./Ultimate.py --spec ../sv-benchmarks/c/properties/termination.prp --file ../sv-benchmarks/c/termination-crafted-lit/ChenCookFuhsNimkarOHearn-TACAS2014-Introduction.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for termination Using default analysis Version 54858612 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerTermination.xml -i ../sv-benchmarks/c/termination-crafted-lit/ChenCookFuhsNimkarOHearn-TACAS2014-Introduction.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(F end) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 75dd2ce3f6219a56f38a72471186bda1e7610d5c .......................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(TERM) --- Real Ultimate output --- This is Ultimate 0.2.0-5485861 [2020-10-26 04:15:10,404 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-26 04:15:10,409 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-26 04:15:10,462 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-26 04:15:10,463 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-26 04:15:10,470 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-26 04:15:10,472 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-26 04:15:10,483 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-26 04:15:10,487 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-26 04:15:10,490 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-26 04:15:10,492 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-26 04:15:10,499 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-26 04:15:10,502 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-26 04:15:10,506 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-26 04:15:10,509 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-26 04:15:10,511 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-26 04:15:10,514 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-26 04:15:10,519 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-26 04:15:10,526 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-26 04:15:10,531 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-26 04:15:10,535 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-26 04:15:10,540 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-26 04:15:10,544 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-26 04:15:10,545 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-26 04:15:10,553 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-26 04:15:10,558 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-26 04:15:10,558 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-26 04:15:10,560 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-26 04:15:10,562 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-26 04:15:10,564 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-26 04:15:10,564 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-26 04:15:10,566 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-26 04:15:10,568 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-26 04:15:10,570 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-26 04:15:10,572 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-26 04:15:10,572 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-26 04:15:10,573 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-26 04:15:10,574 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-26 04:15:10,574 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-26 04:15:10,580 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-26 04:15:10,581 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-26 04:15:10,583 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-10-26 04:15:10,648 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-26 04:15:10,649 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-26 04:15:10,654 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-26 04:15:10,655 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-26 04:15:10,655 INFO L138 SettingsManager]: * Use SBE=true [2020-10-26 04:15:10,656 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-10-26 04:15:10,656 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-10-26 04:15:10,656 INFO L138 SettingsManager]: * Use old map elimination=false [2020-10-26 04:15:10,656 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-10-26 04:15:10,657 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-10-26 04:15:10,658 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-10-26 04:15:10,659 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-26 04:15:10,659 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-10-26 04:15:10,660 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-26 04:15:10,660 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-26 04:15:10,660 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-10-26 04:15:10,660 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-10-26 04:15:10,661 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-10-26 04:15:10,661 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-26 04:15:10,661 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-10-26 04:15:10,662 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-26 04:15:10,662 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-10-26 04:15:10,662 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-26 04:15:10,662 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-26 04:15:10,663 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-10-26 04:15:10,663 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-26 04:15:10,663 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-26 04:15:10,664 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-26 04:15:10,664 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-10-26 04:15:10,667 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-10-26 04:15:10,668 INFO L138 SettingsManager]: * TransformationType=MODULO_NEIGHBOR WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 75dd2ce3f6219a56f38a72471186bda1e7610d5c [2020-10-26 04:15:11,148 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-26 04:15:11,211 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-26 04:15:11,217 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-26 04:15:11,219 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-26 04:15:11,223 INFO L275 PluginConnector]: CDTParser initialized [2020-10-26 04:15:11,225 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-crafted-lit/ChenCookFuhsNimkarOHearn-TACAS2014-Introduction.c [2020-10-26 04:15:11,313 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/65d6028c1/1da9588f7ff14bc2b400e270fd00273b/FLAG986387a3e [2020-10-26 04:15:12,101 INFO L306 CDTParser]: Found 1 translation units. [2020-10-26 04:15:12,102 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-crafted-lit/ChenCookFuhsNimkarOHearn-TACAS2014-Introduction.c [2020-10-26 