java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/SifaC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/float-newlib/double_req_bl_1072b.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 11:42:25,689 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 11:42:25,692 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 11:42:25,704 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 11:42:25,704 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 11:42:25,705 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 11:42:25,707 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 11:42:25,709 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 11:42:25,711 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 11:42:25,712 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 11:42:25,713 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 11:42:25,714 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 11:42:25,714 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 11:42:25,715 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 11:42:25,716 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 11:42:25,717 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 11:42:25,718 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 11:42:25,719 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 11:42:25,721 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 11:42:25,723 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 11:42:25,725 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 11:42:25,726 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 11:42:25,727 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 11:42:25,728 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 11:42:25,730 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-08 11:42:25,733 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-08 11:42:25,734 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-08 11:42:25,735 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-08 11:42:25,736 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-08 11:42:25,737 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-08 11:42:25,737 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-08 11:42:25,738 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-08 11:42:25,738 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-08 11:42:25,738 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 11:42:25,739 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 11:42:25,740 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 11:42:25,740 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-08-08 11:42:25,755 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 11:42:25,755 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 11:42:25,756 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 11:42:25,757 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 11:42:25,757 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 11:42:25,757 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 11:42:25,757 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 11:42:25,757 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 11:42:25,758 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 11:42:25,758 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 11:42:25,758 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 11:42:25,758 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 11:42:25,758 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 11:42:25,759 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 11:42:25,759 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 11:42:25,759 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 11:42:25,759 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 11:42:25,759 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 11:42:25,760 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 11:42:25,760 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 11:42:25,760 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 11:42:25,760 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 11:42:25,760 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 11:42:25,761 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 11:42:25,761 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 11:42:25,761 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 11:42:25,761 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 11:42:25,761 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 11:42:25,762 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 11:42:25,790 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 11:42:25,802 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 11:42:25,805 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 11:42:25,807 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 11:42:25,807 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 11:42:25,808 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/float-newlib/double_req_bl_1072b.c [2019-08-08 11:42:25,870 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e537d8b6/cb8ff374ca024e819009c1e5a166678b/FLAG113465937 [2019-08-08 11:42:26,352 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 11:42:26,352 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/float-newlib/double_req_bl_1072b.c [2019-08-08 11:42:26,360 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e537d8b6/cb8ff374ca024e819009c1e5a166678b/FLAG113465937 [2019-08-08 11:42:26,747 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e537d8b6/cb8ff374ca024e819009c1e5a166678b [2019-08-08 11:42:26,756 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 11:42:26,758 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 11:42:26,759 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 11:42:26,759 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 11:42:26,763 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 11:42:26,764 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:42:26" (1/1) ... [2019-08-08 11:42:26,767 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58e7d1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:26, skipping insertion in model container [2019-08-08 11:42:26,768 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:42:26" (1/1) ... [2019-08-08 11:42:26,775 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 11:42:26,792 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 11:42:27,005 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:42:27,010 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 11:42:27,042 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:42:27,160 INFO L192 MainTranslator]: Completed translation [2019-08-08 11:42:27,160 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27 WrapperNode [2019-08-08 11:42:27,160 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 11:42:27,161 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 11:42:27,161 