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/loops/count_up_down-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 11:45:37,835 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 11:45:37,837 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 11:45:37,854 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 11:45:37,855 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 11:45:37,856 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 11:45:37,857 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 11:45:37,859 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 11:45:37,862 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 11:45:37,865 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 11:45:37,867 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 11:45:37,877 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 11:45:37,878 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 11:45:37,879 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 11:45:37,879 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 11:45:37,880 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 11:45:37,881 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 11:45:37,882 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 11:45:37,884 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 11:45:37,885 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 11:45:37,887 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 11:45:37,888 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 11:45:37,889 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 11:45:37,889 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 11:45:37,892 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-08 11:45:37,895 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-08 11:45:37,895 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-08 11:45:37,896 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-08 11:45:37,897 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-08 11:45:37,898 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-08 11:45:37,898 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-08 11:45:37,899 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-08 11:45:37,899 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-08 11:45:37,899 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 11:45:37,900 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 11:45:37,901 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 11:45:37,902 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 11:45:37,923 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 11:45:37,923 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 11:45:37,927 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 11:45:37,928 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 11:45:37,928 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 11:45:37,928 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 11:45:37,929 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 11:45:37,929 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 11:45:37,929 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 11:45:37,929 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 11:45:37,929 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 11:45:37,930 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 11:45:37,930 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 11:45:37,930 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 11:45:37,930 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 11:45:37,930 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 11:45:37,931 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 11:45:37,931 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 11:45:37,931 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 11:45:37,931 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 11:45:37,931 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 11:45:37,932 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 11:45:37,932 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 11:45:37,932 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 11:45:37,932 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 11:45:37,933 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 11:45:37,933 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 11:45:37,933 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 11:45:37,933 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 11:45:37,962 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 11:45:37,975 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 11:45:37,979 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 11:45:37,980 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 11:45:37,981 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 11:45:37,982 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/count_up_down-2.c [2019-08-08 11:45:38,055 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fab1a5bbb/7d6736ff062444749d5114802d937e34/FLAG0725c404f [2019-08-08 11:45:38,441 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 11:45:38,442 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/count_up_down-2.c [2019-08-08 11:45:38,447 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fab1a5bbb/7d6736ff062444749d5114802d937e34/FLAG0725c404f [2019-08-08 11:45:38,836 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fab1a5bbb/7d6736ff062444749d5114802d937e34 [2019-08-08 11:45:38,845 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 11:45:38,847 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 11:45:38,848 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 11:45:38,848 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 11:45:38,851 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 11:45:38,852 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:45:38" (1/1) ... [2019-08-08 11:45:38,855 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a699a33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:38, skipping insertion in model container [2019-08-08 11:45:38,855 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:45:38" (1/1) ... [2019-08-08 11:45:38,863 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 11:45:38,879 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 11:45:39,032 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:45:39,036 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 11:45:39,053 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:45:39,068 INFO L192 MainTranslator]: Completed translation [2019-08-08 11:45:39,068 