./Ultimate.py --spec ../sv-benchmarks/c/properties/termination.prp --file ../sv-benchmarks/c/termination-crafted/NestedRecursion_1a-2.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for termination Using default analysis Version 906a4fb5 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/AutomizerTermination.xml -i ../sv-benchmarks/c/termination-crafted/NestedRecursion_1a-2.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 ce492abcc29ddbc9795671b095b6bfaf5bfc547b ................................................................................................................................................................................................................................................................................................................................................ 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 0.1.25-906a4fb [2020-10-19 18:39:54,518 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-19 18:39:54,520 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-19 18:39:54,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-19 18:39:54,544 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-19 18:39:54,546 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-19 18:39:54,550 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-19 18:39:54,552 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-19 18:39:54,557 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-19 18:39:54,559 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-19 18:39:54,560 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-19 18:39:54,562 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-19 18:39:54,563 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-19 18:39:54,566 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-19 18:39:54,569 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-19 18:39:54,570 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-19 18:39:54,571 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-19 18:39:54,573 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-19 18:39:54,575 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-19 18:39:54,579 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-19 18:39:54,582 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-19 18:39:54,583 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-19 18:39:54,584 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-19 18:39:54,586 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-19 18:39:54,590 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-19 18:39:54,591 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-19 18:39:54,592 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-19 18:39:54,594 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-19 18:39:54,594 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-19 18:39:54,595 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-19 18:39:54,596 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-19 18:39:54,597 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-19 18:39:54,597 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-19 18:39:54,598 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-19 18:39:54,608 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-19 18:39:54,610 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-19 18:39:54,613 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-19 18:39:54,613 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-19 18:39:54,613 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-19 18:39:54,614 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-19 18:39:54,619 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-19 18:39:54,620 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-10-19 18:39:54,661 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-19 18:39:54,662 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-19 18:39:54,664 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-19 18:39:54,664 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-19 18:39:54,664 INFO L138 SettingsManager]: * Use SBE=true [2020-10-19 18:39:54,664 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-10-19 18:39:54,665 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-10-19 18:39:54,665 INFO L138 SettingsManager]: * Use old map elimination=false [2020-10-19 18:39:54,665 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-10-19 18:39:54,665 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-10-19 18:39:54,666 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-10-19 18:39:54,667 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-19 18:39:54,667 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-10-19 18:39:54,668 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-19 18:39:54,668 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-19 18:39:54,668 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-10-19 18:39:54,668 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-10-19 18:39:54,669 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-10-19 18:39:54,669 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-19 18:39:54,669 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-10-19 18:39:54,669 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-19 18:39:54,670 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-10-19 18:39:54,670 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-19 18:39:54,670 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-19 18:39:54,670 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-10-19 18:39:54,671 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-19 18:39:54,671 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-19 18:39:54,671 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-19 18:39:54,671 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-10-19 18:39:54,673 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-10-19 18:39:54,673 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 -> ce492abcc29ddbc9795671b095b6bfaf5bfc547b [2020-10-19 18:39:54,964 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-19 18:39:54,976 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-19 18:39:54,980 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-19 18:39:54,981 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-19 18:39:54,982 INFO L275 PluginConnector]: CDTParser initialized [2020-10-19 18:39:54,983 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-crafted/NestedRecursion_1a-2.c [2020-10-19 18:39:55,049 