./Ultimate.py --spec ../sv-benchmarks/c/properties/termination.prp --file ../sv-benchmarks/c/termination-restricted-15/NO_03.c --full-output -ea --architecture 64bit -------------------------------------------------------------------------------- Checking for termination Using default analysis Version 8bd4bc60 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -ea -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.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-restricted-15/NO_03.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 89ce36fdd9a6142844b72609f6c752ece8563e1f ....................................................................................................................................................................................................................................................................................................................................................... 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 0.1.25-8bd4bc6 [2020-07-29 01:30:20,465 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-29 01:30:20,467 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-29 01:30:20,480 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-29 01:30:20,480 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-29 01:30:20,482 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-29 01:30:20,483 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-29 01:30:20,485 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-29 01:30:20,488 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-29 01:30:20,489 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-29 01:30:20,490 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-29 01:30:20,492 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-29 01:30:20,492 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-29 01:30:20,493 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-29 01:30:20,495 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-29 01:30:20,496 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-29 01:30:20,497 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-29 01:30:20,499 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-29 01:30:20,501 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-29 01:30:20,504 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-29 01:30:20,506 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-29 01:30:20,507 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-29 01:30:20,509 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-29 01:30:20,510 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-29 01:30:20,512 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-29 01:30:20,513 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-29 01:30:20,513 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-29 01:30:20,514 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-29 01:30:20,515 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-29 01:30:20,516 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-29 01:30:20,516 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-29 01:30:20,517 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-29 01:30:20,518 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-29 01:30:20,519 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-29 01:30:20,520 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-29 01:30:20,520 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-29 01:30:20,521 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-29 01:30:20,522 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-29 01:30:20,522 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-29 01:30:20,523 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-29 01:30:20,524 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-29 01:30:20,525 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-07-29 01:30:20,545 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-29 01:30:20,545 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-29 01:30:20,546 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-29 01:30:20,547 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-29 01:30:20,547 INFO L138 SettingsManager]: * Use SBE=true [2020-07-29 01:30:20,548 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-07-29 01:30:20,548 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-07-29 01:30:20,548 INFO L138 SettingsManager]: * Use old map elimination=false [2020-07-29 01:30:20,549 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-07-29 01:30:20,549 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-07-29 01:30:20,550 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-07-29 01:30:20,550 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-29 01:30:20,551 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-07-29 01:30:20,551 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-29 01:30:20,552 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-29 01:30:20,552 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-07-29 01:30:20,552 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-07-29 01:30:20,552 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-07-29 01:30:20,553 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-29 01:30:20,553 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-07-29 01:30:20,553 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-29 01:30:20,553 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-07-29 01:30:20,554 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-29 01:30:20,554 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-29 01:30:20,554 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-07-29 01:30:20,555 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-29 01:30:20,555 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-29 01:30:20,555 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-29 01:30:20,555 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-07-29 01:30:20,557 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-07-29 01:30:20,557 INFO L138 SettingsManager]: * TransformationType=MODULO_NEIGHBOR 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 -> 89ce36fdd9a6142844b72609f6c752ece8563e1f [2020-07-29 01:30:20,892 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-29 01:30:20,905 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-29 01:30:20,910 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-29 01:30:20,911 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-29 01:30:20,916 INFO L275 PluginConnector]: CDTParser initialized [2020-07-29 01:30:20,917 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-restricted-15/NO_03.c [2020-07-29 01:30:20,978 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b3931db2/2081c30ebbd1457386713474d8f71bd6/FLAG85a38f2b2 [2020-07-29 01:30:21,402 INFO L306 CDTParser]: Found 1 