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/eca-rers2012/Problem15_label25.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 10:58:06,905 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 10:58:06,907 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 10:58:06,919 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 10:58:06,919 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 10:58:06,920 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 10:58:06,921 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 10:58:06,923 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 10:58:06,925 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 10:58:06,926 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 10:58:06,926 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 10:58:06,928 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 10:58:06,928 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 10:58:06,929 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 10:58:06,930 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 10:58:06,931 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 10:58:06,932 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 10:58:06,933 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 10:58:06,934 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 10:58:06,939 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 10:58:06,943 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 10:58:06,944 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 10:58:06,949 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 10:58:06,949 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 10:58:06,951 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-08 10:58:06,955 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-08 10:58:06,957 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-08 10:58:06,958 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-08 10:58:06,959 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-08 10:58:06,961 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-08 10:58:06,962 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-08 10:58:06,962 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-08 10:58:06,962 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-08 10:58:06,963 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 10:58:06,966 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 10:58:06,967 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 10:58:06,969 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 10:58:06,982 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 10:58:06,982 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 10:58:06,983 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 10:58:06,984 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 10:58:06,984 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 10:58:06,984 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 10:58:06,984 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 10:58:06,985 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 10:58:06,985 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 10:58:06,985 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 10:58:06,985 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 10:58:06,985 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 10:58:06,986 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 10:58:06,986 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 10:58:06,986 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 10:58:06,986 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 10:58:06,986 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 10:58:06,987 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 10:58:06,987 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 10:58:06,987 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 10:58:06,987 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 10:58:06,987 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 10:58:06,988 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 10:58:06,988 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 10:58:06,988 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 10:58:06,988 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 10:58:06,988 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 10:58:06,989 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 10:58:06,989 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 10:58:07,016 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 10:58:07,034 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 10:58:07,037 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 10:58:07,039 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 10:58:07,043 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 10:58:07,044 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem15_label25.c [2019-08-08 10:58:07,116 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a4472a7d/e12c89de46554527843ae5a8274050d9/FLAG4a5d63ba1 [2019-08-08 10:58:07,822 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 10:58:07,822 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem15_label25.c [2019-08-08 10:58:07,839 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a4472a7d/e12c89de46554527843ae5a8274050d9/FLAG4a5d63ba1 [2019-08-08 10:58:07,965 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a4472a7d/e12c89de46554527843ae5a8274050d9 [2019-08-08 10:58:07,975 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 10:58:07,976 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 10:58:07,977 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 10:58:07,978 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 10:58:07,981 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 10:58:07,982 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 10:58:07" (1/1) ... [2019-08-08 10:58:07,984 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@186e76d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:07, skipping insertion in model container [2019-08-08 10:58:07,985 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 10:58:07" (1/1) ... [2019-08-08 10:58:07,992 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 10:58:08,075 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 10:58:08,799 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 10:58:09,000 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 10:58:09,378 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 10:58:09,404 INFO L192 MainTranslator]: Completed translation [2019-08-08 10:58:09,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09 WrapperNode [2019-08-08 10:58:09,406 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 