./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-crafted-lit/LeikeHeizmann-TACAS2014-Ex1_true-termination_true-no-overflow.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/config/KojakReach.xml -i ../../sv-benchmarks/c/termination-crafted-lit/LeikeHeizmann-TACAS2014-Ex1_true-termination_true-no-overflow.c -s /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/config/svcomp-Overflow-64bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash ebb74e337af9534aacfcb2a7a413bdbed21e04b2 ......................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-09 01:19:08,882 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 01:19:08,883 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 01:19:08,889 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 01:19:08,889 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 01:19:08,890 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 01:19:08,891 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 01:19:08,892 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 01:19:08,894 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 01:19:08,894 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 01:19:08,895 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 01:19:08,895 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 01:19:08,896 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 01:19:08,897 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 01:19:08,897 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 01:19:08,898 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 01:19:08,899 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 01:19:08,900 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 01:19:08,902 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 01:19:08,903 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 01:19:08,903 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 01:19:08,904 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 01:19:08,906 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 01:19:08,906 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 01:19:08,906 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 01:19:08,907 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 01:19:08,908 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 01:19:08,908 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 01:19:08,909 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 01:19:08,910 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 01:19:08,910 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 01:19:08,910 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 01:19:08,910 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 01:19:08,911 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 01:19:08,911 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 01:19:08,912 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 01:19:08,912 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/config/svcomp-Overflow-64bit-Kojak_Default.epf [2018-12-09 01:19:08,922 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 01:19:08,923 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 01:19:08,923 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 01:19:08,924 INFO L133 SettingsManager]: * ... to procedures called more than once=ALWAYS [2018-12-09 01:19:08,924 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-09 01:19:08,924 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-09 01:19:08,924 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 01:19:08,925 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-12-09 01:19:08,925 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 01:19:08,925 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 01:19:08,925 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 01:19:08,925 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 01:19:08,925 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 01:19:08,925 INFO L133 SettingsManager]: * Check absence of signed integer overflows=true [2018-12-09 01:19:08,926 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 01:19:08,926 INFO L133 SettingsManager]: * Use constant arrays=true [2018-12-09 01:19:08,926 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 01:19:08,926 INFO L131 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2018-12-09 01:19:08,926 INFO L133 SettingsManager]: * Timeout in seconds=1000000 [2018-12-09 01:19:08,926 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 01:19:08,927 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 01:19:08,927 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2018-12-09 01:19:08,927 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 01:19:08,927 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 01:19:08,927 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 01:19:08,927 INFO L133 SettingsManager]: * Trace refinement strategy=PENGUIN [2018-12-09 01:19:08,927 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 01:19:08,927 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 01:19:08,927 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ebb74e337af9534aacfcb2a7a413bdbed21e04b2 [2018-12-09 01:19:08,945 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 01:19:08,953 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 01:19:08,954 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 01:19:08,955 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 01:19:08,955 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 01:19:08,956 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/../../sv-benchmarks/c/termination-crafted-lit/LeikeHeizmann-TACAS2014-Ex1_true-termination_true-no-overflow.c [2018-12-09 01:19:09,000 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/data/37f71b1e4/aa945a9e797c48be9c7158b016c8d025/FLAG7505e9a8b [2018-12-09 01:19:09,434 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 01:19:09,435 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/sv-benchmarks/c/termination-crafted-lit/LeikeHeizmann-TACAS2014-Ex1_true-termination_true-no-overflow.c [2018-12-09 01:19:09,438 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/data/37f71b1e4/aa945a9e797c48be9c7158b016c8d025/FLAG7505e9a8b [2018-12-09 01:19:09,446 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/data/37f71b1e4/aa945a9e797c48be9c7158b016c8d025 [2018-12-09 01:19:09,448 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 01:19:09,448 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 01:19:09,449 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 01:19:09,449 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 01:19:09,451 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 01:19:09,451 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,453 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fd2551a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09, skipping insertion in model container [2018-12-09 01:19:09,453 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,457 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 01:19:09,465 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 01:19:09,544 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 01:19:09,546 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 01:19:09,555 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 01:19:09,562 INFO L195 MainTranslator]: Completed translation [2018-12-09 01:19:09,563 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09 WrapperNode [2018-12-09 01:19:09,563 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 01:19:09,563 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 01:19:09,563 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 01:19:09,563 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 01:19:09,568 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,571 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,581 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 01:19:09,581 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 01:19:09,582 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 01:19:09,582 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 01:19:09,587 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,587 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,588 