/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 --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 12:12:42,900 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 12:12:42,904 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 12:12:42,936 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 12:12:42,936 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 12:12:42,946 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 12:12:42,948 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 12:12:42,952 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 12:12:42,956 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 12:12:42,957 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 12:12:42,958 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 12:12:42,961 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 12:12:42,962 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 12:12:42,967 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 12:12:42,968 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 12:12:42,972 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 12:12:42,973 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 12:12:42,977 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 12:12:42,980 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 12:12:42,986 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 12:12:42,990 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 12:12:42,991 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 12:12:42,992 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 12:12:42,995 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 12:12:43,000 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 12:12:43,001 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 12:12:43,001 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 12:12:43,004 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 12:12:43,005 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 12:12:43,006 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 12:12:43,006 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 12:12:43,007 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 12:12:43,008 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 12:12:43,009 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 12:12:43,011 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 12:12:43,011 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 12:12:43,012 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 12:12:43,012 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 12:12:43,012 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 12:12:43,014 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 12:12:43,015 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 12:12:43,016 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 12:12:43,071 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 12:12:43,072 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 12:12:43,074 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 12:12:43,074 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 12:12:43,075 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 12:12:43,075 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 12:12:43,075 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 12:12:43,076 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 12:12:43,076 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 12:12:43,076 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 12:12:43,077 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 12:12:43,077 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 12:12:43,078 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 12:12:43,078 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 12:12:43,078 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 12:12:43,079 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 12:12:43,079 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 12:12:43,079 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 12:12:43,079 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 12:12:43,079 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 12:12:43,080 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 12:12:43,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 12:12:43,080 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 12:12:43,080 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 12:12:43,081 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 12:12:43,081 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 12:12:43,081 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 12:12:43,081 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 12:12:43,081 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 12:12:43,082 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=SMALLESTAMONGWIDE;tolerance=0.3;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=SMALLESTAMONGWIDE;tolerance=0.3;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=SMALLESTAMONGWIDE;tolerance=0.3;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=SMALLESTAMONGWIDE;tolerance=0.3;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=SMALLESTAMONGWIDE;tolerance=0.3;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=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; [2020-09-25 12:12:43,561 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 12:12:43,584 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 12:12:43,589 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 12:12:43,591 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 12:12:43,591 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 12:12:43,592 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/float-newlib/double_req_bl_1012a.c [2020-09-25 12:12:43,691 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c613fa6ec/cd2cabddbbae49ca8a980160751d7963/FLAGdc47e2c8d [2020-09-25 12:12:44,281 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 12:12:44,282 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/float-newlib/double_req_bl_1012a.c [2020-09-25 12:12:44,290 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c613fa6ec/cd2cabddbbae49ca8a980160751d7963/FLAGdc47e2c8d [2020-09-25 12:12:44,607 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c613fa6ec/cd2cabddbbae49ca8a980160751d7963 [2020-09-25 12:12:44,620 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 12:12:44,625 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 12:12:44,626 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 12:12:44,626 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 12:12:44,630 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 12:12:44,631 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 12:12:44" (1/1) ... [2020-09-25 12:12:44,635 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b134fed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:44, skipping insertion in model container [2020-09-25 12:12:44,636 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 12:12:44" (1/1) ... [2020-09-25 12:12:44,643 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 12:12:44,670 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 12:12:44,962 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 12:12:44,970 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 12:12:45,005 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 12:12:45,031 INFO L208 MainTranslator]: Completed translation [2020-09-25 12:12:45,032 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45 