10:58:09,407 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 10:58:09,407 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 10:58:09,407 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 10:58:09,422 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09" (1/1) ... [2019-08-08 10:58:09,423 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09" (1/1) ... [2019-08-08 10:58:09,468 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09" (1/1) ... [2019-08-08 10:58:09,470 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09" (1/1) ... [2019-08-08 10:58:09,543 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09" (1/1) ... [2019-08-08 10:58:09,576 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09" (1/1) ... [2019-08-08 10:58:09,615 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09" (1/1) ... [2019-08-08 10:58:09,642 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 10:58:09,643 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 10:58:09,643 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 10:58:09,643 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 10:58:09,644 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:58:09" (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 10:58:09,723 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 10:58:09,724 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 10:58:09,724 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-08-08 10:58:09,724 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-08-08 10:58:09,724 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 10:58:09,724 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-08-08 10:58:09,725 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-08-08 10:58:09,725 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 10:58:09,725 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-08-08 10:58:09,725 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-08-08 10:58:09,726 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 10:58:09,726 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 10:58:09,726 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 10:58:14,965 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 10:58:14,965 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-08-08 10:58:14,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 10:58:14 BoogieIcfgContainer [2019-08-08 10:58:14,967 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 10:58:14,967 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 10:58:14,968 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 10:58:14,968 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 10:58:14,969 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 10:58:14" (1/1) ... [2019-08-08 10:58:14,980 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 10:58:14,982 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 10:58:14,994 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 10:58:15,002 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 10:58:15,003 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 10:58:15,052 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 42 [2019-08-08 10:58:25,836 INFO L185 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 13 [2019-08-08 10:58:25,884 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 10:58:25,884 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 10:58:25,887 INFO L179 IcfgInterpreter]: Location calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 359259#(and (<= (+ ~a4~0 86) 0) (<= (+ ~a0~0 98) 0) (< 0 (+ ~a29~0 16)) (<= ~a29~0 43) (< 0 (+ ~a0~0 147)) (= 2 ~a2~0)) [2019-08-08 10:58:25,888 WARN L88 terpretationObserver]: Some locations of interest might be reachable, see reported results. [2019-08-08 10:58:25,896 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 10:58:25,900 INFO L168 Benchmark]: Toolchain (without parser) took 17922.06 ms. Allocated memory was 140.0 MB in the beginning and 1.1 GB in the end (delta: 985.1 MB). Free memory was 81.5 MB in the beginning and 933.3 MB in the end (delta: -851.9 MB). Peak memory consumption was 891.4 MB. Max. memory is 7.1 GB. [2019-08-08 10:58:25,900 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 140.0 MB. Free memory is still 105.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-08-08 10:58:25,901 INFO L168 Benchmark]: CACSL2BoogieTranslator took 1428.96 ms. Allocated memory was 140.0 MB in the beginning and 224.4 MB in the end (delta: 84.4 MB). Free memory was 81.5 MB in the beginning and 162.9 MB in the end (delta: -81.4 MB). Peak memory consumption was 39.5 MB. Max. memory is 7.1 GB. [2019-08-08 10:58:25,903 INFO L168 Benchmark]: Boogie Preprocessor took 235.66 ms. Allocated memory is still 224.4 MB. Free memory was 162.9 MB in the beginning and 151.4 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2019-08-08 10:58:25,905 INFO L168 Benchmark]: RCFGBuilder took 5324.53 ms. Allocated memory was 224.4 MB in the beginning and 281.0 MB in the end (delta: 56.6 MB). Free memory was 150.2 MB in the beginning and 206.6 MB in the end (delta: -56.4 MB). Peak memory consumption was 131.9 MB. Max. memory is 7.1 GB. [2019-08-08 10:58:25,906 INFO L168 Benchmark]: Symbolic Interpretation took 10929.13 ms. Allocated memory was 281.0 MB in the beginning and 1.1 GB in the end (delta: 844.1 MB). Free memory was 206.6 MB in the beginning and 933.3 MB in the end (delta: -726.8 MB). Peak memory consumption was 875.4 MB. Max. memory is 7.1 GB. [2019-08-08 10:58:25,916 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - UnprovableResult [Line: 79]: 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 0.22 ms. Allocated memory is still 140.0 MB. Free memory is still 105.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 1428.96 ms. Allocated memory was 140.0 MB in the beginning and 224.4 MB in the end (delta: 84.4 MB). Free memory was 81.5 MB in the beginning and 162.9 MB in the end (delta: -81.4 MB). Peak memory consumption was 39.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 235.66 ms. Allocated memory is still 224.4 MB. Free memory was 162.9 MB in the beginning and 151.4 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 5324.53 ms. Allocated memory was 224.4 MB in the beginning and 281.0 MB in the end (delta: 56.6 MB). Free memory was 150.2 MB in the beginning and 206.6 MB in the end (delta: -56.4 MB). Peak memory consumption was 131.9 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 10929.13 ms. Allocated memory was 281.0 MB in the beginning and 1.1 GB in the end (delta: 844.1 MB). Free memory was 206.6 MB in the beginning and 933.3 MB in the end (delta: -726.8 MB). Peak memory consumption was 875.4 MB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...