/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:57:02,799 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:57:02,803 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:57:02,847 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:57:02,847 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:57:02,858 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:57:02,861 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:57:02,865 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:57:02,868 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:57:02,872 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:57:02,873 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:57:02,874 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:57:02,874 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:57:02,878 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:57:02,881 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:57:02,882 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:57:02,884 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:57:02,885 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:57:02,886 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:57:02,895 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:57:02,898 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:57:02,899 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:57:02,900 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:57:02,901 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:57:02,903 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:57:02,903 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:57:02,903 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:57:02,904 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:57:02,905 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:57:02,906 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 18:57:02,906 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:57:02,907 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:57:02,907 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:57:02,908 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:57:02,909 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:57:02,909 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:57:02,910 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:57:02,910 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:57:02,910 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:57:02,911 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:57:02,912 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:57:02,913 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:57:02,936 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:57:02,936 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:57:02,938 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:57:02,938 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:57:02,938 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:57:02,938 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:57:02,939 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:57:02,939 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:57:02,939 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:57:02,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:57:02,939 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:57:02,939 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:57:02,940 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:57:02,940 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:57:02,940 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:57:02,940 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:57:02,940 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:57:02,941 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:57:02,941 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:57:02,941 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:57:02,941 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:57:02,941 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:57:02,942 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:57:02,942 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:57:02,942 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:57:02,942 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:57:02,943 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:57:02,943 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:57:02,943 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:57:02,943 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 18:57:03,274 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:57:03,287 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:57:03,291 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:57:03,293 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:57:03,293 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:57:03,294 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2020-08-21 18:57:03,379 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f49cf33f2/087a4437647b4a39b13c9876c8115f60/FLAG3ed31d312 [2020-08-21 18:57:03,875 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:57:03,876 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2020-08-21 18:57:03,883 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f49cf33f2/087a4437647b4a39b13c9876c8115f60/FLAG3ed31d312 [2020-08-21 18:57:04,211 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f49cf33f2/087a4437647b4a39b13c9876c8115f60 [2020-08-21 18:57:04,220 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:57:04,222 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:57:04,223 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:57:04,223 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:57:04,227 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:57:04,228 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,232 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3add5f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04, skipping insertion in model container [2020-08-21 18:57:04,232 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,240 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:57:04,259 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:57:04,456 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:57:04,468 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:57:04,488 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:57:04,507 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:57:04,508 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04 WrapperNode [2020-08-21 18:57:04,508 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:57:04,509 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:57:04,509 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:57:04,509 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:57:04,604 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,606 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,623 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,623 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,637 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,640 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,642 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (1/1) ... [2020-08-21 18:57:04,645 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:57:04,645 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:57:04,645 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:57:04,646 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:57:04,647 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 18:57:04,708 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:57:04,709 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:57:04,710 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 18:57:04,710 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-08-21 18:57:04,711 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2020-08-21 18:57:04,711 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 18:57:04,712 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-08-21 18:57:04,712 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:57:04,713 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 18:57:04,714 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-21 18:57:04,714 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:57:04,714 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 18:57:04,714 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:57:04,715 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 18:57:04,715 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-08-21 18:57:04,716 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 18:57:04,716 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 18:57:04,716 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 18:57:04,716 INFO L130 BoogieDeclarations]: Found specification of procedure max [2020-08-21 18:57:04,716 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 18:57:04,717 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 18:57:04,717 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 18:57:04,717 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-08-21 18:57:04,717 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:57:04,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:57:04,720 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:57:04,720 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 18:57:05,011 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:57:05,012 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:57:05,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:57:05 BoogieIcfgContainer [2020-08-21 18:57:05,018 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:57:05,019 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:57:05,019 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:57:05,024 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:57:05,024 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:57:04" (1/3) ... [2020-08-21 18:57:05,025 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37c86e59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:57:05, skipping insertion in model container [2020-08-21 18:57:05,025 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:04" (2/3) ... [2020-08-21 18:57:05,026 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37c86e59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:57:05, skipping insertion in model container [2020-08-21 18:57:05,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:57:05" (3/3) ... [2020-08-21 18:57:05,029 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2020-08-21 18:57:05,043 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:57:05,053 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:57:05,092 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:57:05,150 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:57:05,150 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:57:05,150 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:57:05,150 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:57:05,151 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:57:05,151 