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/Problem16_label37.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 11:00:56,005 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 11:00:56,007 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 11:00:56,018 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 11:00:56,019 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 11:00:56,020 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 11:00:56,021 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 11:00:56,023 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 11:00:56,025 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 11:00:56,026 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 11:00:56,027 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 11:00:56,028 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 11:00:56,029 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 11:00:56,030 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 11:00:56,031 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 11:00:56,032 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 11:00:56,033 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 11:00:56,034 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 11:00:56,036 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 11:00:56,038 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 11:00:56,039 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 11:00:56,040 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 11:00:56,041 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 11:00:56,042 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 11:00:56,044 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-08 11:00:56,047 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-08 11:00:56,048 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-08 11:00:56,049 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-08 11:00:56,050 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-08 11:00:56,051 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-08 11:00:56,051 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-08 11:00:56,052 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-08 11:00:56,052 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-08 11:00:56,052 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 11:00:56,053 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 11:00:56,054 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 11:00:56,054 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 11:00:56,075 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 11:00:56,076 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 11:00:56,078 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 11:00:56,079 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 11:00:56,079 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 11:00:56,079 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 11:00:56,079 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 11:00:56,080 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 11:00:56,080 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 11:00:56,080 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 11:00:56,080 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 11:00:56,080 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 11:00:56,081 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 11:00:56,081 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 11:00:56,081 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 11:00:56,081 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 11:00:56,081 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 11:00:56,082 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 11:00:56,082 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 11:00:56,082 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 11:00:56,083 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 11:00:56,084 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 11:00:56,084 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 11:00:56,084 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 11:00:56,085 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 11:00:56,085 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 11:00:56,085 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 11:00:56,085 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 11:00:56,086 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 11:00:56,117 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 11:00:56,138 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 11:00:56,141 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 11:00:56,143 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 11:00:56,143 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 11:00:56,144 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem16_label37.c [2019-08-08 11:00:56,202 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b7630d78/5fa84781803947e798d89a564eaafa71/FLAG450173047 [2019-08-08 11:00:56,861 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 11:00:56,863 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem16_label37.c [2019-08-08 11:00:56,886 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b7630d78/5fa84781803947e798d89a564eaafa71/FLAG450173047 [2019-08-08 11:00:56,986 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b7630d78/5fa84781803947e798d89a564eaafa71 [2019-08-08 11:00:56,995 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 11:00:56,996 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 11:00:56,997 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 11:00:56,997 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 11:00:57,001 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 11:00:57,002 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:00:56" (1/1) ... [2019-08-08 11:00:57,005 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2968bf24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:57, skipping insertion in model container [2019-08-08 11:00:57,005 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:00:56" (1/1) ... [2019-08-08 11:00:57,013 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 11:00:57,101 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 11:00:57,986 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:00:57,995 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 11:00:58,348 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:00:58,370 INFO L192 MainTranslator]: Completed translation [2019-08-08 11:00:58,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58 WrapperNode [2019-08-08 11:00:58,371 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 