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/ldv-regression/test26-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 11:44:08,881 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 11:44:08,886 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 11:44:08,904 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 11:44:08,905 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 11:44:08,906 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 11:44:08,907 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 11:44:08,909 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 11:44:08,911 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 11:44:08,912 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 11:44:08,913 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 11:44:08,914 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 11:44:08,915 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 11:44:08,916 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 11:44:08,917 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 11:44:08,918 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 11:44:08,919 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 11:44:08,920 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 11:44:08,922 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 11:44:08,924 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 11:44:08,926 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 11:44:08,927 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 11:44:08,928 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 11:44:08,929 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 11:44:08,932 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-08 11:44:08,941 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 11:44:08,942 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 11:44:08,942 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 11:44:08,943 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 11:44:08,964 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 11:44:08,964 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 11:44:08,969 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 11:44:08,969 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 11:44:08,970 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 11:44:08,970 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 11:44:08,970 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 11:44:08,970 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 11:44:08,970 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 11:44:08,971 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 11:44:08,971 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 11:44:08,971 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 11:44:08,971 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 11:44:08,971 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 11:44:08,972 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 11:44:08,972 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 11:44:08,972 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 11:44:08,974 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 11:44:08,974 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 11:44:08,974 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 11:44:08,975 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 11:44:08,975 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 11:44:08,975 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 11:44:08,976 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 11:44:08,976 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 11:44:08,976 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 11:44:08,976 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 11:44:08,976 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 11:44:08,977 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 11:44:09,034 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 11:44:09,052 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 11:44:09,056 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 11:44:09,057 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 11:44:09,058 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 11:44:09,058 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test26-1.c [2019-08-08 11:44:09,131 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2fe2760c4/41169293b2ea48fdad08b648cb4cc4fb/FLAG0537c0c41 [2019-08-08 11:44:09,554 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 11:44:09,555 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test26-1.c [2019-08-08 11:44:09,561 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2fe2760c4/41169293b2ea48fdad08b648cb4cc4fb/FLAG0537c0c41 [2019-08-08 11:44:09,956 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2fe2760c4/41169293b2ea48fdad08b648cb4cc4fb [2019-08-08 11:44:09,965 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 11:44:09,967 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 11:44:09,968 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 11:44:09,968 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 11:44:09,972 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 11:44:09,973 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:44:09" (1/1) ... [2019-08-08 11:44:09,976 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23479a07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:09, skipping insertion in model container [2019-08-08 11:44:09,976 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:44:09" (1/1) ... [2019-08-08 11:44:09,984 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 11:44:09,998 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 11:44:10,167 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:44:10,184 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 11:44:10,196 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:44:10,213 INFO L192 MainTranslator]: Completed translation [2019-08-08 11:44:10,214 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10 WrapperNode [2019-08-08 11:44:10,214 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 11:44:10,215 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 11:44:10,215 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 11:44:10,215 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 11:44:10,314 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10" (1/1) ... [2019-08-08 11:44:10,315 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10" (1/1) ... [2019-08-08 11:44:10,322 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10" (1/1) ... [2019-08-08 11:44:10,322 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10" (1/1) ... [2019-08-08 