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39 WrapperNode [2019-08-08 11:45:39,068 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 11:45:39,069 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 11:45:39,070 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 11:45:39,070 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 11:45:39,081 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39" (1/1) ... [2019-08-08 11:45:39,081 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39" (1/1) ... [2019-08-08 11:45:39,178 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39" (1/1) ... [2019-08-08 11:45:39,178 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39" (1/1) ... [2019-08-08 11:45:39,186 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39" (1/1) ... [2019-08-08 11:45:39,196 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39" (1/1) ... [2019-08-08 11:45:39,197 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39" (1/1) ... [2019-08-08 11:45:39,198 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 11:45:39,199 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 11:45:39,200 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 11:45:39,200 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 11:45:39,201 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:45:39" (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 11:45:39,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 11:45:39,266 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 11:45:39,266 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-08-08 11:45:39,266 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 11:45:39,267 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 11:45:39,267 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-08-08 11:45:39,267 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2019-08-08 11:45:39,267 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 11:45:39,267 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 11:45:39,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 11:45:39,579 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 11:45:39,579 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-08-08 11:45:39,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:45:39 BoogieIcfgContainer [2019-08-08 11:45:39,580 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 11:45:39,581 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 11:45:39,581 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 11:45:39,581 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 11:45:39,583 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:45:39" (1/1) ... [2019-08-08 11:45:39,595 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 11:45:39,598 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 11:45:39,605 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 11:45:39,613 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 11:45:39,615 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 11:45:39,654 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 1 [2019-08-08 11:45:39,727 INFO L185 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 [2019-08-08 11:45:39,733 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 11:45:39,733 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 11:45:39,736 INFO L179 IcfgInterpreter]: Location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 34#(and (exists ((v_main_~n~0_BEFORE_CALL_1 Int) (v_main_~y~0_BEFORE_CALL_1 Int)) (= |__VERIFIER_assert_#in~cond| (ite (not (= (mod v_main_~y~0_BEFORE_CALL_1 4294967296) (mod v_main_~n~0_BEFORE_CALL_1 4294967296))) 1 0))) (exists ((v_main_~x~0_BEFORE_CALL_1 Int)) (and (not (< 0 (mod v_main_~x~0_BEFORE_CALL_1 4294967296))) (< 0 (mod (+ v_main_~x~0_BEFORE_CALL_1 1) 4294967296)))) (= 0 __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond)) [2019-08-08 11:45:39,737 WARN L88 terpretationObserver]: Some locations of interest might be reachable, see reported results. [2019-08-08 11:45:39,755 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 11:45:39,763 INFO L168 Benchmark]: Toolchain (without parser) took 912.05 ms. Allocated memory was 138.9 MB in the beginning and 199.2 MB in the end (delta: 60.3 MB). Free memory was 87.1 MB in the beginning and 160.3 MB in the end (delta: -73.2 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-08-08 11:45:39,766 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 105.0 MB in the beginning and 104.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-08-08 11:45:39,767 INFO L168 Benchmark]: CACSL2BoogieTranslator took 221.37 ms. Allocated memory is still 138.9 MB. Free memory was 86.9 MB in the beginning and 77.9 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2019-08-08 11:45:39,768 INFO L168 Benchmark]: Boogie Preprocessor took 129.26 ms. Allocated memory was 138.9 MB in the beginning and 199.2 MB in the end (delta: 60.3 MB). Free memory was 77.9 MB in the beginning and 177.8 MB in the end (delta: -99.9 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. [2019-08-08 11:45:39,770 INFO L168 Benchmark]: RCFGBuilder took 381.64 ms. Allocated memory is still 199.2 MB. Free memory was 177.2 MB in the beginning and 165.9 MB in the end (delta: 11.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. [2019-08-08 11:45:39,771 INFO L168 Benchmark]: Symbolic Interpretation took 176.14 ms. Allocated memory is still 199.2 MB. Free memory was 165.9 MB in the beginning and 160.3 MB in the end (delta: 5.6 MB). Peak memory consumption was 5.6 MB. Max. memory is 7.1 GB. [2019-08-08 11:45:39,778 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: Interpreter reached this location of interest. Location might be reachable.. Possible FailurePath: * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 105.0 MB in the beginning and 104.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 221.37 ms. Allocated memory is still 138.9 MB. Free memory was 86.9 MB in the beginning and 77.9 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.26 ms. Allocated memory was 138.9 MB in the beginning and 199.2 MB in the end (delta: 60.3 MB). Free memory was 77.9 MB in the beginning and 177.8 MB in the end (delta: -99.9 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 381.64 ms. Allocated memory is still 199.2 MB. Free memory was 177.2 MB in the beginning and 165.9 MB in the end (delta: 11.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 176.14 ms. Allocated memory is still 199.2 MB. Free memory was 165.9 MB in the beginning and 160.3 MB in the end (delta: 5.6 MB). Peak memory consumption was 5.6 MB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...