04:15:12,116 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/65d6028c1/1da9588f7ff14bc2b400e270fd00273b/FLAG986387a3e [2020-10-26 04:15:12,403 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/65d6028c1/1da9588f7ff14bc2b400e270fd00273b [2020-10-26 04:15:12,407 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-26 04:15:12,415 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-26 04:15:12,417 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-26 04:15:12,417 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-26 04:15:12,422 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-26 04:15:12,424 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,428 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34080d6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12, skipping insertion in model container [2020-10-26 04:15:12,429 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,439 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-26 04:15:12,455 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-26 04:15:12,618 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-26 04:15:12,623 INFO L203 MainTranslator]: Completed pre-run [2020-10-26 04:15:12,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-26 04:15:12,656 INFO L208 MainTranslator]: Completed translation [2020-10-26 04:15:12,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12 WrapperNode [2020-10-26 04:15:12,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-26 04:15:12,659 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-26 04:15:12,659 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-26 04:15:12,659 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-26 04:15:12,669 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,675 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,697 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-26 04:15:12,699 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-26 04:15:12,699 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-26 04:15:12,699 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-26 04:15:12,711 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,711 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,712 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,713 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,715 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,729 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,730 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (1/1) ... [2020-10-26 04:15:12,732 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-26 04:15:12,733 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-26 04:15:12,733 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-26 04:15:12,734 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-26 04:15:12,735 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (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:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-26 04:15:12,827 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-26 04:15:12,828 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-26 04:15:13,012 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-26 04:15:13,013 INFO L298 CfgBuilder]: Removed 5 assume(true) statements. [2020-10-26 04:15:13,015 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 04:15:13 BoogieIcfgContainer [2020-10-26 04:15:13,016 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-26 04:15:13,017 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-10-26 04:15:13,017 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-10-26 04:15:13,022 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-10-26 04:15:13,024 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-26 04:15:13,025 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 26.10 04:15:12" (1/3) ... [2020-10-26 04:15:13,026 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@28bb4d47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 26.10 04:15:13, skipping insertion in model container [2020-10-26 04:15:13,027 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-26 04:15:13,027 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 04:15:12" (2/3) ... [2020-10-26 04:15:13,028 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@28bb4d47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 26.10 04:15:13, skipping insertion in model container [2020-10-26 04:15:13,028 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-26 04:15:13,028 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 04:15:13" (3/3) ... [2020-10-26 04:15:13,031 INFO L373 chiAutomizerObserver]: Analyzing ICFG ChenCookFuhsNimkarOHearn-TACAS2014-Introduction.c [2020-10-26 04:15:13,124 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-10-26 04:15:13,125 INFO L360 BuchiCegarLoop]: Hoare is false [2020-10-26 04:15:13,125 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-10-26 04:15:13,125 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-26 04:15:13,125 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-26 04:15:13,126 INFO L364 BuchiCegarLoop]: Difference is false [2020-10-26 04:15:13,126 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-26 04:15:13,126 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-10-26 04:15:13,148 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 7 states. [2020-10-26 04:15:13,176 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 1 [2020-10-26 04:15:13,176 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-26 04:15:13,177 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-26 04:15:13,187 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-26 04:15:13,188 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1] [2020-10-26 04:15:13,188 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-10-26 04:15:13,189 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 7 states. [2020-10-26 04:15:13,190 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 1 [2020-10-26 04:15:13,190 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-26 04:15:13,191 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-26 04:15:13,191 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-26 04:15:13,192 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1] [2020-10-26 04:15:13,204 INFO L794 eck$LassoCheckResult]: Stem: 4#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet0, main_#t~nondet1, main_#t~nondet2, main_~k~0, main_~i~0;havoc main_~k~0;havoc main_~i~0;main_~k~0 := main_#t~nondet0;havoc main_#t~nondet0;main_~i~0 := main_#t~nondet1;havoc main_#t~nondet1; 8#L18true assume !(main_~k~0 >= 0);main_~i~0 := -1; 6#L23-1true [2020-10-26 04:15:13,205 INFO L796 eck$LassoCheckResult]: Loop: 6#L23-1true assume !!