11:44:10,334 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10" (1/1) ... [2019-08-08 11:44:10,336 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10" (1/1) ... [2019-08-08 11:44:10,337 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10" (1/1) ... [2019-08-08 11:44:10,339 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 11:44:10,340 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 11:44:10,340 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 11:44:10,340 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 11:44:10,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:44:10" (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 [2019-08-08 11:44:10,400 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 11:44:10,401 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 11:44:10,401 INFO L138 BoogieDeclarations]: Found implementation of procedure assign [2019-08-08 11:44:10,401 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 11:44:10,401 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 11:44:10,401 INFO L130 BoogieDeclarations]: Found specification of procedure assign [2019-08-08 11:44:10,401 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-08-08 11:44:10,401 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-08-08 11:44:10,402 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 11:44:10,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 11:44:10,402 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-08-08 11:44:10,402 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-08-08 11:44:10,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 11:44:10,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-08-08 11:44:10,710 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 11:44:10,710 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-08-08 11:44:10,712 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:44:10 BoogieIcfgContainer [2019-08-08 11:44:10,712 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 11:44:10,712 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 11:44:10,713 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 11:44:10,713 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 11:44:10,714 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:44:10" (1/1) ... [2019-08-08 11:44:10,725 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 11:44:10,729 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 11:44:10,734 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 11:44:10,742 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 11:44:10,744 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 11:44:10,798 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 39 [2019-08-08 11:44:10,820 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 11:44:10,820 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 11:44:10,823 INFO L179 IcfgInterpreter]: Location mainErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 19#(and (not (= |~#global~0.base| 0)) (exists ((|v_#memory_int_9| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_9| main_~pd~0.base (store (select |v_#memory_int_9| main_~pd~0.base) main_~pd~0.offset (select (select |v_#memory_int_9| main_~pd~0.base) (+ main_~pd~0.offset 4)))))) (= |~#global~0.offset| 0) (< |~#global~0.base| |#StackHeapBarrier|) (exists ((|v_#valid_6| (Array Int Int))) (and (= (store (store |v_#valid_6| 0 0) |~#global~0.base| 1) |#valid|) (= (select (store |v_#valid_6| 0 0) |~#global~0.base|) 0))) (= 0 |#NULL.base|) (= (select (select |old(#memory_int)| |~#global~0.base|) |~#global~0.offset|) 0) (not (= (select (select |#memory_int| |~#global~0.base|) (+ |~#global~0.offset| 4)) (select (select |#memory_int| main_~pd~0.base) main_~pd~0.offset))) (= 1 (select (select |old(#memory_int)| |~#global~0.base|) (+ |~#global~0.offset| 4))) (exists ((|v_#length_5| (Array Int Int))) (= (store |v_#length_5| |~#global~0.base| 8) |#length|)) (= |~#global~0.base| main_~pd~0.base) (= |#NULL.offset| 0) (= |~#global~0.offset| main_~pd~0.offset)) [2019-08-08 11:44:10,824 WARN L88 terpretationObserver]: Some locations of interest might be reachable, see reported results. [2019-08-08 11:44:10,830 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 11:44:10,833 INFO L168 Benchmark]: Toolchain (without parser) took 865.72 ms. Allocated memory was 132.6 MB in the beginning and 199.8 MB in the end (delta: 67.1 MB). Free memory was 88.1 MB in the beginning and 157.7 MB in the end (delta: -69.6 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-08-08 11:44:10,835 INFO L168 Benchmark]: CDTParser took 0.49 ms. Allocated memory is still 132.6 MB. Free memory was 106.9 MB in the beginning and 106.7 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-08-08 11:44:10,836 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.49 ms. Allocated memory is still 132.6 MB. Free memory was 87.9 MB in the beginning and 78.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2019-08-08 11:44:10,838 INFO L168 Benchmark]: Boogie Preprocessor took 124.79 ms. Allocated memory was 132.6 MB in the beginning and 199.8 MB in the end (delta: 67.1 MB). Free memory was 78.2 MB in the beginning and 176.0 MB in the end (delta: -97.8 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. [2019-08-08 11:44:10,839 INFO L168 Benchmark]: RCFGBuilder took 372.25 ms. Allocated memory is still 199.8 MB. Free memory was 176.0 MB in the beginning and 163.3 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2019-08-08 11:44:10,840 INFO L168 Benchmark]: Symbolic Interpretation took 118.23 ms. Allocated memory is still 199.8 MB. Free memory was 163.3 MB in the beginning and 157.7 MB in the end (delta: 5.6 MB). Peak memory consumption was 5.6 MB. Max. memory is 7.1 GB. [2019-08-08 11:44:10,846 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - UnprovableResult [Line: 24]: 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 0.49 ms. Allocated memory is still 132.6 MB. Free memory was 106.9 MB in the beginning and 106.7 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 246.49 ms. Allocated memory is still 132.6 MB. Free memory was 87.9 MB in the beginning and 78.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 124.79 ms. Allocated memory was 132.6 MB in the beginning and 199.8 MB in the end (delta: 67.1 MB). Free memory was 78.2 MB in the beginning and 176.0 MB in the end (delta: -97.8 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 372.25 ms. Allocated memory is still 199.8 MB. Free memory was 176.0 MB in the beginning and 163.3 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 118.23 ms. Allocated memory is still 199.8 MB. Free memory was 163.3 MB in the beginning and 157.7 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...