translation units. [2020-07-29 01:30:21,403 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-restricted-15/NO_03.c [2020-07-29 01:30:21,410 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b3931db2/2081c30ebbd1457386713474d8f71bd6/FLAG85a38f2b2 [2020-07-29 01:30:21,791 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b3931db2/2081c30ebbd1457386713474d8f71bd6 [2020-07-29 01:30:21,796 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-29 01:30:21,800 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-07-29 01:30:21,802 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-29 01:30:21,802 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-29 01:30:21,806 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-29 01:30:21,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.07 01:30:21" (1/1) ... [2020-07-29 01:30:21,811 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e259ff1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:21, skipping insertion in model container [2020-07-29 01:30:21,812 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.07 01:30:21" (1/1) ... [2020-07-29 01:30:21,821 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-29 01:30:21,837 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-29 01:30:21,993 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-29 01:30:21,998 INFO L203 MainTranslator]: Completed pre-run [2020-07-29 01:30:22,011 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-29 01:30:22,026 INFO L208 MainTranslator]: Completed translation [2020-07-29 01:30:22,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22 WrapperNode [2020-07-29 01:30:22,027 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-29 01:30:22,029 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-07-29 01:30:22,029 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-07-29 01:30:22,029 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-07-29 01:30:22,040 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,045 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,073 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-07-29 01:30:22,073 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-29 01:30:22,073 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-29 01:30:22,073 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-29 01:30:22,148 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,148 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,149 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,149 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,151 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,156 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,157 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (1/1) ... [2020-07-29 01:30:22,158 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-29 01:30:22,159 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-29 01:30:22,159 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-29 01:30:22,159 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-29 01:30:22,160 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (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 [2020-07-29 01:30:22,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-29 01:30:22,230 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-29 01:30:22,422 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-29 01:30:22,422 INFO L295 CfgBuilder]: Removed 6 assume(true) statements. [2020-07-29 01:30:22,426 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.07 01:30:22 BoogieIcfgContainer [2020-07-29 01:30:22,426 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-29 01:30:22,427 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-07-29 01:30:22,428 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-07-29 01:30:22,432 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-07-29 01:30:22,434 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-07-29 01:30:22,434 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 29.07 01:30:21" (1/3) ... [2020-07-29 01:30:22,436 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@7d9e05ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 29.07 01:30:22, skipping insertion in model container [2020-07-29 01:30:22,436 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-07-29 01:30:22,436 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.07 01:30:22" (2/3) ... [2020-07-29 01:30:22,437 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@7d9e05ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 29.07 01:30:22, skipping insertion in model container [2020-07-29 01:30:22,437 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-07-29 01:30:22,437 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.07 01:30:22" (3/3) ... [2020-07-29 01:30:22,439 INFO L371 chiAutomizerObserver]: Analyzing ICFG NO_03.c [2020-07-29 01:30:22,496 INFO L356 BuchiCegarLoop]: Interprodecural is true [2020-07-29 01:30:22,496 INFO L357 BuchiCegarLoop]: Hoare is false [2020-07-29 01:30:22,496 INFO L358 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-07-29 01:30:22,497 INFO L359 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-29 01:30:22,497 INFO L360 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-29 01:30:22,497 INFO L361 BuchiCegarLoop]: Difference is false [2020-07-29 01:30:22,497 INFO L362 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-29 01:30:22,498 INFO L365 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-07-29 01:30:22,514 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 8 states. [2020-07-29 01:30:22,553 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2020-07-29 01:30:22,553 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-07-29 01:30:22,554 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-07-29 01:30:22,563 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1] [2020-07-29 01:30:22,563 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-07-29 01:30:22,563 INFO L424 BuchiCegarLoop]: ======== Iteration 1============ [2020-07-29 01:30:22,564 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 8 states. [2020-07-29 01:30:22,567 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2020-07-29 01:30:22,567 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-07-29 01:30:22,568 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-07-29 01:30:22,568 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1] [2020-07-29 01:30:22,568 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-07-29 01:30:22,580 INFO L794 eck$LassoCheckResult]: Stem: 4#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_~i~0, main_~j~0;havoc main_~i~0;havoc main_~j~0;main_~i~0 := 0; 8#L10-2true [2020-07-29 01:30:22,580 INFO L796 eck$LassoCheckResult]: Loop: 8#L10-2true assume !!(main_~i~0 < 100);main_~j~0 := 0; 3#L12-2true assume !