:51:22,256 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 08:51:22,257 FATAL L256 erpolLogProxyWrapper]: Tolerance: 1.0 [2020-09-25 08:51:22,257 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 08:51:22,257 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-09-25 08:51:22,258 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 08:51:22,258 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-09-25 08:51:22,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 08:51:22,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 08:51:22,320 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:51:22,330 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 08:51:22,331 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 08:51:22,331 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 08:51:22,331 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 11 [2020-09-25 08:51:22,332 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 08:51:22,332 FATAL L256 erpolLogProxyWrapper]: Tolerance: 1.0 [2020-09-25 08:51:22,332 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 08:51:22,333 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 08:51:22,333 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 08:51:22,333 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 08:51:22,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-09-25 08:51:22,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 08:51:22,362 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:51:22,365 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:51:22,366 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 08:51:22,367 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 13 [2020-09-25 08:51:22,367 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-25 08:51:22,367 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-09-25 08:51:22,367 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 08:51:22,368 FATAL L256 erpolLogProxyWrapper]: Tolerance: 1.0 [2020-09-25 08:51:22,368 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 08:51:22,368 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 6 [2020-09-25 08:51:22,369 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 08:51:22,369 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 08:51:22,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2020-09-25 08:51:22,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 08:51:22,380 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:51:22,392 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 08:51:22,454 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 08:51:22,454 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 16 [2020-09-25 08:51:22,455 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-25 08:51:22,455 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 76 [2020-09-25 08:51:22,455 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-09-25 08:51:22,456 FATAL L256 erpolLogProxyWrapper]: Tolerance: 1.0 [2020-09-25 08:51:22,456 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 08:51:22,456 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-09-25 08:51:22,456 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 08:51:22,456 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 08:51:22,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 08:51:22,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774682099] [2020-09-25 08:51:22,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 08:51:22,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-25 08:51:22,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669683671] [2020-09-25 08:51:22,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-25 08:51:22,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 08:51:22,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-25 08:51:22,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 08:51:22,505 INFO L87 Difference]: Start difference. First operand 75 states. Second operand 4 states. [2020-09-25 08:51:22,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 08:51:22,767 INFO L93 Difference]: Finished difference Result 138 states and 151 transitions. [2020-09-25 08:51:22,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-25 08:51:22,769 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 33 [2020-09-25 08:51:22,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 08:51:22,781 INFO L225 Difference]: With dead ends: 138 [2020-09-25 08:51:22,781 INFO L226 Difference]: Without dead ends: 68 [2020-09-25 08:51:22,786 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-25 08:51:22,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-25 08:51:22,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-09-25 08:51:22,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-09-25 08:51:22,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 67 transitions. [2020-09-25 08:51:22,849 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 67 transitions. Word has length 33 [2020-09-25 08:51:22,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 08:51:22,850 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 67 transitions. [2020-09-25 08:51:22,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-25 08:51:22,850 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 67 transitions. [2020-09-25 08:51:22,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-09-25 08:51:22,853 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 08:51:22,853 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 08:51:22,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 08:51:22,854 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 08:51:22,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 08:51:22,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1980992917, now seen corresponding path program 1 times [2020-09-25 08:51:22,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 08:51:22,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888625057] [2020-09-25 08:51:22,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 08:51:22,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-25 08:51:22,933 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-25 08:51:22,933 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-25 08:51:22,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 08:51:22,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 08:51:22 BoogieIcfgContainer [2020-09-25 08:51:22,985 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-25 08:51:22,997 INFO L168 Benchmark]: Toolchain (without parser) took 2378.31 ms. Allocated memory was 140.5 MB in the beginning and 235.9 MB in the end (delta: 95.4 MB). Free memory was 103.7 MB in the beginning and 195.8 MB in the end (delta: -92.0 MB). Peak memory consumption was 3.4 MB. Max. memory is 7.1 GB. [2020-09-25 08:51:22,998 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-25 08:51:22,999 INFO L168 Benchmark]: CACSL2BoogieTranslator took 394.94 ms. Allocated memory is still 140.5 MB. Free memory was 103.1 MB in the beginning and 92.2 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-09-25 08:51:23,001 INFO L168 Benchmark]: Boogie Preprocessor took 139.10 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 92.2 MB in the beginning and 181.2 MB in the end (delta: -89.0 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-09-25 08:51:23,002 INFO L168 Benchmark]: RCFGBuilder took 539.49 ms. Allocated memory is still 203.9 MB. Free memory was 181.2 MB in the beginning and 155.2 MB in the end (delta: 26.0 MB). Peak memory consumption was 26.0 MB. Max. memory is 7.1 GB. [2020-09-25 08:51:23,003 INFO L168 Benchmark]: TraceAbstraction took 1296.81 ms. Allocated memory was 203.9 MB in the beginning and 235.9 MB in the end (delta: 32.0 MB). Free memory was 155.2 MB in the beginning and 195.8 MB in the end (delta: -40.5 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-25 08:51:23,007 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 394.94 ms. Allocated memory is still 140.5 MB. Free memory was 103.1 MB in the beginning and 92.2 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 139.10 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 92.2 MB in the beginning and 181.2 MB in the end (delta: -89.0 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 539.49 ms. Allocated memory is still 203.9 MB. Free memory was 181.2 MB in the beginning and 155.2 MB in the end (delta: 26.0 MB). Peak memory consumption was 26.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1296.81 ms. Allocated memory was 203.9 MB in the beginning and 235.9 MB in the end (delta: 32.0 MB). Free memory was 155.2 MB in the beginning and 195.8 MB in the end (delta: -40.5 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 73]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of bitwiseOr at line 41, overapproximation of someBinaryArithmeticDOUBLEoperation at line 68, overapproximation of bitwiseAnd at line 38. Possible FailurePath: [L68] double x = 1.0 / 0.0; [L69] CALL, EXPR fabs_double(x) [L45] __uint32_t high; [L47] ieee_double_shape_type gh_u; [L48] gh_u.value = (x) [L49] EXPR gh_u.parts.msw [L49] (high) = gh_u.parts.msw [L52] ieee_double_shape_type sh_u; [L53] sh_u.value = (x) [L54] sh_u.parts.msw = (high & 0x7fffffff) [L55] EXPR sh_u.value [L55] (x) = sh_u.value [L57] return x; [L69] RET, EXPR fabs_double(x) [L69] double res = fabs_double(x); [L72] CALL, EXPR isinf_double(res) [L31] __int32_t hx, lx; [L33] ieee_double_shape_type ew_u; [L34] ew_u.value = (x) [L35] EXPR ew_u.parts.msw [L35] (hx) = ew_u.parts.msw [L36] EXPR ew_u.parts.lsw [L36] (lx) = ew_u.parts.lsw [L38] hx &= 0x7fffffff [L39] hx |= (__uint32_t)(lx | (-lx)) >> 31 [L40] hx = 0x7ff00000 - hx [L41] return 1 - (int)((__uint32_t)(hx | (-hx)) >> 31); [L72] RET, EXPR isinf_double(res) [L72] COND TRUE !isinf_double(res) [L73] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 94 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.1s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 70 SDtfs, 13 SDslu, 45 SDs, 0 SdLazy, 83 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 100 NumberOfCodeBlocks, 100 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 32 ConstructedInterpolants, 0 QuantifiedInterpolants, 2080 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...