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/float-benchs/drift_tenth.c.p+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 11:40:28,373 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 11:40:28,375 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 11:40:28,389 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 11:40:28,390 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 11:40:28,391 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 11:40:28,392 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 11:40:28,394 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 11:40:28,396 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 11:40:28,397 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 11:40:28,398 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 11:40:28,399 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 11:40:28,399 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 11:40:28,400 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 11:40:28,401 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 11:40:28,403 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 11:40:28,404 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 11:40:28,405 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 11:40:28,406 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 11:40:28,409 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 11:40:28,410 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 11:40:28,411 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 11:40:28,413 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 11:40:28,413 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 11:40:28,416 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-08-08 11:40:28,416 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-08-08 11:40:28,416 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-08-08 11:40:28,417 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-08-08 11:40:28,418 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-08-08 11:40:28,419 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-08-08 11:40:28,419 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-08 11:40:28,420 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-08 11:40:28,420 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-08 11:40:28,421 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-08 11:40:28,422 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-08 11:40:28,423 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-08 11:40:28,423 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-08 11:40:28,424 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-08 11:40:28,424 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 11:40:28,425 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 11:40:28,425 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 11:40:28,426 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 11:40:28,453 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 11:40:28,457 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 11:40:28,458 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 11:40:28,459 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 11:40:28,459 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 11:40:28,459 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 11:40:28,459 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 11:40:28,460 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 11:40:28,460 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 11:40:28,460 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 11:40:28,460 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 11:40:28,460 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 11:40:28,461 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 11:40:28,461 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 11:40:28,461 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 11:40:28,462 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 11:40:28,463 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 11:40:28,463 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 11:40:28,463 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 11:40:28,464 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 11:40:28,464 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 11:40:28,464 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 11:40:28,464 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 11:40:28,464 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 11:40:28,465 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 11:40:28,465 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 11:40:28,465 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 11:40:28,465 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 11:40:28,465 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 11:40:28,512 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 11:40:28,523 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 11:40:28,526 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 11:40:28,528 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 11:40:28,528 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 11:40:28,529 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/float-benchs/drift_tenth.c.p+cfa-reducer.c [2019-08-08 11:40:28,588 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e9314ed1f/d051c8b6d3ad41a49bdd8c0fafb85d24/FLAG4f9c4d8eb [2019-08-08 11:40:29,063 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 11:40:29,063 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/float-benchs/drift_tenth.c.p+cfa-reducer.c [2019-08-08 11:40:29,070 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e9314ed1f/d051c8b6d3ad41a49bdd8c0fafb85d24/FLAG4f9c4d8eb [2019-08-08 11:40:29,425 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e9314ed1f/d051c8b6d3ad41a49bdd8c0fafb85d24 [2019-08-08 11:40:29,438 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 11:40:29,439 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 11:40:29,440 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 11:40:29,441 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 11:40:29,444 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 11:40:29,445 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,448 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@342dfe2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29, skipping insertion in model container [2019-08-08 11:40:29,448 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,456 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 11:40:29,477 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 11:40:29,660 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:40:29,667 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 11:40:29,691 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:40:29,708 INFO L192 MainTranslator]: Completed translation [2019-08-08 11:40:29,709 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29 WrapperNode [2019-08-08 11:40:29,709 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 11:40:29,710 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 11:40:29,711 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 11:40:29,711 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 11:40:29,726 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,726 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,732 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,734 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,826 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,831 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,832 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29" (1/1) ... [2019-08-08 11:40:29,833 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 11:40:29,834 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 11:40:29,834 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 11:40:29,834 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 11:40:29,835 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:40:29" (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 11:40:29,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 11:40:29,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 11:40:29,884 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 11:40:29,884 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 11:40:29,884 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-08-08 11:40:29,884 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 11:40:29,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 11:40:29,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 11:40:30,051 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 11:40:30,052 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-08-08 11:40:30,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:40:30 BoogieIcfgContainer [2019-08-08 11:40:30,053 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 11:40:30,053 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 11:40:30,054 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 11:40:30,054 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 11:40:30,055 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:40:30" (1/1) ... [2019-08-08 11:40:30,066 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 11:40:30,068 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 11:40:30,074 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 11:40:30,083 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 11:40:30,084 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 11:40:30,122 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 3 [2019-08-08 11:40:30,183 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 11:40:30,183 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 11:40:30,185 INFO L179 IcfgInterpreter]: Location mainErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 30#(and (< main_~main__i~0 11) (not (< main_~main__i~0 10)) (= main_~__VERIFIER_assert__cond~0 0) (= main_~__tmp_1~0 main_~__VERIFIER_assert__cond~0) (exists ((v_~someBinaryDOUBLEComparisonOperation_2 Bool)) (= main_~__tmp_1~0 (ite v_~someBinaryDOUBLEComparisonOperation_2 1 0)))) [2019-08-08 11:40:30,187 WARN L88 terpretationObserver]: Some locations of interest might be reachable, see reported results. [2019-08-08 11:40:30,194 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 11:40:30,196 INFO L168 Benchmark]: Toolchain (without parser) took 756.25 ms. Allocated memory was 131.6 MB in the beginning and 199.2 MB in the end (delta: 67.6 MB). Free memory was 87.7 MB in the beginning and 159.9 MB in the end (delta: -72.2 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-08-08 11:40:30,197 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 131.6 MB. Free memory was 105.9 MB in the beginning and 105.6 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2019-08-08 11:40:30,198 INFO L168 Benchmark]: CACSL2BoogieTranslator took 269.58 ms. Allocated memory is still 131.6 MB. Free memory was 87.4 MB in the beginning and 78.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2019-08-08 11:40:30,199 INFO L168 Benchmark]: Boogie Preprocessor took 123.25 ms. Allocated memory was 131.6 MB in the beginning and 199.2 MB in the end (delta: 67.6 MB). Free memory was 78.1 MB in the beginning and 176.2 MB in the end (delta: -98.1 MB). Peak memory consumption was 16.9 MB. Max. memory is 7.1 GB. [2019-08-08 11:40:30,200 INFO L168 Benchmark]: RCFGBuilder took 219.13 ms. Allocated memory is still 199.2 MB. Free memory was 176.2 MB in the beginning and 166.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2019-08-08 11:40:30,201 INFO L168 Benchmark]: Symbolic Interpretation took 140.51 ms. Allocated memory is still 199.2 MB. Free memory was 166.3 MB in the beginning and 159.9 MB in the end (delta: 6.4 MB). Peak memory consumption was 6.4 MB. Max. memory is 7.1 GB. [2019-08-08 11:40:30,205 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - UnprovableResult [Line: 27]: 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 0.23 ms. Allocated memory is still 131.6 MB. Free memory was 105.9 MB in the beginning and 105.6 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 269.58 ms. Allocated memory is still 131.6 MB. Free memory was 87.4 MB in the beginning and 78.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 123.25 ms. Allocated memory was 131.6 MB in the beginning and 199.2 MB in the end (delta: 67.6 MB). Free memory was 78.1 MB in the beginning and 176.2 MB in the end (delta: -98.1 MB). Peak memory consumption was 16.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 219.13 ms. Allocated memory is still 199.2 MB. Free memory was 176.2 MB in the beginning and 166.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 140.51 ms. Allocated memory is still 199.2 MB. Free memory was 166.3 MB in the beginning and 159.9 MB in the end (delta: 6.4 MB). Peak memory consumption was 6.4 MB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...