./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive/McCarthy91-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f470102c Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -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/AutomizerReach.xml -i ../sv-benchmarks/c/recursive/McCarthy91-2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-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(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash edcc597a46f9ad79563531282ca675b8b1d7c4bf ......................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.25-f470102 [2019-11-28 17:28:17,362 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-28 17:28:17,364 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-28 17:28:17,384 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-28 17:28:17,384 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-28 17:28:17,387 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-28 17:28:17,389 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-28 17:28:17,402 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-28 17:28:17,404 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-28 17:28:17,407 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-28 17:28:17,409 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-28 17:28:17,411 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-28 17:28:17,412 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-28 17:28:17,416 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-28 17:28:17,417 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-28 17:28:17,419 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-28 17:28:17,421 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-28 17:28:17,424 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-28 17:28:17,427 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-28 17:28:17,431 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-28 17:28:17,432 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-28 17:28:17,433 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-28 17:28:17,434 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-28 17:28:17,435 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-28 17:28:17,437 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-28 17:28:17,438 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-28 17:28:17,438 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-28 17:28:17,439 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-28 17:28:17,439 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-28 17:28:17,440 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-28 17:28:17,440 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-28 17:28:17,441 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-28 17:28:17,442 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-28 17:28:17,443 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-28 17:28:17,444 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-28 17:28:17,444 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-28 17:28:17,445 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-28 17:28:17,445 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-28 17:28:17,445 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-28 17:28:17,446 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-28 17:28:17,447 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-28 17:28:17,448 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-28 17:28:17,462 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-28 17:28:17,462 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-28 17:28:17,464 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-28 17:28:17,464 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-28 17:28:17,464 INFO L138 SettingsManager]: * Use SBE=true [2019-11-28 17:28:17,465 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-28 17:28:17,465 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-28 17:28:17,465 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-28 17:28:17,465 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-28 17:28:17,466 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-28 17:28:17,466 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-28 17:28:17,466 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-28 17:28:17,467 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-28 17:28:17,467 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-28 17:28:17,467 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-28 17:28:17,468 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-28 17:28:17,468 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-28 17:28:17,468 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-28 17:28:17,469 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-28 17:28:17,469 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-28 17:28:17,469 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-28 17:28:17,469 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-28 17:28:17,470 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-28 17:28:17,470 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-28 17:28:17,470 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-28 17:28:17,471 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-28 17:28:17,471 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-28 17:28:17,471 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-28 17:28:17,472 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-11-28 17:28:17,472 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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(G ! call(__VERIFIER_error())) ) 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 -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> edcc597a46f9ad79563531282ca675b8b1d7c4bf [2019-11-28 17:28:17,754 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-28 17:28:17,768 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-28 17:28:17,771 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-28 17:28:17,773 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-28 17:28:17,773 INFO L275 PluginConnector]: CDTParser initialized [2019-11-28 17:28:17,774 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive/McCarthy91-2.c [2019-11-28 17:28:17,841 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fd3594328/0ad1f8ca273b4c35ba69b11f2332d8ee/FLAG748586978 [2019-11-28 17:28:18,228 INFO L306 CDTParser]: Found 1 translation units. [2019-11-28 17:28:18,229 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/McCarthy91-2.c [2019-11-28 17:28:18,235 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fd3594328/0ad1f8ca273b4c35ba69b11f2332d8ee/FLAG748586978 [2019-11-28 17:28:18,607 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fd3594328/0ad1f8ca273b4c35ba69b11f2332d8ee [2019-11-28 17:28:18,610 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-28 17:28:18,612 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-28 17:28:18,613 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-28 17:28:18,613 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-28 17:28:18,617 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-28 17:28:18,618 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,621 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48b00476 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18, skipping insertion in model container [2019-11-28 17:28:18,621 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,629 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-28 17:28:18,653 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-28 17:28:18,812 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 17:28:18,816 INFO L203 MainTranslator]: Completed pre-run [2019-11-28 17:28:18,832 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 17:28:18,847 INFO L208 MainTranslator]: Completed translation [2019-11-28 17:28:18,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18 WrapperNode [2019-11-28 17:28:18,848 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-28 17:28:18,849 