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:57:05,151 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:57:05,151 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:57:05,172 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states. [2020-08-21 18:57:05,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 18:57:05,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:05,181 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:57:05,182 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:05,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:05,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1628582097, now seen corresponding path program 1 times [2020-08-21 18:57:05,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:05,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092267974] [2020-08-21 18:57:05,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:05,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:05,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:05,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 18:57:05,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:57:05,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092267974] [2020-08-21 18:57:05,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:57:05,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-08-21 18:57:05,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037886517] [2020-08-21 18:57:05,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:57:05,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:05,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:57:05,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:57:05,706 INFO L87 Difference]: Start difference. First operand 51 states. Second operand 10 states. [2020-08-21 18:57:06,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:06,513 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-21 18:57:06,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:57:06,515 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-21 18:57:06,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:06,528 INFO L225 Difference]: With dead ends: 93 [2020-08-21 18:57:06,528 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 18:57:06,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:57:06,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 18:57:06,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 18:57:06,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 18:57:06,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2020-08-21 18:57:06,586 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 24 [2020-08-21 18:57:06,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:06,587 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2020-08-21 18:57:06,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:57:06,587 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2020-08-21 18:57:06,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 18:57:06,590 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:06,591 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:57:06,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:57:06,591 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:06,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:06,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1712930862, now seen corresponding path program 1 times [2020-08-21 18:57:06,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:06,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898549357] [2020-08-21 18:57:06,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:06,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:06,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:06,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-08-21 18:57:06,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:57:06,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 18:57:06,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,834 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 18:57:06,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898549357] [2020-08-21 18:57:06,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:57:06,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-21 18:57:06,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048811005] [2020-08-21 18:57:06,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:57:06,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:06,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:57:06,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:57:06,839 INFO L87 Difference]: Start difference. First operand 42 states and 51 transitions. Second operand 11 states. [2020-08-21 18:57:07,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:07,304 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2020-08-21 18:57:07,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:57:07,305 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2020-08-21 18:57:07,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:07,307 INFO L225 Difference]: With dead ends: 59 [2020-08-21 18:57:07,307 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 18:57:07,309 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:57:07,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 18:57:07,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 18:57:07,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 18:57:07,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2020-08-21 18:57:07,322 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 34 [2020-08-21 18:57:07,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:07,322 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2020-08-21 18:57:07,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:57:07,323 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2020-08-21 18:57:07,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 18:57:07,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:07,325 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:57:07,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:57:07,326 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:07,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:07,326 INFO L82 PathProgramCache]: Analyzing trace with hash 27177221, now seen corresponding path program 1 times [2020-08-21 18:57:07,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:07,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708499001] [2020-08-21 18:57:07,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:07,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:57:07,365 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:57:07,366 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:57:07,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:57:07,390 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:57:07 BoogieIcfgContainer [2020-08-21 18:57:07,390 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:57:07,393 INFO L168 Benchmark]: Toolchain (without parser) took 3169.71 ms. Allocated memory was 136.8 MB in the beginning and 252.7 MB in the end (delta: 115.9 MB). Free memory was 99.7 MB in the beginning and 208.6 MB in the end (delta: -108.9 MB). Peak memory consumption was 7.0 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,394 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 136.8 MB. Free memory was 118.4 MB in the beginning and 118.1 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 18:57:07,395 INFO L168 Benchmark]: CACSL2BoogieTranslator took 285.29 ms. Allocated memory is still 136.8 MB. Free memory was 99.5 MB in the beginning and 89.1 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,395 INFO L168 Benchmark]: Boogie Preprocessor took 135.93 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 89.1 MB in the beginning and 177.4 MB in the end (delta: -88.3 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,396 INFO L168 Benchmark]: RCFGBuilder took 372.63 ms. Allocated memory is still 200.3 MB. Free memory was 177.4 MB in the beginning and 156.2 MB in the end (delta: 21.2 MB). Peak memory consumption was 21.2 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,397 INFO L168 Benchmark]: TraceAbstraction took 2371.14 ms. Allocated memory was 200.3 MB in the beginning and 252.7 MB in the end (delta: 52.4 MB). Free memory was 155.5 MB in the beginning and 208.6 MB in the end (delta: -53.1 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 18:57:07,401 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 136.8 MB. Free memory was 118.4 MB in the beginning and 118.1 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 285.29 ms. Allocated memory is still 136.8 MB. Free memory was 99.5 MB in the beginning and 89.1 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 135.93 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 89.1 MB in the beginning and 177.4 MB in the end (delta: -88.3 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 372.63 ms. Allocated memory is still 200.3 MB. Free memory was 177.4 MB in the beginning and 156.2 MB in the end (delta: 21.2 MB). Peak memory consumption was 21.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2371.14 ms. Allocated memory was 200.3 MB in the beginning and 252.7 MB in the end (delta: 52.4 MB). Free memory was 155.5 MB in the beginning and 208.6 MB in the end (delta: -53.1 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L58] CALL, EXPR nondet_tree() [L18] COND FALSE !(__VERIFIER_nondet_bool()) [L21] struct node *n = (struct node *)malloc(sizeof(struct node)); [L22] n->data = __VERIFIER_nondet_int() [L23] CALL, EXPR nondet_tree() [L18] COND TRUE __VERIFIER_nondet_bool() [L19] return 0; [L23] RET, EXPR nondet_tree() [L23] n->left = nondet_tree() [L24] CALL, EXPR nondet_tree() [L18] COND TRUE __VERIFIER_nondet_bool() [L19] return 0; [L24] RET, EXPR nondet_tree() [L24] n->right = nondet_tree() [L25] return n; [L58] RET, EXPR nondet_tree() [L58] CALL task(nondet_tree()) [L53] CALL, EXPR max(n) [L30] COND FALSE !(!n) [L33] EXPR n->left [L33] CALL, EXPR max(n->left) [L30] COND TRUE !n [L31] return -2147483648; [L33] RET, EXPR max(n->left) [L33] int a = max(n->left); [L34] EXPR n->right [L34] CALL, EXPR max(n->right) [L30] COND TRUE !n [L31] return -2147483648; [L34] RET, EXPR max(n->right) [L34] int b = max(n->right); [L35] COND TRUE a >= b [L35] return a; [L53] RET, EXPR max(n) [L53] int a = max(n); [L54] CALL check(n, a) [L41] COND TRUE \read(*n) [L42] EXPR n->data [L42] CALL __VERIFIER_assert(n->data <= a) [L9] COND TRUE !cond [L9] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 8 procedures, 51 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.2s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 79 SDtfs, 141 SDslu, 268 SDs, 0 SdLazy, 527 SolverSat, 103 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 47 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred 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: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 105 NumberOfCodeBlocks, 105 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 56 ConstructedInterpolants, 0 QuantifiedInterpolants, 6559 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 9/9 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...