WrapperNode [2020-09-25 12:12:45,032 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 12:12:45,033 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 12:12:45,033 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 12:12:45,033 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 12:12:45,139 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (1/1) ... [2020-09-25 12:12:45,139 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (1/1) ... [2020-09-25 12:12:45,151 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (1/1) ... [2020-09-25 12:12:45,151 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (1/1) ... [2020-09-25 12:12:45,164 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (1/1) ... [2020-09-25 12:12:45,171 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (1/1) ... [2020-09-25 12:12:45,173 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (1/1) ... [2020-09-25 12:12:45,177 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 12:12:45,177 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 12:12:45,177 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 12:12:45,177 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 12:12:45,179 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (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 12:12:45,256 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 12:12:45,256 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 12:12:45,256 INFO L138 BoogieDeclarations]: Found implementation of procedure isnan_double [2020-09-25 12:12:45,256 INFO L138 BoogieDeclarations]: Found implementation of procedure __signbit_double [2020-09-25 12:12:45,257 INFO L138 BoogieDeclarations]: Found implementation of procedure isinf_double [2020-09-25 12:12:45,257 INFO L138 BoogieDeclarations]: Found implementation of procedure fabs_double [2020-09-25 12:12:45,257 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 12:12:45,257 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 12:12:45,257 INFO L130 BoogieDeclarations]: Found specification of procedure isnan_double [2020-09-25 12:12:45,258 INFO L130 BoogieDeclarations]: Found specification of procedure __signbit_double [2020-09-25 12:12:45,258 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-25 12:12:45,258 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2020-09-25 12:12:45,258 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-25 12:12:45,258 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-25 12:12:45,258 INFO L130 BoogieDeclarations]: Found specification of procedure isinf_double [2020-09-25 12:12:45,259 INFO L130 BoogieDeclarations]: Found specification of procedure fabs_double [2020-09-25 12:12:45,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-25 12:12:45,259 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2020-09-25 12:12:45,259 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 12:12:45,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 12:12:45,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 12:12:45,723 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 12:12:45,723 INFO L295 CfgBuilder]: Removed 8 assume(true) statements. [2020-09-25 12:12:45,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 12:12:45 BoogieIcfgContainer [2020-09-25 12:12:45,729 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 12:12:45,730 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 12:12:45,731 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 12:12:45,735 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 12:12:45,735 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 12:12:44" (1/3) ... [2020-09-25 12:12:45,736 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51cbb7b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 12:12:45, skipping insertion in model container [2020-09-25 12:12:45,736 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:12:45" (2/3) ... [2020-09-25 12:12:45,737 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51cbb7b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 12:12:45, skipping insertion in model container [2020-09-25 12:12:45,737 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 12:12:45" (3/3) ... [2020-09-25 12:12:45,739 INFO L109 eAbstractionObserver]: Analyzing ICFG double_req_bl_1012a.c [2020-09-25 12:12:45,751 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 12:12:45,762 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-25 12:12:45,782 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-25 12:12:45,810 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 12:12:45,810 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 12:12:45,810 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 12:12:45,810 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 12:12:45,810 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 12:12:45,811 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 12:12:45,811 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 12:12:45,811 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 12:12:45,832 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states. [2020-09-25 12:12:45,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-25 12:12:45,840 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:12:45,842 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 12:12:45,842 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:12:45,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:12:45,850 INFO L82 PathProgramCache]: Analyzing trace with hash 1675366147, now seen corresponding path program 1 times [2020-09-25 12:12:45,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:12:45,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799361946] [2020-09-25 12:12:45,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:12:45,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:12:46,009 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:12:46,052 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:12:46,078 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:12:46,284 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:12:46,284 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-09-25 12:12:46,285 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-09-25 12:12:46,285 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 299 [2020-09-25 12:12:46,291 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:12:46,292 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:12:46,292 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:12:46,292 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-09-25 12:12:46,293 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:12:46,293 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 7 [2020-09-25 12:12:46,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:12:46,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:12:46,357 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:12:46,368 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:12:46,372 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:12:46,372 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:12:46,372 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-09-25 12:12:46,373 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:12:46,373 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:12:46,373 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:12:46,374 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:12:46,374 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:12:46,375 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-09-25 