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,588 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,589 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,622 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,622 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,623 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 01:19:09,623 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 01:19:09,623 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 01:19:09,623 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 01:19:09,624 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:19:09" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (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:10000 [2018-12-09 01:19:09,656 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 01:19:09,656 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 01:19:09,752 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 01:19:09,753 INFO L280 CfgBuilder]: Removed 5 assue(true) statements. [2018-12-09 01:19:09,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 01:19:09 BoogieIcfgContainer [2018-12-09 01:19:09,753 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 01:19:09,753 INFO L113 PluginConnector]: ------------------------CodeCheck---------------------------- [2018-12-09 01:19:09,753 INFO L271 PluginConnector]: Initializing CodeCheck... [2018-12-09 01:19:09,760 INFO L276 PluginConnector]: CodeCheck initialized [2018-12-09 01:19:09,760 INFO L185 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 01:19:09" (1/1) ... [2018-12-09 01:19:09,767 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:19:09,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:09,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 20 states and 21 transitions. [2018-12-09 01:19:09,790 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-12-09 01:19:09,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-09 01:19:09,791 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:09,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:09,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:09,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:09,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 23 states and 27 transitions. [2018-12-09 01:19:09,921 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2018-12-09 01:19:09,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-09 01:19:09,922 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:09,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:09,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:09,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:09,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 24 states and 29 transitions. [2018-12-09 01:19:09,964 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2018-12-09 01:19:09,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-09 01:19:09,965 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:09,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:09,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:10,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:10,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 28 states and 39 transitions. [2018-12-09 01:19:10,133 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2018-12-09 01:19:10,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-09 01:19:10,133 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:10,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:10,163 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:10,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:10,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 32 states and 49 transitions. [2018-12-09 01:19:10,338 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 49 transitions. [2018-12-09 01:19:10,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-09 01:19:10,338 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:10,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:10,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:10,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:10,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 31 states and 48 transitions. [2018-12-09 01:19:10,361 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 48 transitions. [2018-12-09 01:19:10,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-09 01:19:10,364 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:10,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:10,389 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:10,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:10,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 30 states and 47 transitions. [2018-12-09 01:19:10,438 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 47 transitions. [2018-12-09 01:19:10,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-09 01:19:10,439 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:10,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:10,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:10,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:10,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 32 states and 48 transitions. [2018-12-09 01:19:10,461 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 48 transitions. [2018-12-09 01:19:10,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-09 01:19:10,462 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:10,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:10,469 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:10,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:10,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 34 states and 52 transitions. [2018-12-09 01:19:10,483 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 52 transitions. [2018-12-09 01:19:10,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-09 01:19:10,484 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:10,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:10,552 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:10,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:10,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 36 states and 55 transitions. [2018-12-09 01:19:10,919 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 55 transitions. [2018-12-09 01:19:10,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-09 01:19:10,920 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:10,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:10,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:11,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:11,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 41 states and 61 transitions. [2018-12-09 01:19:11,247 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 61 transitions. [2018-12-09 01:19:11,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-09 01:19:11,248 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:11,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:11,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:11,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:11,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 32 states and 47 transitions. [2018-12-09 01:19:11,501 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 47 transitions. [2018-12-09 01:19:11,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-09 01:19:11,501 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:11,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:11,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-09 01:19:11,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:11,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 37 states and 53 transitions. [2018-12-09 01:19:11,837 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 53 transitions. [2018-12-09 01:19:11,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-09 01:19:11,837 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:11,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:11,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:19:12,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:12,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 37 states and 51 transitions. [2018-12-09 01:19:12,073 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2018-12-09 