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-28 17:28:18,849 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-28 17:28:18,849 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-28 17:28:18,859 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,864 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,884 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-28 17:28:18,885 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-28 17:28:18,885 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-28 17:28:18,885 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-28 17:28:18,952 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,953 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,954 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,954 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,957 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,960 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,961 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (1/1) ... [2019-11-28 17:28:18,968 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-28 17:28:18,969 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-28 17:28:18,969 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-28 17:28:18,969 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-28 17:28:18,970 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (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 [2019-11-28 17:28:19,042 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-28 17:28:19,042 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-28 17:28:19,043 INFO L130 BoogieDeclarations]: Found specification of procedure f91 [2019-11-28 17:28:19,044 INFO L138 BoogieDeclarations]: Found implementation of procedure f91 [2019-11-28 17:28:19,273 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-28 17:28:19,274 INFO L287 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-28 17:28:19,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:28:19 BoogieIcfgContainer [2019-11-28 17:28:19,276 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-28 17:28:19,277 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-28 17:28:19,278 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-28 17:28:19,282 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-28 17:28:19,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 05:28:18" (1/3) ... [2019-11-28 17:28:19,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ab7d737 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 05:28:19, skipping insertion in model container [2019-11-28 17:28:19,284 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 05:28:18" (2/3) ... [2019-11-28 17:28:19,284 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ab7d737 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 05:28:19, skipping insertion in model container [2019-11-28 17:28:19,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:28:19" (3/3) ... [2019-11-28 17:28:19,287 INFO L109 eAbstractionObserver]: Analyzing ICFG McCarthy91-2.c [2019-11-28 17:28:19,298 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-28 17:28:19,307 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-28 17:28:19,321 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-28 17:28:19,359 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-28 17:28:19,360 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-28 17:28:19,360 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-28 17:28:19,361 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-28 17:28:19,361 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-28 17:28:19,361 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-28 17:28:19,361 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-28 17:28:19,362 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-28 17:28:19,385 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-11-28 17:28:19,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-28 17:28:19,394 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:28:19,395 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:28:19,396 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:28:19,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:28:19,405 INFO L82 PathProgramCache]: Analyzing trace with hash -417462297, now seen corresponding path program 1 times [2019-11-28 17:28:19,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:28:19,417 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422451295] [2019-11-28 17:28:19,417 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:28:19,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:19,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:19,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 17:28:19,905 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422451295] [2019-11-28 17:28:19,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-28 17:28:19,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-28 17:28:19,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637615285] [2019-11-28 17:28:19,916 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-28 17:28:19,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:28:19,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-28 17:28:19,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-11-28 17:28:19,936 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 6 states. [2019-11-28 17:28:20,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:28:20,079 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2019-11-28 17:28:20,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-28 17:28:20,083 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 9 [2019-11-28 17:28:20,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:28:20,099 INFO L225 Difference]: With dead ends: 29 [2019-11-28 17:28:20,099 INFO L226 Difference]: Without dead ends: 16 [2019-11-28 17:28:20,110 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-28 17:28:20,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-28 17:28:20,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-11-28 17:28:20,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-28 17:28:20,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2019-11-28 17:28:20,160 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2019-11-28 17:28:20,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:28:20,161 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2019-11-28 17:28:20,161 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-28 17:28:20,161 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2019-11-28 17:28:20,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-28 17:28:20,164 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 17:28:20,164 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 17:28:20,165 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 17:28:20,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 17:28:20,165 INFO L82 PathProgramCache]: Analyzing trace with hash 2030866466, now seen corresponding path program 1 times [2019-11-28 17:28:20,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 17:28:20,166 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614407685] [2019-11-28 17:28:20,167 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 17:28:20,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:20,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:20,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:20,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:20,478 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-28 17:28:20,478 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614407685] [2019-11-28 17:28:20,479 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014970485] [2019-11-28 17:28:20,479 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:28:20,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 17:28:20,531 INFO L264 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-28 17:28:20,541 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 17:28:20,634 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-28 