./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/ldv-memsafety/memsetNonZero2_-write.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/ldv-memsafety/memsetNonZero2_-write.c -s /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7785be5078a920429dc2d1af3a353f3d5cac6d6f ....................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-22 13:03:39,992 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:03:39,995 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:03:40,052 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:03:40,053 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:03:40,058 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:03:40,061 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:03:40,065 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:03:40,068 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:03:40,073 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:03:40,074 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:03:40,077 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:03:40,077 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:03:40,080 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:03:40,082 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:03:40,084 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:03:40,085 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:03:40,088 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:03:40,091 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:03:40,098 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:03:40,100 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:03:40,101 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:03:40,103 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:03:40,104 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:03:40,113 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:03:40,113 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:03:40,113 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:03:40,115 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:03:40,116 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:03:40,117 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:03:40,117 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:03:40,119 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:03:40,120 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:03:40,122 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:03:40,123 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:03:40,123 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:03:40,124 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:03:40,125 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:03:40,125 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:03:40,126 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:03:40,127 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:03:40,129 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-11-22 13:03:40,173 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:03:40,173 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:03:40,175 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:03:40,175 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:03:40,175 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:03:40,175 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:03:40,176 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:03:40,176 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:03:40,176 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:03:40,176 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:03:40,177 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:03:40,178 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:03:40,178 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:03:40,178 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:03:40,178 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:03:40,179 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-22 13:03:40,179 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-22 13:03:40,180 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:03:40,180 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:03:40,180 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-22 13:03:40,180 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:03:40,181 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:03:40,181 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:03:40,181 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-22 13:03:40,181 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-22 13:03:40,181 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-22 13:03:40,183 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:03:40,183 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:03:40,183 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:03:40,184 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:03:40,184 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:03:40,184 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:03:40,185 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:03:40,185 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:03:40,185 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:03:40,185 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:03:40,186 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:03:40,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:03:40,186 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:03:40,186 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:03:40,186 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7785be5078a920429dc2d1af3a353f3d5cac6d6f [2020-11-22 13:03:40,423 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:03:40,443 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:03:40,446 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:03:40,447 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:03:40,448 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:03:40,449 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/../../sv-benchmarks/c/ldv-memsafety/memsetNonZero2_-write.c [2020-11-22 13:03:40,517 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/data/3979ad542/9aa9a95ef1a24564b36d1936bc0afef9/FLAGad4c62ea8 [2020-11-22 13:03:41,004 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:03:41,005 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/sv-benchmarks/c/ldv-memsafety/memsetNonZero2_-write.c [2020-11-22 13:03:41,010 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/data/3979ad542/9aa9a95ef1a24564b36d1936bc0afef9/FLAGad4c62ea8 [2020-11-22 13:03:41,388 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/data/3979ad542/9aa9a95ef1a24564b36d1936bc0afef9 [2020-11-22 13:03:41,390 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:03:41,391 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:03:41,395 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:03:41,395 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:03:41,399 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:03:41,400 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,402 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60c5daa3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41, skipping insertion in model container [2020-11-22 13:03:41,403 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,410 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:03:41,421 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:03:41,580 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:03:41,609 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:03:41,622 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:03:41,634 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:03:41,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41 WrapperNode [2020-11-22 13:03:41,635 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:03:41,636 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:03:41,636 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:03:41,637 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:03:41,644 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,649 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,665 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:03:41,666 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:03:41,666 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:03:41,666 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:03:41,674 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,674 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,675 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,676 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,679 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,682 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,683 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... [2020-11-22 13:03:41,684 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:03:41,685 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:03:41,685 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:03:41,686 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:03:41,687 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/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 [2020-11-22 13:03:41,755 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:03:41,756 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:03:41,756 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:03:41,756 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-22 13:03:42,149 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:03:42,150 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-22 13:03:42,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:42 BoogieIcfgContainer [2020-11-22 13:03:42,151 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:03:42,153 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:03:42,153 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:03:42,157 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:03:42,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:03:41" (1/3) ... [2020-11-22 13:03:42,158 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412cda2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:03:42, skipping insertion in model container [2020-11-22 