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/00a4ef590/55d4c73d79be4ca2beeb1c7f44806e61/FLAG277bd5122 [2020-10-19 18:39:55,414 INFO L306 CDTParser]: Found 1 translation units. [2020-10-19 18:39:55,415 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-crafted/NestedRecursion_1a-2.c [2020-10-19 18:39:55,423 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/00a4ef590/55d4c73d79be4ca2beeb1c7f44806e61/FLAG277bd5122 [2020-10-19 18:39:55,791 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/00a4ef590/55d4c73d79be4ca2beeb1c7f44806e61 [2020-10-19 18:39:55,794 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-19 18:39:55,801 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-19 18:39:55,804 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-19 18:39:55,804 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-19 18:39:55,808 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-19 18:39:55,809 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.10 06:39:55" (1/1) ... [2020-10-19 18:39:55,813 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@778cc7e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:55, skipping insertion in model container [2020-10-19 18:39:55,813 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.10 06:39:55" (1/1) ... [2020-10-19 18:39:55,823 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-19 18:39:55,841 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-19 18:39:56,007 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-19 18:39:56,012 INFO L203 MainTranslator]: Completed pre-run [2020-10-19 18:39:56,028 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-19 18:39:56,042 INFO L208 MainTranslator]: Completed translation [2020-10-19 18:39:56,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56 WrapperNode [2020-10-19 18:39:56,043 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-19 18:39:56,044 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-19 18:39:56,044 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-19 18:39:56,044 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-19 18:39:56,053 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,058 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,076 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-19 18:39:56,076 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-19 18:39:56,077 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-19 18:39:56,077 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-19 18:39:56,136 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,137 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,138 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,138 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,140 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,142 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,143 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... [2020-10-19 18:39:56,145 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-19 18:39:56,145 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-19 18:39:56,145 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-19 18:39:56,146 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-19 18:39:56,146 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:39:56,214 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-10-19 18:39:56,215 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-10-19 18:39:56,218 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-10-19 18:39:56,218 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-10-19 18:39:56,218 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-19 18:39:56,218 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-19 18:39:56,376 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-19 18:39:56,377 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-10-19 18:39:56,378 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.10 06:39:56 BoogieIcfgContainer [2020-10-19 18:39:56,379 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-19 18:39:56,379 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-10-19 18:39:56,379 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-10-19 18:39:56,383 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-10-19 18:39:56,384 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-19 18:39:56,384 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 19.10 06:39:55" (1/3) ... [2020-10-19 18:39:56,385 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@39ad1dba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 19.10 06:39:56, skipping insertion in model container [2020-10-19 18:39:56,385 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-19 18:39:56,385 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:56" (2/3) ... [2020-10-19 18:39:56,386 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@39ad1dba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 19.10 06:39:56, skipping insertion in model container [2020-10-19 18:39:56,386 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-19 18:39:56,386 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.10 06:39:56" (3/3) ... [2020-10-19 18:39:56,388 INFO L373 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1a-2.c [2020-10-19 18:39:56,438 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-10-19 18:39:56,438 INFO L360 BuchiCegarLoop]: Hoare is false [2020-10-19 18:39:56,438 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-10-19 18:39:56,439 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-19 18:39:56,439 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-19 18:39:56,439 INFO L364 BuchiCegarLoop]: Difference is false [2020-10-19 18:39:56,439 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-19 18:39:56,440 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-10-19 18:39:56,456 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 22 states. [2020-10-19 18:39:56,489 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:39:56,490 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:39:56,490 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:39:56,506 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1] [2020-10-19 18:39:56,507 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:39:56,507 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-10-19 18:39:56,508 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 22 states. [2020-10-19 18:39:56,512 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:39:56,512 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:39:56,512 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:39:56,513 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1] [2020-10-19 18:39:56,513 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:39:56,536 INFO L794 eck$LassoCheckResult]: Stem: 16#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 3#L26true assume !!