(main_~i~0 >= 0);main_~i~0 := main_#t~nondet2;havoc main_#t~nondet2; 6#L23-1true [2020-10-26 04:15:13,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 04:15:13,215 INFO L82 PathProgramCache]: Analyzing trace with hash 998, now seen corresponding path program 1 times [2020-10-26 04:15:13,231 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-26 04:15:13,232 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24355564] [2020-10-26 04:15:13,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 04:15:13,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,345 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,353 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,376 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-26 04:15:13,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 04:15:13,379 INFO L82 PathProgramCache]: Analyzing trace with hash 46, now seen corresponding path program 1 times [2020-10-26 04:15:13,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-26 04:15:13,380 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731289908] [2020-10-26 04:15:13,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 04:15:13,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,388 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,392 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,394 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-26 04:15:13,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 04:15:13,397 INFO L82 PathProgramCache]: Analyzing trace with hash 30953, now seen corresponding path program 1 times [2020-10-26 04:15:13,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-26 04:15:13,398 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560178987] [2020-10-26 04:15:13,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 04:15:13,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-26 04:15:13,533 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-26 04:15:13,534 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560178987] [2020-10-26 04:15:13,535 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-26 04:15:13,536 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-10-26 04:15:13,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707705676] [2020-10-26 04:15:13,656 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2020-10-26 04:15:13,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-26 04:15:13,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-26 04:15:13,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-26 04:15:13,737 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2020-10-26 04:15:13,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-26 04:15:13,770 INFO L93 Difference]: Finished difference Result 8 states and 9 transitions. [2020-10-26 04:15:13,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-26 04:15:13,774 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 8 states and 9 transitions. [2020-10-26 04:15:13,775 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 1 [2020-10-26 04:15:13,780 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 8 states to 3 states and 3 transitions. [2020-10-26 04:15:13,782 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 3 [2020-10-26 04:15:13,782 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 3 [2020-10-26 04:15:13,783 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 3 transitions. [2020-10-26 04:15:13,784 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-10-26 04:15:13,784 INFO L691 BuchiCegarLoop]: Abstraction has 3 states and 3 transitions. [2020-10-26 04:15:13,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3 states and 3 transitions. [2020-10-26 04:15:13,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3 to 3. [2020-10-26 04:15:13,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-10-26 04:15:13,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 3 transitions. [2020-10-26 04:15:13,819 INFO L714 BuchiCegarLoop]: Abstraction has 3 states and 3 transitions. [2020-10-26 04:15:13,819 INFO L594 BuchiCegarLoop]: Abstraction has 3 states and 3 transitions. [2020-10-26 04:15:13,819 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-10-26 04:15:13,820 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 3 states and 3 transitions. [2020-10-26 04:15:13,820 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 1 [2020-10-26 04:15:13,820 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-26 04:15:13,820 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-26 04:15:13,821 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-26 04:15:13,821 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1] [2020-10-26 04:15:13,821 INFO L794 eck$LassoCheckResult]: Stem: 26#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_#t~nondet1, main_#t~nondet2, main_~k~0, main_~i~0;havoc main_~k~0;havoc main_~i~0;main_~k~0 := main_#t~nondet0;havoc main_#t~nondet0;main_~i~0 := main_#t~nondet1;havoc main_#t~nondet1; 27#L18 assume main_~k~0 >= 0; 28#L23-1 [2020-10-26 04:15:13,821 INFO L796 eck$LassoCheckResult]: Loop: 28#L23-1 assume !!(main_~i~0 >= 0);main_~i~0 := main_#t~nondet2;havoc main_#t~nondet2; 28#L23-1 [2020-10-26 04:15:13,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 04:15:13,822 INFO L82 PathProgramCache]: Analyzing trace with hash 996, now seen corresponding path program 1 times [2020-10-26 04:15:13,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-26 04:15:13,823 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113135004] [2020-10-26 04:15:13,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 04:15:13,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,829 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,832 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,834 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-26 04:15:13,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 04:15:13,835 INFO L82 PathProgramCache]: Analyzing trace with hash 46, now seen corresponding path program 2 times [2020-10-26 04:15:13,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-26 04:15:13,836 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167862079] [2020-10-26 04:15:13,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 04:15:13,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,840 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,843 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,845 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-26 04:15:13,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-26 04:15:13,846 INFO L82 PathProgramCache]: Analyzing trace with hash 30891, now seen corresponding path program 1 times [2020-10-26 04:15:13,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-26 04:15:13,846 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731174754] [2020-10-26 04:15:13,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-26 