11:00:58,372 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 11:00:58,373 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 11:00:58,373 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 11:00:58,388 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58" (1/1) ... [2019-08-08 11:00:58,388 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58" (1/1) ... [2019-08-08 11:00:58,436 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58" (1/1) ... [2019-08-08 11:00:58,436 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58" (1/1) ... [2019-08-08 11:00:58,502 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58" (1/1) ... [2019-08-08 11:00:58,532 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58" (1/1) ... [2019-08-08 11:00:58,559 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58" (1/1) ... [2019-08-08 11:00:58,575 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 11:00:58,576 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 11:00:58,576 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 11:00:58,576 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 11:00:58,577 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:00:58" (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 11:00:58,637 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 11:00:58,637 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 11:00:58,637 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-08-08 11:00:58,637 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-08-08 11:00:58,638 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 11:00:58,638 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-08-08 11:00:58,638 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-08-08 11:00:58,638 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 11:00:58,638 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-08-08 11:00:58,639 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-08-08 11:00:58,639 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 11:00:58,639 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 11:00:58,639 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 11:01:04,124 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 11:01:04,125 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-08-08 11:01:04,127 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:01:04 BoogieIcfgContainer [2019-08-08 11:01:04,127 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 11:01:04,128 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 11:01:04,128 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 11:01:04,128 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 11:01:04,129 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:01:04" (1/1) ... [2019-08-08 11:01:04,141 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 11:01:04,143 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 11:01:04,157 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 11:01:04,195 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 11:01:04,197 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 11:01:04,255 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 39 [2019-08-08 11:01:40,966 INFO L185 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 13 [2019-08-08 11:01:41,018 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 11:01:41,019 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 11:01:41,021 INFO L179 IcfgInterpreter]: Location calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 1041859#(and (= ~a16~0 9) (= ~a15~0 3) (<= ~a18~0 134) (= ~a12~0 9) (< 0 (+ ~a18~0 79))) [2019-08-08 11:01:41,023 WARN L88 terpretationObserver]: Some locations of interest might be reachable, see reported results. [2019-08-08 11:01:41,031 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 11:01:41,034 INFO L168 Benchmark]: Toolchain (without parser) took 44036.16 ms. Allocated memory was 133.7 MB in the beginning and 1.8 GB in the end (delta: 1.7 GB). Free memory was 83.7 MB in the beginning and 1.4 GB in the end (delta: -1.3 GB). Peak memory consumption was 1.7 GB. Max. memory is 7.1 GB. [2019-08-08 11:01:41,035 INFO L168 Benchmark]: CDTParser took 0.46 ms. Allocated memory is still 133.7 MB. Free memory was 106.6 MB in the beginning and 106.4 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-08-08 11:01:41,036 INFO L168 Benchmark]: CACSL2BoogieTranslator took 1374.20 ms. Allocated memory was 133.7 MB in the beginning and 224.9 MB in the end (delta: 91.2 MB). Free memory was 83.5 MB in the beginning and 173.5 MB in the end (delta: -90.0 MB). Peak memory consumption was 39.1 MB. Max. memory is 7.1 GB. [2019-08-08 11:01:41,037 INFO L168 Benchmark]: Boogie Preprocessor took 203.34 ms. Allocated memory is still 224.9 MB. Free memory was 173.5 MB in the beginning and 163.0 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2019-08-08 11:01:41,038 INFO L168 Benchmark]: RCFGBuilder took 5551.85 ms. Allocated memory was 224.9 MB in the beginning and 269.0 MB in the end (delta: 44.0 MB). Free memory was 163.0 MB in the beginning and 80.2 MB in the end (delta: 82.8 MB). Peak memory consumption was 126.8 MB. Max. memory is 7.1 GB. [2019-08-08 11:01:41,039 INFO L168 Benchmark]: Symbolic Interpretation took 36903.27 ms. Allocated memory was 269.0 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 80.2 MB in the beginning and 1.4 GB in the end (delta: -1.3 GB). Peak memory consumption was 1.6 GB. Max. memory is 7.1 GB. [2019-08-08 11:01:41,044 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - UnprovableResult [Line: 67]: 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 0.46 ms. Allocated memory is still 133.7 MB. Free memory was 106.6 MB in the beginning and 106.4 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 1374.20 ms. Allocated memory was 133.7 MB in the beginning and 224.9 MB in the end (delta: 91.2 MB). Free memory was 83.5 MB in the beginning and 173.5 MB in the end (delta: -90.0 MB). Peak memory consumption was 39.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 203.34 ms. Allocated memory is still 224.9 MB. Free memory was 173.5 MB in the beginning and 163.0 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 5551.85 ms. Allocated memory was 224.9 MB in the beginning and 269.0 MB in the end (delta: 44.0 MB). Free memory was 163.0 MB in the beginning and 80.2 MB in the end (delta: 82.8 MB). Peak memory consumption was 126.8 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 36903.27 ms. Allocated memory was 269.0 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 80.2 MB in the beginning and 1.4 GB in the end (delta: -1.3 GB). Peak memory consumption was 1.6 GB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...