/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 --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/list-ext3-properties/sll_nondet_insert-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-89f541c [2020-08-28 00:57:07,461 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-28 00:57:07,465 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-28 00:57:07,493 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-28 00:57:07,493 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-28 00:57:07,494 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-28 00:57:07,496 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-28 00:57:07,498 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-28 00:57:07,500 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-28 00:57:07,502 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-28 00:57:07,503 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-28 00:57:07,505 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-28 00:57:07,505 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-28 00:57:07,506 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-28 00:57:07,508 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-28 00:57:07,509 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-28 00:57:07,510 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-28 00:57:07,512 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-28 00:57:07,514 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-28 00:57:07,516 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-28 00:57:07,518 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-28 00:57:07,519 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-28 00:57:07,521 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-28 00:57:07,522 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-28 00:57:07,525 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-28 00:57:07,525 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-28 00:57:07,525 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-28 00:57:07,526 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-28 00:57:07,527 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-28 00:57:07,528 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-28 00:57:07,529 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-28 00:57:07,530 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-28 00:57:07,531 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-28 00:57:07,532 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-28 00:57:07,534 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-28 00:57:07,534 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-28 00:57:07,535 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-28 00:57:07,535 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-28 00:57:07,535 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-28 00:57:07,537 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-28 00:57:07,538 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-28 00:57:07,539 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 [2020-08-28 00:57:07,574 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-28 00:57:07,574 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-28 00:57:07,576 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-28 00:57:07,576 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-28 00:57:07,576 INFO L138 SettingsManager]: * Use SBE=true [2020-08-28 00:57:07,576 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-28 00:57:07,576 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-28 00:57:07,577 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-28 00:57:07,577 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-28 00:57:07,577 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-28 00:57:07,577 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-28 00:57:07,577 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-28 00:57:07,578 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-28 00:57:07,578 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-28 00:57:07,578 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-28 00:57:07,578 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-28 00:57:07,578 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-28 00:57:07,579 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-28 00:57:07,579 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-28 00:57:07,579 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-28 00:57:07,579 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-28 00:57:07,580 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-28 00:57:07,580 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-28 00:57:07,580 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-28 00:57:07,580 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-28 00:57:07,580 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-28 00:57:07,581 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-28 00:57:07,581 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-28 00:57:07,581 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-28 00:57:07,581 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.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-28 00:57:08,057 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-28 00:57:08,074 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-28 00:57:08,078 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-28 00:57:08,080 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-28 00:57:08,080 INFO L275 PluginConnector]: CDTParser initialized [2020-08-28 00:57:08,082 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext3-properties/sll_nondet_insert-1.i [2020-08-28 00:57:08,147 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/824ac6b2a/d1922dc7ac134e719b86291870966196/FLAG3b7e039b8 [2020-08-28 00:57:08,807 INFO L306 CDTParser]: Found 1 translation units. [2020-08-28 00:57:08,808 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/list-ext3-properties/sll_nondet_insert-1.i [2020-08-28 00:57:08,823 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/824ac6b2a/d1922dc7ac134e719b86291870966196/FLAG3b7e039b8 [2020-08-28 00:57:09,018 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/824ac6b2a/d1922dc7ac134e719b86291870966196 [2020-08-28 00:57:09,033 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-28 00:57:09,035 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-28 00:57:09,036 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-28 00:57:09,036 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-28 00:57:09,040 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-28 00:57:09,041 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,046 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14fb4a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09, skipping insertion in model container [2020-08-28 00:57:09,046 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,056 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-28 00:57:09,102 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-28 00:57:09,615 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-28 00:57:09,626 INFO L203 MainTranslator]: Completed pre-run [2020-08-28 00:57:09,704 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-28 00:57:09,762 INFO L208 MainTranslator]: Completed translation [2020-08-28 00:57:09,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09 WrapperNode [2020-08-28 00:57:09,763 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-28 00:57:09,764 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-28 00:57:09,764 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-28 00:57:09,764 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-28 00:57:09,782 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,783 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,802 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,803 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,830 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,834 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (1/1) ... [2020-08-28 00:57:09,841 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-28 00:57:09,842 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-28 00:57:09,842 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-28 00:57:09,842 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-28 00:57:09,844 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (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 [2020-08-28 00:57:09,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-28 00:57:09,923 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-28 00:57:09,923 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-08-28 