(main_~x~0 <= 2147483646); 6#L27true call main_#t~ret6 := rec2(main_~x~0);< 5#rec2ENTRYtrue [2020-10-19 18:39:56,537 INFO L796 eck$LassoCheckResult]: Loop: 5#rec2ENTRYtrue ~j := #in~j; 22#L18true assume !(~j <= 0); 20#L20true call #t~ret3 := rec1(1 + ~j);< 7#rec1ENTRYtrue ~i := #in~i; 12#L12true assume ~i <= 0;#res := 0; 8#rec1FINALtrue assume true; 15#rec1EXITtrue >#38#return; 24#L20-1true call #t~ret4 := rec2(#t~ret3);< 5#rec2ENTRYtrue [2020-10-19 18:39:56,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:56,544 INFO L82 PathProgramCache]: Analyzing trace with hash 49827, now seen corresponding path program 1 times [2020-10-19 18:39:56,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:39:56,556 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112535265] [2020-10-19 18:39:56,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:39:56,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:56,637 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:56,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:56,641 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:56,658 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:39:56,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:56,660 INFO L82 PathProgramCache]: Analyzing trace with hash -959692825, now seen corresponding path program 1 times [2020-10-19 18:39:56,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:39:56,661 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355664818] [2020-10-19 18:39:56,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:39:56,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:39:56,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-19 18:39:56,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:39:56,772 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:39:56,773 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355664818] [2020-10-19 18:39:56,774 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-19 18:39:56,774 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-19 18:39:56,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108326643] [2020-10-19 18:39:56,781 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-10-19 18:39:56,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-19 18:39:56,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-19 18:39:56,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-19 18:39:56,801 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2020-10-19 18:39:56,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-19 18:39:56,893 INFO L93 Difference]: Finished difference Result 26 states and 35 transitions. [2020-10-19 18:39:56,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-19 18:39:56,897 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 26 states and 35 transitions. [2020-10-19 18:39:56,901 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:39:56,908 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 26 states to 17 states and 23 transitions. [2020-10-19 18:39:56,910 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 17 [2020-10-19 18:39:56,910 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 17 [2020-10-19 18:39:56,911 INFO L73 IsDeterministic]: Start isDeterministic. Operand 17 states and 23 transitions. [2020-10-19 18:39:56,913 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-10-19 18:39:56,914 INFO L691 BuchiCegarLoop]: Abstraction has 17 states and 23 transitions. [2020-10-19 18:39:56,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states and 23 transitions. [2020-10-19 18:39:56,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-10-19 18:39:56,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-19 18:39:56,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 23 transitions. [2020-10-19 18:39:56,952 INFO L714 BuchiCegarLoop]: Abstraction has 17 states and 23 transitions. [2020-10-19 18:39:56,952 INFO L594 BuchiCegarLoop]: Abstraction has 17 states and 23 transitions. [2020-10-19 18:39:56,952 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-10-19 18:39:56,953 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 17 states and 23 transitions. [2020-10-19 18:39:56,954 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:39:56,954 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:39:56,954 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:39:56,956 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1] [2020-10-19 18:39:56,956 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:39:56,956 INFO L794 eck$LassoCheckResult]: Stem: 80#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 65#L26 assume !!(main_~x~0 <= 2147483646); 66#L27 call main_#t~ret6 := rec2(main_~x~0);< 67#rec2ENTRY [2020-10-19 18:39:56,957 INFO L796 eck$LassoCheckResult]: Loop: 67#rec2ENTRY ~j := #in~j; 69#L18 assume !(~j <= 0); 74#L20 call #t~ret3 := rec1(1 + ~j);< 70#rec1ENTRY ~i := #in~i; 75#L12 assume !(~i <= 0); 71#L14 call #t~ret0 := rec1(~i - 2);< 70#rec1ENTRY ~i := #in~i; 75#L12 assume ~i <= 0;#res := 0; 76#rec1FINAL assume true; 77#rec1EXIT >#32#return; 72#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 70#rec1ENTRY ~i := #in~i; 75#L12 assume ~i <= 0;#res := 0; 76#rec1FINAL assume true; 77#rec1EXIT >#34#return; 73#L14-2 call #t~ret2 := rec1(#t~ret1);< 70#rec1ENTRY ~i := #in~i; 75#L12 assume ~i <= 0;#res := 0; 76#rec1FINAL assume true; 77#rec1EXIT >#36#return; 78#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 79#rec1FINAL assume true; 81#rec1EXIT >#38#return; 68#L20-1 call #t~ret4 := rec2(#t~ret3);< 67#rec2ENTRY [2020-10-19 18:39:56,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:56,958 INFO L82 PathProgramCache]: Analyzing trace with hash 49827, now seen corresponding path program 2 times [2020-10-19 18:39:56,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:39:56,959 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772114670] [2020-10-19 18:39:56,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:39:56,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:56,963 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:56,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:56,965 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:56,967 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:39:56,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:56,968 