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 11:42:27,161 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 11:42:27,174 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27" (1/1) ... [2019-08-08 11:42:27,175 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27" (1/1) ... [2019-08-08 11:42:27,184 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27" (1/1) ... [2019-08-08 11:42:27,184 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27" (1/1) ... [2019-08-08 11:42:27,198 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27" (1/1) ... [2019-08-08 11:42:27,206 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27" (1/1) ... [2019-08-08 11:42:27,208 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27" (1/1) ... [2019-08-08 11:42:27,211 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 11:42:27,211 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 11:42:27,212 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 11:42:27,212 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 11:42:27,213 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:42:27" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2019-08-08 11:42:27,270 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 11:42:27,270 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 11:42:27,270 INFO L138 BoogieDeclarations]: Found implementation of procedure isnan_double [2019-08-08 11:42:27,270 INFO L138 BoogieDeclarations]: Found implementation of procedure trunc_double [2019-08-08 11:42:27,271 INFO L138 BoogieDeclarations]: Found implementation of procedure __signbit_double [2019-08-08 11:42:27,271 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 11:42:27,271 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 11:42:27,271 INFO L130 BoogieDeclarations]: Found specification of procedure isnan_double [2019-08-08 11:42:27,271 INFO L130 BoogieDeclarations]: Found specification of procedure trunc_double [2019-08-08 11:42:27,272 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-08-08 11:42:27,272 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2019-08-08 11:42:27,272 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-08-08 11:42:27,272 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-08-08 11:42:27,272 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-08-08 11:42:27,273 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2019-08-08 11:42:27,273 INFO L130 BoogieDeclarations]: Found specification of procedure __signbit_double [2019-08-08 11:42:27,273 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 11:42:27,273 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 11:42:27,273 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 11:42:27,895 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 11:42:27,895 INFO L283 CfgBuilder]: Removed 10 assume(true) statements. [2019-08-08 11:42:27,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:42:27 BoogieIcfgContainer [2019-08-08 11:42:27,897 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 11:42:27,897 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 11:42:27,897 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 11:42:27,898 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 11:42:27,899 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:42:27" (1/1) ... [2019-08-08 11:42:27,911 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 11:42:27,913 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 11:42:27,921 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 11:42:27,929 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 11:42:27,931 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 11:42:27,979 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 22 [2019-08-08 11:42:28,039 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 11:42:28,040 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 11:42:28,042 INFO L179 IcfgInterpreter]: Location mainErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 102#false [2019-08-08 11:42:28,043 INFO L84 terpretationObserver]: All locations of interest are guaranteed to be unreachable. [2019-08-08 11:42:28,045 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 11:42:28,048 INFO L168 Benchmark]: Toolchain (without parser) took 1288.87 ms. Allocated memory was 138.4 MB in the beginning and 199.8 MB in the end (delta: 61.3 MB). Free memory was 84.8 MB in the beginning and 146.3 MB in the end (delta: -61.5 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-08-08 11:42:28,050 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 138.4 MB. Free memory was 103.4 MB in the beginning and 103.2 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-08-08 11:42:28,052 INFO L168 Benchmark]: CACSL2BoogieTranslator took 402.25 ms. Allocated memory was 138.4 MB in the beginning and 199.8 MB in the end (delta: 61.3 MB). Free memory was 84.6 MB in the beginning and 177.4 MB in the end (delta: -92.7 MB). Peak memory consumption was 21.8 MB. Max. memory is 7.1 GB. [2019-08-08 11:42:28,054 INFO L168 Benchmark]: Boogie Preprocessor took 49.94 ms. Allocated memory is still 199.8 MB. Free memory was 177.4 MB in the beginning and 175.0 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2019-08-08 11:42:28,057 INFO L168 Benchmark]: RCFGBuilder took 685.41 ms. Allocated memory is still 199.8 MB. Free memory was 175.0 MB in the beginning and 152.5 MB in the end (delta: 22.6 MB). Peak memory consumption was 22.6 MB. Max. memory is 7.1 GB. [2019-08-08 11:42:28,057 INFO L168 Benchmark]: Symbolic Interpretation took 147.65 ms. Allocated memory is still 199.8 MB. Free memory was 152.5 MB in the beginning and 146.3 MB in the end (delta: 6.2 MB). Peak memory consumption was 6.2 MB. Max. memory is 7.1 GB. [2019-08-08 11:42:28,061 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - AllSpecificationsHoldResult: All specifications hold All locations of interest are guaranteed to be unreachable. * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 138.4 MB. Free memory was 103.4 MB in the beginning and 103.2 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 402.25 ms. Allocated memory was 138.4 MB in the beginning and 199.8 MB in the end (delta: 61.3 MB). Free memory was 84.6 MB in the beginning and 177.4 MB in the end (delta: -92.7 MB). Peak memory consumption was 21.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 49.94 ms. Allocated memory is still 199.8 MB. Free memory was 177.4 MB in the beginning and 175.0 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 685.41 ms. Allocated memory is still 199.8 MB. Free memory was 175.0 MB in the beginning and 152.5 MB in the end (delta: 22.6 MB). Peak memory consumption was 22.6 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 147.65 ms. Allocated memory is still 199.8 MB. Free memory was 152.5 MB in the beginning and 146.3 MB in the end (delta: 6.2 MB). Peak memory consumption was 6.2 MB. Max. memory is 7.1 GB. RESULT: Ultimate proved your program to be correct! Received shutdown request...