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/loop-new/gauss_sum.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-a32b1f7 [2019-08-18 07:22:08,921 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-18 07:22:08,923 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-18 07:22:08,934 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-18 07:22:08,934 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-18 07:22:08,935 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-18 07:22:08,936 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-18 07:22:08,938 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-18 07:22:08,940 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-18 07:22:08,941 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-18 07:22:08,942 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-18 07:22:08,943 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-18 07:22:08,943 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-18 07:22:08,944 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-18 07:22:08,945 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-18 07:22:08,946 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-18 07:22:08,947 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-18 07:22:08,948 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-18 07:22:08,949 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-18 07:22:08,951 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-18 07:22:08,953 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-18 07:22:08,954 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-18 07:22:08,955 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-18 07:22:08,956 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-18 07:22:08,958 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-18 07:22:08,961 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-18 07:22:08,962 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-18 07:22:08,963 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-18 07:22:08,963 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-18 07:22:08,964 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-18 07:22:08,965 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-18 07:22:08,965 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-18 07:22:08,965 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-18 07:22:08,966 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-18 07:22:08,966 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-18 07:22:08,967 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-18 07:22:08,968 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 [2019-08-18 07:22:08,982 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-18 07:22:08,982 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-18 07:22:08,983 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-18 07:22:08,983 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-18 07:22:08,983 INFO L138 SettingsManager]: * Use SBE=true [2019-08-18 07:22:08,984 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-18 07:22:08,984 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-18 07:22:08,984 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-18 07:22:08,984 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-18 07:22:08,984 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-18 07:22:08,985 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-18 07:22:08,985 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-18 07:22:08,985 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-18 07:22:08,985 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-18 07:22:08,985 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-18 07:22:08,986 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-18 07:22:08,986 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-18 07:22:08,986 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-18 07:22:08,986 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-18 07:22:08,986 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-18 07:22:08,987 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-18 07:22:08,987 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-18 07:22:08,987 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-18 07:22:08,987 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-18 07:22:08,987 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-18 07:22:08,988 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-18 07:22:08,988 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-18 07:22:08,988 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-18 07:22:08,988 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-18 07:22:09,016 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-18 07:22:09,028 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-18 07:22:09,031 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-18 07:22:09,032 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-18 07:22:09,033 INFO L275 PluginConnector]: CDTParser initialized [2019-08-18 07:22:09,033 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/gauss_sum.i [2019-08-18 07:22:09,104 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a63d0078/b23688199c794b9493daa845ceade5b0/FLAG5650822ce [2019-08-18 07:22:09,542 INFO L306 CDTParser]: Found 1 translation units. [2019-08-18 07:22:09,542 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/gauss_sum.i [2019-08-18 07:22:09,549 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a63d0078/b23688199c794b9493daa845ceade5b0/FLAG5650822ce [2019-08-18 07:22:09,928 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a63d0078/b23688199c794b9493daa845ceade5b0 [2019-08-18 07:22:09,938 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-18 07:22:09,940 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-18 07:22:09,941 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-18 07:22:09,941 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-18 07:22:09,945 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-18 07:22:09,946 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:22:09" (1/1) ... [2019-08-18 07:22:09,949 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bab96dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:09, skipping insertion in model container [2019-08-18 07:22:09,949 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:22:09" (1/1) ... [2019-08-18 07:22:09,957 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-18 07:22:09,978 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-18 07:22:10,206 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-18 07:22:10,211 INFO L188 MainTranslator]: Completed pre-run [2019-08-18 07:22:10,232 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-18 07:22:10,248 INFO L192 MainTranslator]: Completed translation [2019-08-18 