INFO L82 PathProgramCache]: Analyzing trace with hash 1440672699, now seen corresponding path program 1 times [2020-10-19 18:39:56,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:39:56,968 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769138858] [2020-10-19 18:39:56,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:39:56,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:56,987 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:57,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:57,012 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:57,016 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:39:57,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:57,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1765119907, now seen corresponding path program 1 times [2020-10-19 18:39:57,018 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:39:57,018 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716627461] [2020-10-19 18:39:57,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:39:57,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:57,033 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:57,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:57,047 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:57,054 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:39:57,461 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 19.10 06:39:57 BoogieIcfgContainer [2020-10-19 18:39:57,462 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-10-19 18:39:57,462 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-19 18:39:57,462 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-19 18:39:57,463 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-19 18:39:57,463 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.10 06:39:56" (3/4) ... [2020-10-19 18:39:57,467 INFO L134 WitnessPrinter]: Generating witness for non-termination counterexample [2020-10-19 18:39:57,514 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-19 18:39:57,515 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-19 18:39:57,518 INFO L168 Benchmark]: Toolchain (without parser) took 1721.38 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.9 MB). Free memory was 958.6 MB in the beginning and 1.0 GB in the end (delta: -83.1 MB). Peak memory consumption was 66.9 MB. Max. memory is 11.5 GB. [2020-10-19 18:39:57,518 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2020-10-19 18:39:57,519 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.40 ms. Allocated memory is still 1.0 GB. Free memory was 958.6 MB in the beginning and 947.9 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2020-10-19 18:39:57,520 INFO L168 Benchmark]: Boogie Procedure Inliner took 32.26 ms. Allocated memory is still 1.0 GB. Free memory is still 947.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2020-10-19 18:39:57,521 INFO L168 Benchmark]: Boogie Preprocessor took 68.45 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.9 MB). Free memory was 947.9 MB in the beginning and 1.1 GB in the end (delta: -198.4 MB). Peak memory consumption was 15.2 MB. Max. memory is 11.5 GB. [2020-10-19 18:39:57,521 INFO L168 Benchmark]: RCFGBuilder took 233.54 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: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 11.5 GB. [2020-10-19 18:39:57,522 INFO L168 Benchmark]: BuchiAutomizer took 1082.65 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: 86.3 MB). Peak memory consumption was 86.3 MB. Max. memory is 11.5 GB. [2020-10-19 18:39:57,526 INFO L168 Benchmark]: Witness Printer took 53.05 ms. Allocated memory is still 1.2 GB. Free memory is still 1.0 GB. There was no memory consumed. Max. memory is 11.5 GB. [2020-10-19 18:39:57,530 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 239.40 ms. Allocated memory is still 1.0 GB. Free memory was 958.6 MB in the beginning and 947.9 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 32.26 ms. Allocated memory is still 1.0 GB. Free memory is still 947.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 68.45 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.9 MB). Free memory was 947.9 MB in the beginning and 1.1 GB in the end (delta: -198.4 MB). Peak memory consumption was 15.2 MB. Max. memory is 11.5 GB. * RCFGBuilder took 233.54 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: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 11.5 GB. * BuchiAutomizer took 1082.65 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: 86.3 MB). Peak memory consumption was 86.3 MB. Max. memory is 11.5 GB. * Witness Printer took 53.05 ms. Allocated memory is still 1.2 GB. Free memory is still 1.0 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 5 locations. The remainder module has 17 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 1.0s and 2 iterations. TraceHistogramMax:4. Analysis of lassos took 0.7s. 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 17 states and ocurred in iteration 1. Nontrivial modules had stage [0, 0, 0, 0, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 0/0 HoareTripleCheckerStatistics: 25 SDtfs, 7 SDslu, 53 SDs, 0 SdLazy, 31 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: 17]: 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 {NULL=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@6df9bfcc=0, \old(j)=1, \result=0, \result=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@72784ce3=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@71e0b9d6=0, x=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@119fc9f2=0, j=0} - StatisticsResult: NonterminationArgumentStatistics Fixpoint - NonterminatingLassoResult [Line: 17]: Nonterminating execution Found a nonterminating execution for the following lasso shaped sequence of statements. Stem: [L24] int x = __VERIFIER_nondet_int(); [L26] COND FALSE !(!(x<=2147483646)) [L27] CALL rec2(x) Loop: [L18] COND FALSE !(j <= 0) [L20] CALL, EXPR rec1(j+1) [L12] COND FALSE !(i <= 0) [L14] CALL, EXPR rec1(i-2) [L12] COND TRUE i <= 0 [L13] return 0; [L14] RET, EXPR rec1(i-2) [L14] CALL, EXPR rec1(rec1(i-2) - 1) [L12] COND TRUE i <= 0 [L13] return 0; [L14] RET, EXPR rec1(rec1(i-2) - 1) [L14] CALL, EXPR rec1(rec1(rec1(i-2) - 1)) [L12] COND TRUE i <= 0 [L13] return 0; [L14] RET, EXPR rec1(rec1(rec1(i-2) - 1)) [L14] return rec1(rec1(rec1(i-2) - 1)) + 1; [L20] RET, EXPR rec1(j+1) [L20] CALL rec2(rec1(j+1)) End of lasso representation. RESULT: Ultimate proved your program to be incorrect! Received shutdown request...