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/Problem04_label21.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 10:03:30,587 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 10:03:30,590 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 10:03:30,601 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 10:03:30,602 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 10:03:30,603 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 10:03:30,604 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 10:03:30,606 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 10:03:30,608 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 10:03:30,608 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 10:03:30,609 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 10:03:30,610 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 10:03:30,611 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 10:03:30,612 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 10:03:30,613 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 10:03:30,614 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 10:03:30,615 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 10:03:30,616 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 10:03:30,617 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 10:03:30,619 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 10:03:30,621 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 10:03:30,622 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 10:03:30,623 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 10:03:30,624 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 10:03:30,626 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-08 10:03:30,634 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 10:03:30,635 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 10:03:30,636 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 10:03:30,638 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 10:03:30,652 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 10:03:30,653 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 10:03:30,654 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 10:03:30,654 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 10:03:30,654 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 10:03:30,654 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 10:03:30,655 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 10:03:30,655 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 10:03:30,655 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 10:03:30,655 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 10:03:30,655 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 10:03:30,656 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 10:03:30,656 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 10:03:30,656 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 10:03:30,656 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 10:03:30,656 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 10:03:30,657 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 10:03:30,657 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 10:03:30,657 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 10:03:30,657 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 10:03:30,657 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 10:03:30,658 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 10:03:30,658 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 10:03:30,658 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 10:03:30,658 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 10:03:30,658 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 10:03:30,659 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 10:03:30,659 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 10:03:30,659 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 10:03:30,699 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 10:03:30,717 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 10:03:30,720 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 10:03:30,721 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 10:03:30,721 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 10:03:30,722 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem04_label21.c [2019-08-08 10:03:30,793 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf177197f/93792003c84e464d9442706048f39c70/FLAGebf620702 [2019-08-08 10:03:31,556 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 10:03:31,558 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem04_label21.c [2019-08-08 10:03:31,594 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf177197f/93792003c84e464d9442706048f39c70/FLAGebf620702 [2019-08-08 10:03:31,639 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf177197f/93792003c84e464d9442706048f39c70 [2019-08-08 10:03:31,652 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 10:03:31,657 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 10:03:31,659 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 10:03:31,659 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 10:03:31,663 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 10:03:31,664 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 10:03:31" (1/1) ... [2019-08-08 10:03:31,667 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7300415 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:31, skipping insertion in model container [2019-08-08 10:03:31,668 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 10:03:31" (1/1) ... [2019-08-08 10:03:31,675 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 10:03:31,846 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 10:03:33,387 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 10:03:33,396 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 10:03:34,001 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 10:03:34,031 INFO L192 MainTranslator]: Completed translation [2019-08-08 10:03:34,032 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34 WrapperNode [2019-08-08 10:03:34,032 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 10:03:34,033 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 10:03:34,033 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 10:03:34,034 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 10:03:34,049 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34" (1/1) ... [2019-08-08 10:03:34,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34" (1/1) ... [2019-08-08 10:03:34,097 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34" (1/1) ... [2019-08-08 10:03:34,097 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34" (1/1) ... [2019-08-08 10:03:34,197 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34" (1/1) ... [2019-08-08 10:03:34,236 