(main_~j~0 < 1); 10#L12-3true main_~i~0 := main_~i~0; 8#L10-2true [2020-07-29 01:30:22,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-29 01:30:22,588 INFO L82 PathProgramCache]: Analyzing trace with hash 32, now seen corresponding path program 1 times [2020-07-29 01:30:22,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-29 01:30:22,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787192894] [2020-07-29 01:30:22,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-29 01:30:22,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-29 01:30:22,682 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-29 01:30:22,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-29 01:30:22,686 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-29 01:30:22,707 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-29 01:30:22,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-29 01:30:22,709 INFO L82 PathProgramCache]: Analyzing trace with hash 39951, now seen corresponding path program 1 times [2020-07-29 01:30:22,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-29 01:30:22,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855551443] [2020-07-29 01:30:22,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-29 01:30:22,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-29 01:30:22,824 INFO L280 TraceCheckUtils]: 0: Hoare triple {14#true} assume !!(main_~i~0 < 100);main_~j~0 := 0; {16#(<= ULTIMATE.start_main_~j~0 0)} is VALID [2020-07-29 01:30:22,826 INFO L280 TraceCheckUtils]: 1: Hoare triple {16#(<= ULTIMATE.start_main_~j~0 0)} assume !(main_~j~0 < 1); {15#false} is VALID [2020-07-29 01:30:22,827 INFO L280 TraceCheckUtils]: 2: Hoare triple {15#false} main_~i~0 := main_~i~0; {15#false} is VALID [2020-07-29 01:30:22,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-29 01:30:22,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855551443] [2020-07-29 01:30:22,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-29 01:30:22,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-29 01:30:22,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946598725] [2020-07-29 01:30:22,836 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-07-29 01:30:22,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-29 01:30:22,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-29 01:30:22,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-29 01:30:22,852 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 3 states. [2020-07-29 01:30:22,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-29 01:30:22,909 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2020-07-29 01:30:22,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-29 01:30:22,910 INFO L86 InductivityCheck]: Starting indutivity check of a Floyd-Hoare automaton with 3 states. [2020-07-29 01:30:22,921 INFO L119 InductivityCheck]: Floyd-Hoare automaton has 3 edges. 3 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. [2020-07-29 01:30:22,923 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 9 states and 10 transitions. [2020-07-29 01:30:22,925 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 4 [2020-07-29 01:30:22,931 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 9 states to 5 states and 6 transitions. [2020-07-29 01:30:22,933 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 5 [2020-07-29 01:30:22,933 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 5 [2020-07-29 01:30:22,934 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 6 transitions. [2020-07-29 01:30:22,934 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-07-29 01:30:22,935 INFO L688 BuchiCegarLoop]: Abstraction has 5 states and 6 transitions. [2020-07-29 01:30:22,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states and 6 transitions. [2020-07-29 01:30:22,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2020-07-29 01:30:22,958 INFO L214 AbstractMinimizeNwa]: Start testing correctness of minimizeSevpa [2020-07-29 01:30:22,959 INFO L82 GeneralOperation]: Start isEquivalent. First operand 5 states and 6 transitions. Second operand 5 states. [2020-07-29 01:30:22,959 INFO L74 IsIncluded]: Start isIncluded. First operand 5 states and 6 transitions. Second operand 5 states. [2020-07-29 01:30:22,961 INFO L87 Difference]: Start difference. First operand 5 states and 6 transitions. Second operand 5 states. [2020-07-29 01:30:22,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-29 01:30:22,962 INFO L93 Difference]: Finished difference Result 5 states and 6 transitions. [2020-07-29 01:30:22,963 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 6 transitions. [2020-07-29 01:30:22,963 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-29 01:30:22,964 INFO L83 IsIncluded]: Finished isIncluded. Language is included [2020-07-29 01:30:22,964 INFO L74 IsIncluded]: Start isIncluded. First operand 5 states. Second operand 5 states and 6 transitions. [2020-07-29 01:30:22,964 INFO L87 Difference]: Start difference. First operand 5 states. Second operand 5 states and 6 transitions. [2020-07-29 01:30:22,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-29 01:30:22,965 INFO L93 Difference]: Finished difference Result 5 states and 6 transitions. [2020-07-29 01:30:22,965 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 6 transitions. [2020-07-29 01:30:22,966 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-29 01:30:22,966 INFO L83 IsIncluded]: Finished isIncluded. Language is included [2020-07-29 01:30:22,966 INFO L88 GeneralOperation]: Finished isEquivalent. [2020-07-29 01:30:22,966 INFO L221 AbstractMinimizeNwa]: Finished testing correctness of minimizeSevpa [2020-07-29 01:30:22,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-07-29 01:30:22,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 6 transitions. [2020-07-29 01:30:22,969 INFO L711 BuchiCegarLoop]: Abstraction has 5 states and 6 transitions. [2020-07-29 01:30:22,970 INFO L591 BuchiCegarLoop]: Abstraction has 5 states and 6 transitions. [2020-07-29 01:30:22,970 INFO L424 BuchiCegarLoop]: ======== Iteration 2============ [2020-07-29 01:30:22,970 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 5 states and 6 transitions. [2020-07-29 01:30:22,971 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 4 [2020-07-29 01:30:22,971 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-07-29 01:30:22,971 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-07-29 01:30:22,971 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1] [2020-07-29 01:30:22,971 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1] [2020-07-29 01:30:22,972 INFO L794 eck$LassoCheckResult]: Stem: 28#ULTIMATE.startENTRY havoc main_#res;havoc main_~i~0, main_~j~0;havoc main_~i~0;havoc main_~j~0;main_~i~0 := 0; 29#L10-2 [2020-07-29 01:30:22,972 INFO L796 eck$LassoCheckResult]: Loop: 29#L10-2 assume !!(main_~i~0 < 100);main_~j~0 := 0; 26#L12-2 assume !!