04:15:13,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,852 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-26 04:15:13,857 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-26 04:15:13,859 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-26 04:15:14,042 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 26.10 04:15:14 BoogieIcfgContainer [2020-10-26 04:15:14,042 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-10-26 04:15:14,043 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-26 04:15:14,043 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-26 04:15:14,043 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-26 04:15:14,044 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 04:15:13" (3/4) ... [2020-10-26 04:15:14,048 INFO L134 WitnessPrinter]: Generating witness for non-termination counterexample [2020-10-26 04:15:14,091 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-26 04:15:14,092 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-26 04:15:14,094 INFO L168 Benchmark]: Toolchain (without parser) took 1683.63 ms. Allocated memory was 46.1 MB in the beginning and 56.6 MB in the end (delta: 10.5 MB). Free memory was 31.2 MB in the beginning and 38.7 MB in the end (delta: -7.5 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-10-26 04:15:14,095 INFO L168 Benchmark]: CDTParser took 0.44 ms. Allocated memory is still 37.7 MB. Free memory was 20.5 MB in the beginning and 20.4 MB in the end (delta: 70.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-26 04:15:14,096 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.89 ms. Allocated memory is still 46.1 MB. Free memory was 30.6 MB in the beginning and 22.2 MB in the end (delta: 8.4 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-10-26 04:15:14,097 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.15 ms. Allocated memory is still 46.1 MB. Free memory was 22.2 MB in the beginning and 20.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-26 04:15:14,098 INFO L168 Benchmark]: Boogie Preprocessor took 33.47 ms. Allocated memory is still 46.1 MB. Free memory was 20.7 MB in the beginning and 31.9 MB in the end (delta: -11.2 MB). Peak memory consumption was 4.7 MB. Max. memory is 16.1 GB. [2020-10-26 04:15:14,099 INFO L168 Benchmark]: RCFGBuilder took 282.84 ms. Allocated memory is still 46.1 MB. Free memory was 31.8 MB in the beginning and 24.3 MB in the end (delta: 7.4 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-10-26 04:15:14,100 INFO L168 Benchmark]: BuchiAutomizer took 1024.99 ms. Allocated memory was 46.1 MB in the beginning and 56.6 MB in the end (delta: 10.5 MB). Free memory was 24.2 MB in the beginning and 40.3 MB in the end (delta: -16.1 MB). Peak memory consumption was 7.9 MB. Max. memory is 16.1 GB. [2020-10-26 04:15:14,101 INFO L168 Benchmark]: Witness Printer took 49.14 ms. Allocated memory is still 56.6 MB. Free memory was 40.3 MB in the beginning and 38.7 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-26 04:15:14,106 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.44 ms. Allocated memory is still 37.7 MB. Free memory was 20.5 MB in the beginning and 20.4 MB in the end (delta: 70.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 240.89 ms. Allocated memory is still 46.1 MB. Free memory was 30.6 MB in the beginning and 22.2 MB in the end (delta: 8.4 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.15 ms. Allocated memory is still 46.1 MB. Free memory was 22.2 MB in the beginning and 20.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 33.47 ms. Allocated memory is still 46.1 MB. Free memory was 20.7 MB in the beginning and 31.9 MB in the end (delta: -11.2 MB). Peak memory consumption was 4.7 MB. Max. memory is 16.1 GB. * RCFGBuilder took 282.84 ms. Allocated memory is still 46.1 MB. Free memory was 31.8 MB in the beginning and 24.3 MB in the end (delta: 7.4 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * BuchiAutomizer took 1024.99 ms. Allocated memory was 46.1 MB in the beginning and 56.6 MB in the end (delta: 10.5 MB). Free memory was 24.2 MB in the beginning and 40.3 MB in the end (delta: -16.1 MB). Peak memory consumption was 7.9 MB. Max. memory is 16.1 GB. * Witness Printer took 49.14 ms. Allocated memory is still 56.6 MB. Free memory was 40.3 MB in the beginning and 38.7 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: Constructed decomposition of program Your program was decomposed into 1 terminating modules (1 trivial, 0 deterministic, 0 nondeterministic) and one nonterminating remainder module.1 modules have a trivial ranking function, the largest among these consists of 3 locations. The remainder module has 3 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 0.9s and 2 iterations. TraceHistogramMax:1. Analysis of lassos took 0.6s. Construction of modules took 0.0s. Büchi inclusion checks took 0.0s. Highest rank in rank-based complementation 0. Minimization of det autom 1. Minimization of nondet autom 0. Automata minimization 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations. Non-live state removal took 0.0s Buchi closure took 0.0s. Biggest automaton had 3 states and ocurred in iteration 1. Nontrivial modules had stage [0, 0, 0, 0, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 0/0 HoareTripleCheckerStatistics: 8 SDtfs, 0 SDslu, 3 SDs, 0 SdLazy, 4 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time LassoAnalysisResults: nont1 unkn0 SFLI0 SFLT0 conc1 concLT0 SILN0 SILU0 SILI0 SILT0 lasso0 LassoPreprocessingBenchmarks: LassoTerminationAnalysisBenchmarks: not availableLassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 0 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 0 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 0.0s - TerminationAnalysisResult: Nontermination possible Buchi Automizer proved that your program is nonterminating for some inputs - FixpointNonTerminationResult [Line: 23]: Nontermination argument in form of an infinite program execution. Nontermination argument in form of an infinite execution State at position 0 is {} State at position 1 is {org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@1d771035=0, \result=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@185bf9fc=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@2b12b156=0, i=0, k=0} - StatisticsResult: NonterminationArgumentStatistics Fixpoint - NonterminatingLassoResult [Line: 14]: Nonterminating execution Found a nonterminating execution for the following lasso shaped sequence of statements. Stem: [L15] int k, i; [L16] k = __VERIFIER_nondet_int() [L17] i = __VERIFIER_nondet_int() [L18] COND TRUE k >= 0 Loop: [L23] COND TRUE i >= 0 [L24] i = __VERIFIER_nondet_int() End of lasso representation. RESULT: Ultimate proved your program to be incorrect! Received shutdown request...