00:57:09,924 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-08-28 00:57:09,924 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-08-28 00:57:09,924 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2020-08-28 00:57:09,924 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_length [2020-08-28 00:57:09,925 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_destroy [2020-08-28 00:57:09,925 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_insert [2020-08-28 00:57:09,926 INFO L138 BoogieDeclarations]: Found implementation of procedure _get_nondet_int [2020-08-28 00:57:09,926 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-28 00:57:09,927 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-28 00:57:09,927 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-28 00:57:09,928 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-08-28 00:57:09,928 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-08-28 00:57:09,929 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-08-28 00:57:09,929 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-08-28 00:57:09,929 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-08-28 00:57:09,929 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-08-28 00:57:09,930 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-08-28 00:57:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-08-28 00:57:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-08-28 00:57:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-08-28 00:57:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-08-28 00:57:09,932 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-08-28 00:57:09,933 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-08-28 00:57:09,934 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-08-28 00:57:09,934 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-08-28 00:57:09,934 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-08-28 00:57:09,934 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-08-28 00:57:09,934 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-08-28 00:57:09,934 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-08-28 00:57:09,935 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-08-28 00:57:09,935 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-08-28 00:57:09,935 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-08-28 00:57:09,935 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-08-28 00:57:09,935 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-08-28 00:57:09,935 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-08-28 00:57:09,936 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-08-28 00:57:09,936 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-08-28 00:57:09,936 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-08-28 00:57:09,936 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-08-28 00:57:09,936 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-08-28 00:57:09,936 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-08-28 00:57:09,938 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-08-28 00:57:09,940 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-08-28 00:57:09,940 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-08-28 00:57:09,940 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-08-28 00:57:09,940 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-08-28 00:57:09,940 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-08-28 00:57:09,941 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-08-28 00:57:09,941 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-08-28 00:57:09,941 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-08-28 00:57:09,941 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-08-28 00:57:09,942 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-08-28 00:57:09,942 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-08-28 00:57:09,942 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-08-28 00:57:09,942 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-08-28 00:57:09,942 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-08-28 00:57:09,943 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-08-28 00:57:09,943 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-08-28 00:57:09,943 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-08-28 00:57:09,943 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-08-28 00:57:09,943 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-08-28 00:57:09,943 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-08-28 00:57:09,944 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-28 00:57:09,944 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-28 00:57:09,945 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-08-28 00:57:09,945 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-28 00:57:09,945 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-08-28 00:57:09,945 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-08-28 00:57:09,946 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-08-28 00:57:09,946 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-08-28 00:57:09,946 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-08-28 00:57:09,947 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-28 00:57:09,947 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-08-28 00:57:09,948 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-08-28 00:57:09,948 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-08-28 00:57:09,948 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-08-28 00:57:09,948 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-08-28 00:57:09,948 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-08-28 00:57:09,949 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-08-28 00:57:09,949 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-08-28 00:57:09,949 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-08-28 00:57:09,949 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-08-28 00:57:09,949 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-08-28 00:57:09,949 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-08-28 00:57:09,949 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-08-28 00:57:09,950 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-08-28 00:57:09,950 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-08-28 00:57:09,950 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-08-28 00:57:09,950 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-08-28 00:57:09,950 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-08-28 00:57:09,950 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-08-28 00:57:09,951 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-08-28 00:57:09,951 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-08-28 00:57:09,951 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-08-28 00:57:09,951 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-08-28 00:57:09,951 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-08-28 00:57:09,951 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-08-28 00:57:09,951 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-08-28 00:57:09,952 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-08-28 00:57:09,952 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-08-28 00:57:09,952 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-08-28 00:57:09,952 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-08-28 00:57:09,952 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-08-28 00:57:09,952 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-08-28 00:57:09,952 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-08-28 00:57:09,953 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-08-28 00:57:09,953 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-08-28 00:57:09,953 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-08-28 00:57:09,953 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-08-28 00:57:09,953 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-08-28 00:57:09,953 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-08-28 00:57:09,954 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-08-28 00:57:09,954 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-08-28 00:57:09,954 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-08-28 00:57:09,955 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-08-28 00:57:09,955 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-08-28 00:57:09,955 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2020-08-28 00:57:09,956 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-28 00:57:09,956 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-28 00:57:09,956 INFO L130 BoogieDeclarations]: Found specification of procedure sll_length [2020-08-28 00:57:09,956 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-28 00:57:09,956 INFO L130 BoogieDeclarations]: Found specification of procedure sll_destroy [2020-08-28 00:57:09,956 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-28 00:57:09,957 INFO L130 BoogieDeclarations]: Found specification of procedure sll_insert [2020-08-28 00:57:09,957 INFO L130 BoogieDeclarations]: Found specification of procedure _get_nondet_int [2020-08-28 00:57:09,957 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-28 00:57:09,957 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-28 00:57:09,959 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2020-08-28 00:57:09,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-28 00:57:09,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-28 00:57:10,296 INFO L732 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-08-28 00:57:10,629 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-28 00:57:10,629 INFO L295 CfgBuilder]: Removed 6 assume(true) statements. [2020-08-28 00:57:10,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.08 12:57:10 BoogieIcfgContainer [2020-08-28 00:57:10,635 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-28 00:57:10,636 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-28 00:57:10,636 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-28 00:57:10,640 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-28 00:57:10,640 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.08 12:57:09" (1/3) ... [2020-08-28 00:57:10,641 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@465d29e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.08 12:57:10, skipping insertion in model container [2020-08-28 00:57:10,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.08 12:57:09" (2/3) ... [2020-08-28 00:57:10,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@465d29e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.08 12:57:10, skipping insertion in model container [2020-08-28 00:57:10,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.08 12:57:10" (3/3) ... [2020-08-28 00:57:10,644 INFO L109 eAbstractionObserver]: Analyzing ICFG sll_nondet_insert-1.i [2020-08-28 00:57:10,657 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-28 00:57:10,668 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-28 00:57:10,689 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-28 00:57:10,716 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-28 00:57:10,716 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-28 00:57:10,716 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-28 00:57:10,716 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-28 00:57:10,716 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-28 00:57:10,717 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-28 00:57:10,717 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-28 00:57:10,717 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-28 00:57:10,742 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states. [2020-08-28 00:57:10,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-28 00:57:10,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-28 00:57:10,753 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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] [2020-08-28 00:57:10,754 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-28 00:57:10,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-28 00:57:10,762 INFO L82 PathProgramCache]: Analyzing trace with hash 960784814, now seen corresponding path program 1 times [2020-08-28 00:57:10,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-28 00:57:10,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649615737] [2020-08-28 00:57:10,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-28 00:57:10,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-28 00:57:10,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-28 00:57:10,916 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: Proof production must be enabled (you can do this via setOption). at de.uni_freiburg.informatik.ultimate.smtinterpol.muses.MusEnumerationScript.getInterpolants(MusEnumerationScript.java:211) at de.uni_freiburg.informatik.ultimate.smtinterpol.muses.MusEnumerationScript.getInterpolants(MusEnumerationScript.java:170) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.getInterpolants(WrapperScript.java:337) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.getInterpolants(WrapperScript.java:337) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.getInterpolants(ManagedScript.java:191) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.NestedInterpolantsBuilder.computeCraigInterpolants(NestedInterpolantsBuilder.java:285) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.NestedInterpolantsBuilder.(NestedInterpolantsBuilder.java:166) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.InterpolatingTraceCheckCraig.computeInterpolantsRecursive(InterpolatingTraceCheckCraig.java:326) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.InterpolatingTraceCheckCraig.computeInterpolants(InterpolatingTraceCheckCraig.java:228) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.InterpolatingTraceCheckCraig.(InterpolatingTraceCheckCraig.java:97) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModulePreferences.construct(IpTcStrategyModulePreferences.java:106) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.isCorrect(IpTcStrategyModuleBase.java:57) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.checkFeasibility(AutomatonFreeRefinementEngine.java:242) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:166) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:75) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:508) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:436) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:370) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:334) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:317) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2020-08-28 00:57:10,924 INFO L168 Benchmark]: Toolchain (without parser) took 1887.70 ms. Allocated memory was 140.0 MB in the beginning and 205.5 MB in the end (delta: 65.5 MB). Free memory was 102.3 MB in the beginning and 103.9 MB in the end (delta: -1.6 MB). Peak memory consumption was 64.0 MB. Max. memory is 7.1 GB. [2020-08-28 00:57:10,925 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-28 00:57:10,926 INFO L168 Benchmark]: CACSL2BoogieTranslator took 727.67 ms. Allocated memory was 140.0 MB in the beginning and 205.5 MB in the end (delta: 65.5 MB). Free memory was 102.1 MB in the beginning and 170.7 MB in the end (delta: -68.6 MB). Peak memory consumption was 25.3 MB. Max. memory is 7.1 GB. [2020-08-28 00:57:10,927 INFO L168 Benchmark]: Boogie Preprocessor took 77.75 ms. Allocated memory is still 205.5 MB. Free memory was 170.7 MB in the beginning and 168.0 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. [2020-08-28 00:57:10,928 INFO L168 Benchmark]: RCFGBuilder took 793.03 ms. Allocated memory is still 205.5 MB. Free memory was 168.0 MB in the beginning and 116.5 MB in the end (delta: 51.5 MB). Peak memory consumption was 51.5 MB. Max. memory is 7.1 GB. [2020-08-28 00:57:10,929 INFO L168 Benchmark]: TraceAbstraction took 283.73 ms. Allocated memory is still 205.5 MB. Free memory was 116.5 MB in the beginning and 103.9 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-08-28 00:57:10,933 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 727.67 ms. Allocated memory was 140.0 MB in the beginning and 205.5 MB in the end (delta: 65.5 MB). Free memory was 102.1 MB in the beginning and 170.7 MB in the end (delta: -68.6 MB). Peak memory consumption was 25.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 77.75 ms. Allocated memory is still 205.5 MB. Free memory was 170.7 MB in the beginning and 168.0 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 793.03 ms. Allocated memory is still 205.5 MB. Free memory was 168.0 MB in the beginning and 116.5 MB in the end (delta: 51.5 MB). Peak memory consumption was 51.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 283.73 ms. Allocated memory is still 205.5 MB. Free memory was 116.5 MB in the beginning and 103.9 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: Proof production must be enabled (you can do this via setOption). de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: Proof production must be enabled (you can do this via setOption).: de.uni_freiburg.informatik.ultimate.smtinterpol.muses.MusEnumerationScript.getInterpolants(MusEnumerationScript.java:211) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...