17:28:20,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 17:28:20,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2019-11-28 17:28:20,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446001611] [2019-11-28 17:28:20,637 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-28 17:28:20,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 17:28:20,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-28 17:28:20,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2019-11-28 17:28:20,639 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 12 states. [2019-11-28 17:28:20,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 17:28:20,851 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2019-11-28 17:28:20,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-28 17:28:20,852 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2019-11-28 17:28:20,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 17:28:20,853 INFO L225 Difference]: With dead ends: 16 [2019-11-28 17:28:20,853 INFO L226 Difference]: Without dead ends: 0 [2019-11-28 17:28:20,858 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2019-11-28 17:28:20,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-11-28 17:28:20,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-11-28 17:28:20,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-11-28 17:28:20,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-11-28 17:28:20,860 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2019-11-28 17:28:20,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 17:28:20,861 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-11-28 17:28:20,861 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-28 17:28:20,862 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-11-28 17:28:20,862 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-11-28 17:28:21,066 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 17:28:21,070 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2019-11-28 17:28:21,121 INFO L246 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2019-11-28 17:28:21,121 INFO L246 CegarLoopResult]: For program point L30(line 30) no Hoare annotation was computed. [2019-11-28 17:28:21,122 INFO L246 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2019-11-28 17:28:21,122 INFO L246 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2019-11-28 17:28:21,122 INFO L246 CegarLoopResult]: For program point L27(lines 27 31) no Hoare annotation was computed. [2019-11-28 17:28:21,122 INFO L249 CegarLoopResult]: At program point L26(line 26) the Hoare annotation is: true [2019-11-28 17:28:21,122 INFO L246 CegarLoopResult]: For program point L26-1(line 26) no Hoare annotation was computed. [2019-11-28 17:28:21,123 INFO L246 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 30) no Hoare annotation was computed. [2019-11-28 17:28:21,123 INFO L249 CegarLoopResult]: At program point L24(lines 24 32) the Hoare annotation is: true [2019-11-28 17:28:21,124 INFO L242 CegarLoopResult]: At program point L19-2(line 19) the Hoare annotation is: (and (= f91_~x |f91_#in~x|) (<= |f91_#t~ret0| 101) (<= f91_~x 100)) [2019-11-28 17:28:21,124 INFO L246 CegarLoopResult]: For program point L16(lines 16 20) no Hoare annotation was computed. [2019-11-28 17:28:21,124 INFO L246 CegarLoopResult]: For program point L19-3(line 19) no Hoare annotation was computed. [2019-11-28 17:28:21,125 INFO L249 CegarLoopResult]: At program point f91ENTRY(lines 15 21) the Hoare annotation is: true [2019-11-28 17:28:21,125 INFO L246 CegarLoopResult]: For program point f91FINAL(lines 15 21) no Hoare annotation was computed. [2019-11-28 17:28:21,125 INFO L242 CegarLoopResult]: At program point L19(line 19) the Hoare annotation is: (and (= f91_~x |f91_#in~x|) (<= f91_~x 100)) [2019-11-28 17:28:21,125 INFO L246 CegarLoopResult]: For program point f91EXIT(lines 15 21) no Hoare annotation was computed. [2019-11-28 17:28:21,126 INFO L246 CegarLoopResult]: For program point L19-1(line 19) no Hoare annotation was computed. [2019-11-28 17:28:21,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 05:28:21 BoogieIcfgContainer [2019-11-28 17:28:21,135 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-28 17:28:21,135 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-28 17:28:21,135 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-28 17:28:21,136 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-28 17:28:21,136 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 05:28:19" (3/4) ... [2019-11-28 17:28:21,139 INFO L137 WitnessPrinter]: Generating witness for correct program [2019-11-28 17:28:21,147 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure f91 [2019-11-28 17:28:21,152 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2019-11-28 17:28:21,153 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2019-11-28 17:28:21,196 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-28 17:28:21,196 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-28 17:28:21,199 INFO L168 Benchmark]: Toolchain (without parser) took 2586.65 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 956.3 MB in the beginning and 1.0 GB in the end (delta: -57.7 MB). Peak memory consumption was 83.9 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:21,200 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:28:21,201 INFO L168 Benchmark]: CACSL2BoogieTranslator took 235.56 ms. Allocated memory is still 1.0 GB. Free memory was 956.3 MB in the beginning and 944.3 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:21,201 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.91 ms. Allocated memory is still 1.0 GB. Free memory is still 944.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 17:28:21,202 INFO L168 Benchmark]: Boogie Preprocessor took 83.20 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 944.3 MB in the beginning and 1.1 GB in the end (delta: -187.2 MB). Peak memory consumption was 9.7 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:21,203 INFO L168 Benchmark]: RCFGBuilder took 307.35 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: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:21,204 INFO L168 Benchmark]: TraceAbstraction took 1857.28 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 98.2 MB). Peak memory consumption was 98.2 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:21,204 INFO L168 Benchmark]: Witness Printer took 61.49 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. [2019-11-28 17:28:21,208 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 235.56 ms. Allocated memory is still 1.0 GB. Free memory was 956.3 MB in the beginning and 944.3 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 35.91 ms. Allocated memory is still 1.0 GB. Free memory is still 944.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 83.20 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 944.3 MB in the beginning and 1.1 GB in the end (delta: -187.2 MB). Peak memory consumption was 9.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 307.35 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: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1857.28 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 98.2 MB). Peak memory consumption was 98.2 MB. Max. memory is 11.5 GB. * Witness Printer took 61.49 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 30]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 1 error locations. Result: SAFE, OverallTime: 1.7s, OverallIterations: 2, TraceHistogramMax: 3, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 19 SDtfs, 16 SDslu, 57 SDs, 0 SdLazy, 137 SolverSat, 14 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 11 PreInvPairs, 13 NumberOfFragments, 20 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 5 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 51 NumberOfCodeBlocks, 51 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 3856 SizeOfPredicates, 5 NumberOfNonLiveVariables, 53 ConjunctsInSsa, 19 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 16/24 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...