13:03:42,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:41" (2/3) ... [2020-11-22 13:03:42,159 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412cda2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:03:42, skipping insertion in model container [2020-11-22 13:03:42,159 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:42" (3/3) ... [2020-11-22 13:03:42,160 INFO L111 eAbstractionObserver]: Analyzing ICFG memsetNonZero2_-write.c [2020-11-22 13:03:42,171 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:03:42,175 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2020-11-22 13:03:42,186 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2020-11-22 13:03:42,215 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:03:42,215 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-22 13:03:42,215 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:03:42,215 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:03:42,216 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:03:42,216 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:03:42,216 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:03:42,216 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:03:42,230 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2020-11-22 13:03:42,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2020-11-22 13:03:42,238 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:42,239 INFO L422 BasicCegarLoop]: trace histogram [1, 1] [2020-11-22 13:03:42,240 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_DEREFERENCE]=== [2020-11-22 13:03:42,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:42,246 INFO L82 PathProgramCache]: Analyzing trace with hash 1553, now seen corresponding path program 1 times [2020-11-22 13:03:42,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:42,257 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58303613] [2020-11-22 13:03:42,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:42,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:42,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:42,427 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58303613] [2020-11-22 13:03:42,428 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:03:42,428 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-22 13:03:42,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155317508] [2020-11-22 13:03:42,432 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-22 13:03:42,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:42,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-22 13:03:42,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 13:03:42,457 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2020-11-22 13:03:42,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:42,493 INFO L93 Difference]: Finished difference Result 8 states and 8 transitions. [2020-11-22 13:03:42,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-22 13:03:42,495 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 2 [2020-11-22 13:03:42,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:42,502 INFO L225 Difference]: With dead ends: 8 [2020-11-22 13:03:42,502 INFO L226 Difference]: Without dead ends: 7 [2020-11-22 13:03:42,504 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-22 13:03:42,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2020-11-22 13:03:42,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2020-11-22 13:03:42,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-11-22 13:03:42,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2020-11-22 13:03:42,531 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 2 [2020-11-22 13:03:42,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:42,531 INFO L481 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2020-11-22 13:03:42,531 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-22 13:03:42,532 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2020-11-22 13:03:42,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-22 13:03:42,532 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:42,532 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-22 13:03:42,533 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:03:42,533 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_DEREFERENCE]=== [2020-11-22 13:03:42,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:42,534 INFO L82 PathProgramCache]: Analyzing trace with hash 48179, now seen corresponding path program 1 times [2020-11-22 13:03:42,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:42,534 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448515199] [2020-11-22 13:03:42,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:42,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:03:42,567 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:03:42,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:03:42,579 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:03:42,602 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 13:03:42,603 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 13:03:42,604 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 13:03:42,614 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,615 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,615 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,616 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,616 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,617 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,623 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:03:42 BoogieIcfgContainer [2020-11-22 13:03:42,624 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:03:42,624 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:03:42,625 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:03:42,625 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:03:42,626 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:42" (3/4) ... [2020-11-22 13:03:42,628 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 13:03:42,629 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,629 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,630 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,630 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,630 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,631 WARN L417 cessorBacktranslator]: Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled [2020-11-22 13:03:42,664 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_d76bc34e-1dc6-451a-b1f4-df10c7a0a9cc/bin/utaipan/witness.graphml [2020-11-22 13:03:42,664 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:03:42,666 INFO L168 Benchmark]: Toolchain (without parser) took 1273.72 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 58.1 MB in the beginning and 83.2 MB in the end (delta: -25.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:42,667 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 90.2 MB. Free memory was 47.4 MB in the beginning and 47.3 MB in the end (delta: 39.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:42,669 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.82 ms. Allocated memory is still 90.2 MB. Free memory was 57.9 MB in the beginning and 68.1 MB in the end (delta: -10.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:42,670 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.83 ms. Allocated memory is still 90.2 MB. Free memory was 68.1 MB in the beginning and 67.0 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:42,672 INFO L168 Benchmark]: Boogie Preprocessor took 18.84 ms. Allocated memory is still 90.2 MB. Free memory was 67.0 MB in the beginning and 66.0 MB in the end (delta: 968.8 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:42,678 INFO L168 Benchmark]: RCFGBuilder took 466.30 ms. Allocated memory is still 90.2 MB. Free memory was 66.0 MB in the beginning and 53.1 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:42,679 INFO L168 Benchmark]: TraceAbstraction took 470.83 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 52.7 MB in the beginning and 85.2 MB in the end (delta: -32.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:42,679 INFO L168 Benchmark]: Witness Printer took 39.75 ms. Allocated memory is still 109.1 MB. Free memory was 85.2 MB in the beginning and 83.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:42,688 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 90.2 MB. Free memory was 47.4 MB in the beginning and 47.3 MB in the end (delta: 39.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 240.82 ms. Allocated memory is still 90.2 MB. Free memory was 57.9 MB in the beginning and 68.1 MB in the end (delta: -10.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 28.83 ms. Allocated memory is still 90.2 MB. Free memory was 68.1 MB in the beginning and 67.0 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.84 ms. Allocated memory is still 90.2 MB. Free memory was 67.0 MB in the beginning and 66.0 MB in the end (delta: 968.8 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 466.30 ms. Allocated memory is still 90.2 MB. Free memory was 66.0 MB in the beginning and 53.1 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 470.83 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 52.7 MB in the beginning and 85.2 MB in the end (delta: -32.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 39.75 ms. Allocated memory is still 109.1 MB. Free memory was 85.2 MB in the beginning and 83.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: Nested struct field access of VarList #Ultimate.C_memset_#ptr : $Pointer$ not handled * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: -1]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L21] struct compstat cstats ; - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 9 locations, 3 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.3s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 4 SDtfs, 4 SDslu, 0 SDs, 0 SdLazy, 7 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=9occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 5 NumberOfCodeBlocks, 5 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 1 ConstructedInterpolants, 0 QuantifiedInterpolants, 5 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 proved your program to be incorrect! Received shutdown request...