07:22:10,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10 WrapperNode [2019-08-18 07:22:10,250 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-18 07:22:10,250 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-18 07:22:10,251 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-18 07:22:10,251 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-18 07:22:10,264 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10" (1/1) ... [2019-08-18 07:22:10,265 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10" (1/1) ... [2019-08-18 07:22:10,271 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10" (1/1) ... [2019-08-18 07:22:10,273 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10" (1/1) ... [2019-08-18 07:22:10,281 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10" (1/1) ... [2019-08-18 07:22:10,288 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10" (1/1) ... [2019-08-18 07:22:10,289 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10" (1/1) ... [2019-08-18 07:22:10,372 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-18 07:22:10,374 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-18 07:22:10,374 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-18 07:22:10,375 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-18 07:22:10,375 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:22:10" (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 [2019-08-18 07:22:10,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-18 07:22:10,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-18 07:22:10,432 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-08-18 07:22:10,432 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-18 07:22:10,432 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-18 07:22:10,433 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-08-18 07:22:10,433 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-08-18 07:22:10,433 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-08-18 07:22:10,433 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-18 07:22:10,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-18 07:22:10,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-18 07:22:10,587 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-18 07:22:10,587 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-08-18 07:22:10,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:22:10 BoogieIcfgContainer [2019-08-18 07:22:10,589 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-18 07:22:10,596 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-18 07:22:10,596 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-18 07:22:10,596 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-18 07:22:10,597 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:22:10" (1/1) ... [2019-08-18 07:22:10,623 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-18 07:22:10,633 INFO L155 IcfgInterpreter]: Building call graph [2019-08-18 07:22:10,650 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-18 07:22:10,669 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-18 07:22:10,674 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-18 07:22:10,729 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 1 [2019-08-18 07:22:10,795 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-18 07:22:10,832 INFO L185 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 [2019-08-18 07:22:10,835 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-18 07:22:10,836 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-18 07:22:10,838 INFO L179 IcfgInterpreter]: Location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 46#(and (or (= |__VERIFIER_assert_#in~cond| 1) (= |__VERIFIER_assert_#in~cond| 0)) (= 0 __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond)) [2019-08-18 07:22:10,853 INFO L92 terpretationObserver]: ✘ Some locations of interest might be reachable, see reported results. [2019-08-18 07:22:10,853 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-18 07:22:10,857 INFO L168 Benchmark]: Toolchain (without parser) took 914.66 ms. Allocated memory was 134.2 MB in the beginning and 200.3 MB in the end (delta: 66.1 MB). Free memory was 89.6 MB in the beginning and 159.2 MB in the end (delta: -69.6 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-08-18 07:22:10,858 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 134.2 MB. Free memory was 107.3 MB in the beginning and 107.1 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-08-18 07:22:10,859 INFO L168 Benchmark]: CACSL2BoogieTranslator took 308.90 ms. Allocated memory is still 134.2 MB. Free memory was 89.2 MB in the beginning and 80.2 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2019-08-18 07:22:10,860 INFO L168 Benchmark]: Boogie Preprocessor took 122.23 ms. Allocated memory was 134.2 MB in the beginning and 200.3 MB in the end (delta: 66.1 MB). Free memory was 80.2 MB in the beginning and 179.9 MB in the end (delta: -99.7 MB). Peak memory consumption was 17.1 MB. Max. memory is 7.1 GB. [2019-08-18 07:22:10,861 INFO L168 Benchmark]: RCFGBuilder took 214.62 ms. Allocated memory is still 200.3 MB. Free memory was 179.9 MB in the beginning and 166.9 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2019-08-18 07:22:10,862 INFO L168 Benchmark]: Symbolic Interpretation took 257.32 ms. Allocated memory is still 200.3 MB. Free memory was 166.9 MB in the beginning and 159.2 MB in the end (delta: 7.7 MB). Peak memory consumption was 7.7 MB. Max. memory is 7.1 GB. [2019-08-18 07:22:10,866 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - UnprovableResult [Line: 5]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: Over-approximation of reachable states at this location is 46#(and (or (= |__VERIFIER_assert_#in~cond| 1) (= |__VERIFIER_assert_#in~cond| 0)) (= 0 __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond)). Possible FailurePath: * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 134.2 MB. Free memory was 107.3 MB in the beginning and 107.1 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 308.90 ms. Allocated memory is still 134.2 MB. Free memory was 89.2 MB in the beginning and 80.2 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 122.23 ms. Allocated memory was 134.2 MB in the beginning and 200.3 MB in the end (delta: 66.1 MB). Free memory was 80.2 MB in the beginning and 179.9 MB in the end (delta: -99.7 MB). Peak memory consumption was 17.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 214.62 ms. Allocated memory is still 200.3 MB. Free memory was 179.9 MB in the beginning and 166.9 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 257.32 ms. Allocated memory is still 200.3 MB. Free memory was 166.9 MB in the beginning and 159.2 MB in the end (delta: 7.7 MB). Peak memory consumption was 7.7 MB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...