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34" (1/1) ... [2019-08-08 10:03:34,265 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34" (1/1) ... [2019-08-08 10:03:34,293 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 10:03:34,293 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 10:03:34,293 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 10:03:34,294 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 10:03:34,295 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 10:03:34" (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 10:03:34,377 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 10:03:34,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 10:03:34,378 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-08-08 10:03:34,378 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-08-08 10:03:34,378 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-08-08 10:03:34,378 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2019-08-08 10:03:34,379 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 10:03:34,379 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-08-08 10:03:34,379 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-08-08 10:03:34,380 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-08-08 10:03:34,380 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2019-08-08 10:03:34,381 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 10:03:34,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-08-08 10:03:34,382 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-08-08 10:03:34,384 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 10:03:34,384 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 10:03:34,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 10:03:43,839 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 10:03:43,840 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-08-08 10:03:43,842 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 10:03:43 BoogieIcfgContainer [2019-08-08 10:03:43,842 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 10:03:43,843 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 10:03:43,843 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 10:03:43,843 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 10:03:43,844 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 10:03:43" (1/1) ... [2019-08-08 10:03:43,855 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 10:03:43,857 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 10:03:43,875 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 10:03:43,884 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 10:03:43,885 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 10:03:43,939 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 69 [2019-08-08 10:03:46,636 INFO L185 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 114 [2019-08-08 10:03:46,921 INFO L185 IcfgInterpreter]: Interpreting procedure calculate_output2 with input of size 19 [2019-08-08 10:03:47,100 INFO L185 IcfgInterpreter]: Interpreting procedure calculate_output3 with input of size 53 [2019-08-08 10:03:47,271 INFO L185 IcfgInterpreter]: Interpreting procedure calculate_output4 with input of size 57 [2019-08-08 10:03:47,462 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 10:03:47,462 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 10:03:47,464 INFO L179 IcfgInterpreter]: Location calculate_output4Err0ASSERT_VIOLATIONERROR_FUNCTION has predicate 68812#(and (= ~a14~0 18) (= 1 ~a1~0) (= ~a28~0 16) (= 1 ~a3~0) (= ~a26~0 18) (not (= 1 ~a7~0)) (= ~a25~0 1) (= 16 ~a4~0)) [2019-08-08 10:03:47,465 WARN L88 terpretationObserver]: Some locations of interest might be reachable, see reported results. [2019-08-08 10:03:47,473 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 10:03:47,476 INFO L168 Benchmark]: Toolchain (without parser) took 15821.54 ms. Allocated memory was 132.6 MB in the beginning and 546.8 MB in the end (delta: 414.2 MB). Free memory was 70.4 MB in the beginning and 282.8 MB in the end (delta: -212.4 MB). Peak memory consumption was 307.9 MB. Max. memory is 7.1 GB. [2019-08-08 10:03:47,477 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 132.6 MB. Free memory was 104.5 MB in the beginning and 104.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2019-08-08 10:03:47,478 INFO L168 Benchmark]: CACSL2BoogieTranslator took 2373.81 ms. Allocated memory was 132.6 MB in the beginning and 253.2 MB in the end (delta: 120.6 MB). Free memory was 70.0 MB in the beginning and 129.3 MB in the end (delta: -59.3 MB). Peak memory consumption was 84.6 MB. Max. memory is 7.1 GB. [2019-08-08 10:03:47,479 INFO L168 Benchmark]: Boogie Preprocessor took 259.68 ms. Allocated memory is still 253.2 MB. Free memory was 129.3 MB in the beginning and 100.0 MB in the end (delta: 29.3 MB). Peak memory consumption was 29.3 MB. Max. memory is 7.1 GB. [2019-08-08 10:03:47,480 INFO L168 Benchmark]: RCFGBuilder took 9549.06 ms. Allocated memory was 253.2 MB in the beginning and 393.7 MB in the end (delta: 140.5 MB). Free memory was 100.0 MB in the beginning and 185.1 MB in the end (delta: -85.1 MB). Peak memory consumption was 154.7 MB. Max. memory is 7.1 GB. [2019-08-08 10:03:47,481 INFO L168 Benchmark]: Symbolic Interpretation took 3630.38 ms. Allocated memory was 393.7 MB in the beginning and 546.8 MB in the end (delta: 153.1 MB). Free memory was 185.1 MB in the beginning and 282.8 MB in the end (delta: -97.7 MB). Peak memory consumption was 161.5 MB. Max. memory is 7.1 GB. [2019-08-08 10:03:47,485 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - UnprovableResult [Line: 4745]: 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 0.20 ms. Allocated memory is still 132.6 MB. Free memory was 104.5 MB in the beginning and 104.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 2373.81 ms. Allocated memory was 132.6 MB in the beginning and 253.2 MB in the end (delta: 120.6 MB). Free memory was 70.0 MB in the beginning and 129.3 MB in the end (delta: -59.3 MB). Peak memory consumption was 84.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 259.68 ms. Allocated memory is still 253.2 MB. Free memory was 129.3 MB in the beginning and 100.0 MB in the end (delta: 29.3 MB). Peak memory consumption was 29.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 9549.06 ms. Allocated memory was 253.2 MB in the beginning and 393.7 MB in the end (delta: 140.5 MB). Free memory was 100.0 MB in the beginning and 185.1 MB in the end (delta: -85.1 MB). Peak memory consumption was 154.7 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 3630.38 ms. Allocated memory was 393.7 MB in the beginning and 546.8 MB in the end (delta: 153.1 MB). Free memory was 185.1 MB in the beginning and 282.8 MB in the end (delta: -97.7 MB). Peak memory consumption was 161.5 MB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...