(main_~j~0 < 1);main_~j~0 := 1 + main_~j~0; 27#L12-2 assume !(main_~j~0 < 1); 30#L12-3 main_~i~0 := main_~i~0; 29#L10-2 [2020-07-29 01:30:22,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-29 01:30:22,972 INFO L82 PathProgramCache]: Analyzing trace with hash 32, now seen corresponding path program 2 times [2020-07-29 01:30:22,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-29 01:30:22,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754516967] [2020-07-29 01:30:22,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-29 01:30:22,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-29 01:30:22,981 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-29 01:30:22,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-29 01:30:22,983 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-29 01:30:22,984 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-29 01:30:22,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-29 01:30:22,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1240240, now seen corresponding path program 1 times [2020-07-29 01:30:22,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-29 01:30:22,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617352046] [2020-07-29 01:30:22,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-29 01:30:23,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-29 01:30:23,003 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-29 01:30:23,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-29 01:30:23,008 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-29 01:30:23,009 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-29 01:30:23,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-29 01:30:23,010 INFO L82 PathProgramCache]: Analyzing trace with hash 29869391, now seen corresponding path program 1 times [2020-07-29 01:30:23,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-29 01:30:23,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409120348] [2020-07-29 01:30:23,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-29 01:30:23,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-29 01:30:23,017 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-29 01:30:23,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-29 01:30:23,022 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-29 01:30:23,024 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-29 01:30:23,159 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 29.07 01:30:23 BoogieIcfgContainer [2020-07-29 01:30:23,159 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-07-29 01:30:23,159 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-07-29 01:30:23,159 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-07-29 01:30:23,160 INFO L275 PluginConnector]: Witness Printer initialized [2020-07-29 01:30:23,160 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.07 01:30:22" (3/4) ... [2020-07-29 01:30:23,164 INFO L134 WitnessPrinter]: Generating witness for non-termination counterexample [2020-07-29 01:30:23,208 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-07-29 01:30:23,208 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-07-29 01:30:23,211 INFO L168 Benchmark]: Toolchain (without parser) took 1412.35 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 957.6 MB in the beginning and 1.1 GB in the end (delta: -120.6 MB). Peak memory consumption was 20.9 MB. Max. memory is 11.5 GB. [2020-07-29 01:30:23,211 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 981.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2020-07-29 01:30:23,212 INFO L168 Benchmark]: CACSL2BoogieTranslator took 225.76 ms. Allocated memory is still 1.0 GB. Free memory was 957.6 MB in the beginning and 945.5 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB. [2020-07-29 01:30:23,213 INFO L168 Benchmark]: Boogie Procedure Inliner took 43.79 ms. Allocated memory is still 1.0 GB. Free memory is still 945.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2020-07-29 01:30:23,214 INFO L168 Benchmark]: Boogie Preprocessor took 85.14 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 945.5 MB in the beginning and 1.1 GB in the end (delta: -185.7 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. [2020-07-29 01:30:23,214 INFO L168 Benchmark]: RCFGBuilder took 268.05 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 11.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 11.5 GB. [2020-07-29 01:30:23,215 INFO L168 Benchmark]: BuchiAutomizer took 731.68 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 41.8 MB). Peak memory consumption was 41.8 MB. Max. memory is 11.5 GB. [2020-07-29 01:30:23,216 INFO L168 Benchmark]: Witness Printer took 48.85 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2020-07-29 01:30:23,219 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - AssertionsEnabledResult: Assertions are enabled Assertions are enabled - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 981.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 225.76 ms. Allocated memory is still 1.0 GB. Free memory was 957.6 MB in the beginning and 945.5 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 43.79 ms. Allocated memory is still 1.0 GB. Free memory is still 945.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 85.14 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 945.5 MB in the beginning and 1.1 GB in the end (delta: -185.7 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. * RCFGBuilder took 268.05 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 11.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 11.5 GB. * BuchiAutomizer took 731.68 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 41.8 MB). Peak memory consumption was 41.8 MB. Max. memory is 11.5 GB. * Witness Printer took 48.85 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 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 5 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 0.6s and 2 iterations. TraceHistogramMax:1. Analysis of lassos took 0.4s. 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 5 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, 5 SDs, 0 SdLazy, 4 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time LassoAnalysisResults: nont1 unkn0 SFLI1 SFLT0 conc0 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: 10]: 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 {\result=0, i=0, j=1} - StatisticsResult: NonterminationArgumentStatistics Fixpoint - NonterminatingLassoResult [Line: 10]: Nonterminating execution Found a nonterminating execution for the following lasso shaped sequence of statements. Stem: [L6] int i; [L7] int j; [L8] i = 0 Loop: [L10] COND TRUE i < 100 [L11] j = 0 [L12] COND TRUE j < 1 [L13] j = j+1 [L12] COND FALSE !(j < 1) [L15] i = i+0 End of lasso representation. RESULT: Ultimate proved your program to be incorrect! Received shutdown request...