01:19:12,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-09 01:19:12,073 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:12,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:12,080 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-09 01:19:12,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:12,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 39 states and 53 transitions. [2018-12-09 01:19:12,228 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 53 transitions. [2018-12-09 01:19:12,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-09 01:19:12,228 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:12,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:12,234 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-09 01:19:12,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:12,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 46 states and 61 transitions. [2018-12-09 01:19:12,848 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 61 transitions. [2018-12-09 01:19:12,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-09 01:19:12,848 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:12,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:12,856 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-12-09 01:19:12,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:12,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 47 states and 61 transitions. [2018-12-09 01:19:12,910 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 61 transitions. [2018-12-09 01:19:12,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-09 01:19:12,910 INFO L431 CodeCheckObserver]: Error Path is FOUND. [2018-12-09 01:19:12,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:19:12,917 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-12-09 01:19:12,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2018-12-09 01:19:12,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 16 states and 19 transitions. [2018-12-09 01:19:12,983 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2018-12-09 01:19:12,983 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-09 01:19:12,983 WARN L428 CodeCheckObserver]: This Program is SAFE, Check terminated with 18 iterations. [2018-12-09 01:19:12,989 INFO L779 CodeCheckObserver]: All specifications hold 8 specifications checked. All of them hold [2018-12-09 01:19:13,040 INFO L583 CodeCheckObserver]: Invariant with dag size 20 [2018-12-09 01:19:13,046 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck CFG 09.12 01:19:13 ImpRootNode [2018-12-09 01:19:13,046 INFO L132 PluginConnector]: ------------------------ END CodeCheck---------------------------- [2018-12-09 01:19:13,046 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 01:19:13,047 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 01:19:13,047 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 01:19:13,047 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 01:19:09" (3/4) ... [2018-12-09 01:19:13,049 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-09 01:19:13,055 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2018-12-09 01:19:13,055 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2018-12-09 01:19:13,055 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-09 01:19:13,086 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_3f7733b2-8528-4e37-ab04-6a58d7ae0d96/bin-2019/ukojak/witness.graphml [2018-12-09 01:19:13,086 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 01:19:13,087 INFO L168 Benchmark]: Toolchain (without parser) took 3638.92 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 310.4 MB). Free memory was 962.4 MB in the beginning and 1.2 GB in the end (delta: -206.9 MB). Peak memory consumption was 103.5 MB. Max. memory is 11.5 GB. [2018-12-09 01:19:13,088 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 982.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 01:19:13,088 INFO L168 Benchmark]: CACSL2BoogieTranslator took 114.18 ms. Allocated memory is still 1.0 GB. Free memory was 962.4 MB in the beginning and 950.6 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. [2018-12-09 01:19:13,088 INFO L168 Benchmark]: Boogie Procedure Inliner took 18.09 ms. Allocated memory is still 1.0 GB. Free memory is still 950.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 01:19:13,088 INFO L168 Benchmark]: Boogie Preprocessor took 41.48 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 128.5 MB). Free memory was 950.6 MB in the beginning and 1.1 GB in the end (delta: -172.8 MB). Peak memory consumption was 13.0 MB. Max. memory is 11.5 GB. [2018-12-09 01:19:13,089 INFO L168 Benchmark]: RCFGBuilder took 129.88 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 14.9 MB). Peak memory consumption was 14.9 MB. Max. memory is 11.5 GB. [2018-12-09 01:19:13,089 INFO L168 Benchmark]: CodeCheck took 3293.04 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 181.9 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -60.8 MB). Peak memory consumption was 121.1 MB. Max. memory is 11.5 GB. [2018-12-09 01:19:13,089 INFO L168 Benchmark]: Witness Printer took 39.96 ms. Allocated memory is still 1.3 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 01:19:13,090 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck: - StatisticsResult: Ultimate CodeCheck benchmark data CFG has 1 procedures, 23 locations, 8 error locations. SAFE Result, 3.2s OverallTime, 18 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 262144 SDtfs, 436208 SDslu, 0 SDs, 0 SdLazy, 2943152 SolverSat, 657120 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1502 GetRequests, 1285 SyntacticMatches, 71 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9714 ImplicationChecksByTransitivity, 2.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=-1occurred in iteration=-1, traceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 152 NumberOfCodeBlocks, 152 NumberOfCodeBlocksAsserted, 17 NumberOfCheckSat, 135 ConstructedInterpolants, 0 QuantifiedInterpolants, 5497 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 17 InterpolantComputations, 10 PerfectInterpolantSequences, 27/50 InterpolantCoveringCapability, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - PositiveResult [Line: 21]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 19]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 19]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 21]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 21]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 19]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 19]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - PositiveResult [Line: 21]: integer overflow can never occur For all program executions holds that integer overflow can never occur at this location - AllSpecificationsHoldResult: All specifications hold 8 specifications checked. All of them hold - InvariantResult [Line: 17]: Loop Invariant Derived loop invariant: (((q <= y + 2147483645 && y <= 2147483647) && 2147483647 < q) || ((0 <= y + 2147483648 && y <= 2147483647) && q <= 2147483647)) || ((q + y <= 2147483646 && 0 <= y + 2147483648) && 2147483647 < q) * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 982.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 114.18 ms. Allocated memory is still 1.0 GB. Free memory was 962.4 MB in the beginning and 950.6 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 18.09 ms. Allocated memory is still 1.0 GB. Free memory is still 950.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 41.48 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 128.5 MB). Free memory was 950.6 MB in the beginning and 1.1 GB in the end (delta: -172.8 MB). Peak memory consumption was 13.0 MB. Max. memory is 11.5 GB. * RCFGBuilder took 129.88 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 14.9 MB). Peak memory consumption was 14.9 MB. Max. memory is 11.5 GB. * CodeCheck took 3293.04 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 181.9 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -60.8 MB). Peak memory consumption was 121.1 MB. Max. memory is 11.5 GB. * Witness Printer took 39.96 ms. Allocated memory is still 1.3 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. RESULT: Ultimate proved your program to be correct! Received shutdown request...