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-acceleration/simple_4-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 11:46:14,232 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 11:46:14,234 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 11:46:14,246 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 11:46:14,246 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 11:46:14,247 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 11:46:14,248 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 11:46:14,250 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 11:46:14,252 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 11:46:14,253 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 11:46:14,254 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 11:46:14,255 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 11:46:14,255 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 11:46:14,256 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 11:46:14,257 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 11:46:14,258 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 11:46:14,259 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 11:46:14,260 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 11:46:14,262 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 11:46:14,264 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 11:46:14,265 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 11:46:14,266 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 11:46:14,268 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 11:46:14,268 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 11:46:14,270 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-08 11:46:14,275 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-08 11:46:14,276 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-08 11:46:14,278 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-08 11:46:14,279 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-08 11:46:14,280 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-08 11:46:14,280 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-08 11:46:14,283 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-08 11:46:14,283 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-08 11:46:14,284 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 11:46:14,284 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 11:46:14,285 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 11:46:14,286 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 11:46:14,310 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 11:46:14,310 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 11:46:14,313 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 11:46:14,313 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 11:46:14,313 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 11:46:14,313 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 11:46:14,313 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 11:46:14,314 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 11:46:14,314 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 11:46:14,314 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 11:46:14,315 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 11:46:14,315 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 11:46:14,315 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 11:46:14,316 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 11:46:14,316 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 11:46:14,316 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 11:46:14,316 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 11:46:14,317 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 11:46:14,317 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 11:46:14,317 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 11:46:14,317 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 11:46:14,317 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 11:46:14,318 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 11:46:14,318 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 11:46:14,318 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 11:46:14,318 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 11:46:14,319 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 11:46:14,319 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 11:46:14,319 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 11:46:14,360 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 11:46:14,376 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 11:46:14,380 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 11:46:14,381 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 11:46:14,381 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 11:46:14,382 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-1.c [2019-08-08 11:46:14,453 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d3965abe/5c5dc1749963433c9aee89b9061074c9/FLAGec707e87f [2019-08-08 11:46:14,885 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 11:46:14,885 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-1.c [2019-08-08 11:46:14,890 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d3965abe/5c5dc1749963433c9aee89b9061074c9/FLAGec707e87f [2019-08-08 11:46:15,242 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d3965abe/5c5dc1749963433c9aee89b9061074c9 [2019-08-08 11:46:15,253 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 11:46:15,255 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 11:46:15,256 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 11:46:15,256 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 11:46:15,260 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 11:46:15,261 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,264 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ad3ef9d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15, skipping insertion in model container [2019-08-08 11:46:15,264 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,272 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 11:46:15,292 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 11:46:15,455 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:46:15,462 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 11:46:15,480 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:46:15,502 INFO L192 MainTranslator]: Completed translation [2019-08-08 11:46:15,502 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15 WrapperNode [2019-08-08 11:46:15,503 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 11:46:15,504 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 11:46:15,504 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 11:46:15,504 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 11:46:15,514 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,518 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,519 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,522 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,526 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,527 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,622 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 11:46:15,623 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 11:46:15,623 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 11:46:15,623 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 11:46:15,624 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:46:15" (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 11:46:15,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 11:46:15,676 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 11:46:15,676 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-08-08 11:46:15,676 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 11:46:15,676 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 11:46:15,676 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-08-08 11:46:15,676 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 11:46:15,676 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 11:46:15,676 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 11:46:15,867 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 11:46:15,870 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-08-08 11:46:15,871 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:46:15 BoogieIcfgContainer [2019-08-08 11:46:15,872 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 11:46:15,872 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 11:46:15,872 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 11:46:15,873 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 11:46:15,873 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:46:15" (1/1) ... [2019-08-08 11:46:15,883 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 11:46:15,885 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 11:46:15,891 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 11:46:15,897 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 11:46:15,899 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 11:46:15,933 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 1 [2019-08-08 11:46:15,992 INFO L185 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 [2019-08-08 11:46:16,000 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 11:46:16,000 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 11:46:16,002 INFO L179 IcfgInterpreter]: Location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 34#(and (= 0 __VERIFIER_assert_~cond) (exists ((v_main_~x~0_BEFORE_CALL_1 Int)) (and (not (< 1 (mod v_main_~x~0_BEFORE_CALL_1 4294967296))) (= |__VERIFIER_assert_#in~cond| (ite (= (mod (ite (and (< (mod v_main_~x~0_BEFORE_CALL_1 4294967296) 0) (not (= (mod v_main_~x~0_BEFORE_CALL_1 2) 0))) (+ (mod v_main_~x~0_BEFORE_CALL_1 2) (- 2)) (mod v_main_~x~0_BEFORE_CALL_1 2)) 4294967296) 0) 1 0)) (< 1 (mod (+ v_main_~x~0_BEFORE_CALL_1 2) 4294967296)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond)) [2019-08-08 11:46:16,003 WARN L88 terpretationObserver]: Some locations of interest might be reachable, see reported results. [2019-08-08 11:46:16,011 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 11:46:16,014 INFO L168 Benchmark]: Toolchain (without parser) took 758.44 ms. Allocated memory was 140.5 MB in the beginning and 200.8 MB in the end (delta: 60.3 MB). Free memory was 88.5 MB in the beginning and 163.2 MB in the end (delta: -74.7 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-08-08 11:46:16,016 INFO L168 Benchmark]: CDTParser took 0.47 ms. Allocated memory is still 140.5 MB. Free memory was 106.5 MB in the beginning and 106.3 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-08-08 11:46:16,017 INFO L168 Benchmark]: CACSL2BoogieTranslator took 248.08 ms. Allocated memory is still 140.5 MB. Free memory was 88.3 MB in the beginning and 78.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2019-08-08 11:46:16,018 INFO L168 Benchmark]: Boogie Preprocessor took 118.75 ms. Allocated memory was 140.5 MB in the beginning and 200.8 MB in the end (delta: 60.3 MB). Free memory was 78.8 MB in the beginning and 180.4 MB in the end (delta: -101.6 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2019-08-08 11:46:16,019 INFO L168 Benchmark]: RCFGBuilder took 248.74 ms. Allocated memory is still 200.8 MB. Free memory was 180.4 MB in the beginning and 169.4 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2019-08-08 11:46:16,020 INFO L168 Benchmark]: Symbolic Interpretation took 139.33 ms. Allocated memory is still 200.8 MB. Free memory was 169.4 MB in the beginning and 163.2 MB in the end (delta: 6.2 MB). Peak memory consumption was 6.2 MB. Max. memory is 7.1 GB. [2019-08-08 11:46:16,025 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 0.47 ms. Allocated memory is still 140.5 MB. Free memory was 106.5 MB in the beginning and 106.3 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 248.08 ms. Allocated memory is still 140.5 MB. Free memory was 88.3 MB in the beginning and 78.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 118.75 ms. Allocated memory was 140.5 MB in the beginning and 200.8 MB in the end (delta: 60.3 MB). Free memory was 78.8 MB in the beginning and 180.4 MB in the end (delta: -101.6 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 248.74 ms. Allocated memory is still 200.8 MB. Free memory was 180.4 MB in the beginning and 169.4 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 139.33 ms. Allocated memory is still 200.8 MB. Free memory was 169.4 MB in the beginning and 163.2 MB in the end (delta: 6.2 MB). Peak memory consumption was 6.2 MB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...