12:12:46,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-09-25 12:12:46,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:12:46,409 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:12:46,413 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:12:46,415 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:12:46,415 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 13 [2020-09-25 12:12:46,415 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-25 12:12:46,416 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-09-25 12:12:46,416 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:12:46,416 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:12:46,416 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:12:46,417 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 6 [2020-09-25 12:12:46,417 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:12:46,417 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:12:46,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2020-09-25 12:12:46,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:12:46,429 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:12:46,443 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:12:46,509 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:12:46,509 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 16 [2020-09-25 12:12:46,509 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-25 12:12:46,510 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 83 [2020-09-25 12:12:46,510 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:12:46,510 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:12:46,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:12:46,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-09-25 12:12:46,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:12:46,511 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:12:46,546 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 12:12:46,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799361946] [2020-09-25 12:12:46,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 12:12:46,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-25 12:12:46,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218518025] [2020-09-25 12:12:46,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-25 12:12:46,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:12:46,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-25 12:12:46,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-25 12:12:46,583 INFO L87 Difference]: Start difference. First operand 75 states. Second operand 4 states. [2020-09-25 12:12:46,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:12:46,907 INFO L93 Difference]: Finished difference Result 138 states and 151 transitions. [2020-09-25 12:12:46,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-25 12:12:46,910 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 33 [2020-09-25 12:12:46,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:12:46,928 INFO L225 Difference]: With dead ends: 138 [2020-09-25 12:12:46,929 INFO L226 Difference]: Without dead ends: 68 [2020-09-25 12:12:46,939 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 12:12:46,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-25 12:12:47,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-09-25 12:12:47,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-09-25 12:12:47,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 67 transitions. [2020-09-25 12:12:47,014 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 67 transitions. Word has length 33 [2020-09-25 12:12:47,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:12:47,015 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 67 transitions. [2020-09-25 12:12:47,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-25 12:12:47,015 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 67 transitions. [2020-09-25 12:12:47,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-09-25 12:12:47,017 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:12:47,018 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 12:12:47,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 12:12:47,018 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:12:47,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:12:47,019 INFO L82 PathProgramCache]: Analyzing trace with hash 1980992917, now seen corresponding path program 1 times [2020-09-25 12:12:47,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:12:47,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837253551] [2020-09-25 12:12:47,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:12:47,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-25 12:12:47,100 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-25 12:12:47,101 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-25 12:12:47,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 12:12:47,152 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 12:12:47 BoogieIcfgContainer [2020-09-25 12:12:47,152 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-25 12:12:47,160 INFO L168 Benchmark]: Toolchain (without parser) took 2532.43 ms. Allocated memory was 147.8 MB in the beginning and 235.4 MB in the end (delta: 87.6 MB). Free memory was 104.1 MB in the beginning and 194.2 MB in the end (delta: -90.1 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-25 12:12:47,164 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 147.8 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-25 12:12:47,165 INFO L168 Benchmark]: CACSL2BoogieTranslator took 406.64 ms. Allocated memory is still 147.8 MB. Free memory was 103.4 MB in the beginning and 92.6 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-09-25 12:12:47,166 INFO L168 Benchmark]: Boogie Preprocessor took 143.75 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 92.6 MB in the beginning and 181.7 MB in the end (delta: -89.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-09-25 12:12:47,170 INFO L168 Benchmark]: RCFGBuilder took 552.03 ms. Allocated memory is still 204.5 MB. Free memory was 181.7 MB in the beginning and 156.2 MB in the end (delta: 25.5 MB). Peak memory consumption was 25.5 MB. Max. memory is 7.1 GB. [2020-09-25 12:12:47,171 INFO L168 Benchmark]: TraceAbstraction took 1421.63 ms. Allocated memory was 204.5 MB in the beginning and 235.4 MB in the end (delta: 30.9 MB). Free memory was 155.5 MB in the beginning and 195.5 MB in the end (delta: -40.0 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-25 12:12:47,177 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 147.8 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 406.64 ms. Allocated memory is still 147.8 MB. Free memory was 103.4 MB in the beginning and 92.6 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 143.75 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 92.6 MB in the beginning and 181.7 MB in the end (delta: -89.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 552.03 ms. Allocated memory is still 204.5 MB. Free memory was 181.7 MB in the beginning and 156.2 MB in the end (delta: 25.5 MB). Peak memory consumption was 25.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1421.63 ms. Allocated memory was 204.5 MB in the beginning and 235.4 MB in the end (delta: 30.9 MB). Free memory was 155.5 MB in the beginning and 195.5 MB in the end (delta: -40.0 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: 1.3s, 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, 0.1s 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...