./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 9a8b2e8d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.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 0.1.25-9a8b2e8 [2020-10-20 06:32:52,394 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-20 06:32:52,396 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-20 06:32:52,438 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-20 06:32:52,439 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-20 06:32:52,450 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-20 06:32:52,453 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-20 06:32:52,455 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-20 06:32:52,465 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-20 06:32:52,467 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-20 06:32:52,468 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-20 06:32:52,471 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-20 06:32:52,471 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-20 06:32:52,474 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-20 06:32:52,477 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-20 06:32:52,479 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-20 06:32:52,480 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-20 06:32:52,482 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-20 06:32:52,483 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-20 06:32:52,490 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-20 06:32:52,492 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-20 06:32:52,494 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-20 06:32:52,495 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-20 06:32:52,497 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-20 06:32:52,499 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-20 06:32:52,500 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-20 06:32:52,500 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-20 06:32:52,502 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-20 06:32:52,503 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-20 06:32:52,503 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-20 06:32:52,504 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-20 06:32:52,504 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-20 06:32:52,505 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-20 06:32:52,506 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-20 06:32:52,507 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-20 06:32:52,508 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-20 06:32:52,508 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-20 06:32:52,508 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-20 06:32:52,509 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-20 06:32:52,510 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-20 06:32:52,512 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-20 06:32:52,513 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-10-20 06:32:52,559 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-20 06:32:52,559 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-20 06:32:52,561 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-20 06:32:52,562 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-20 06:32:52,562 INFO L138 SettingsManager]: * Use SBE=true [2020-10-20 06:32:52,562 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-10-20 06:32:52,562 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-10-20 06:32:52,563 INFO L138 SettingsManager]: * Use old map elimination=false [2020-10-20 06:32:52,563 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-10-20 06:32:52,563 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-10-20 06:32:52,564 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-10-20 06:32:52,565 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-20 06:32:52,565 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-10-20 06:32:52,565 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-20 06:32:52,565 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-20 06:32:52,566 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-10-20 06:32:52,566 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-10-20 06:32:52,566 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-10-20 06:32:52,566 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-20 06:32:52,567 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-10-20 06:32:52,567 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-20 06:32:52,567 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-10-20 06:32:52,567 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-20 06:32:52,568 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-20 06:32:52,568 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-10-20 06:32:52,568 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-20 06:32:52,568 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-20 06:32:52,569 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-20 06:32:52,569 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-10-20 06:32:52,570 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-10-20 06:32:52,571 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 [2020-10-20 06:32:52,772 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 06:32:52,789 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 06:32:52,792 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 06:32:52,794 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 06:32:52,794 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 06:32:52,795 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-crafted/NestedRecursion_1a-2.c [2020-10-20 06:32:52,868 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/485a898ba/5a7672db61fd45c89c43d28cc73c1355/FLAG77af6606b [2020-10-20 06:32:53,308 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 06:32:53,309 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-crafted/NestedRecursion_1a-2.c [2020-10-20 06:32:53,314 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/485a898ba/5a7672db61fd45c89c43d28cc73c1355/FLAG77af6606b [2020-10-20 06:32:53,715 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/485a898ba/5a7672db61fd45c89c43d28cc73c1355 [2020-10-20 06:32:53,719 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 06:32:53,725 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 06:32:53,726 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 06:32:53,726 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 06:32:53,730 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 06:32:53,730 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:32:53" (1/1) ... [2020-10-20 06:32:53,733 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ccf9cf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:53, skipping insertion in model container [2020-10-20 06:32:53,734 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:32:53" (1/1) ... [2020-10-20 06:32:53,741 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 06:32:53,753 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 06:32:53,968 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 06:32:53,972 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 06:32:53,991 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 06:32:54,007 INFO L208 MainTranslator]: Completed translation [2020-10-20 06:32:54,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54 WrapperNode [2020-10-20 06:32:54,008 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 06:32:54,010 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 06:32:54,010 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 06:32:54,010 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 06:32:54,019 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,023 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,040 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 06:32:54,040 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 06:32:54,040 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 06:32:54,040 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 06:32:54,047 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,048 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,048 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,050 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,052 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,052 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (1/1) ... [2020-10-20 06:32:54,054 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 06:32:54,054 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 06:32:54,054 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 06:32:54,054 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 06:32:54,055 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (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 [2020-10-20 06:32:54,109 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-10-20 06:32:54,109 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-10-20 06:32:54,109 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-10-20 06:32:54,109 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-10-20 06:32:54,110 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 06:32:54,110 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 06:32:54,281 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 06:32:54,282 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-10-20 06:32:54,283 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:32:54 BoogieIcfgContainer [2020-10-20 06:32:54,284 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 06:32:54,285 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-10-20 06:32:54,285 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-10-20 06:32:54,288 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-10-20 06:32:54,289 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:32:54,289 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 20.10 06:32:53" (1/3) ... [2020-10-20 06:32:54,291 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@45b6b1d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 20.10 06:32:54, skipping insertion in model container [2020-10-20 06:32:54,291 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:32:54,291 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:54" (2/3) ... [2020-10-20 06:32:54,291 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@45b6b1d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 20.10 06:32:54, skipping insertion in model container [2020-10-20 06:32:54,292 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:32:54,292 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:32:54" (3/3) ... [2020-10-20 06:32:54,294 INFO L373 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1a-2.c [2020-10-20 06:32:54,360 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-10-20 06:32:54,360 INFO L360 BuchiCegarLoop]: Hoare is false [2020-10-20 06:32:54,360 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-10-20 06:32:54,360 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 06:32:54,361 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 06:32:54,361 INFO L364 BuchiCegarLoop]: Difference is false [2020-10-20 06:32:54,361 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 06:32:54,361 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-10-20 06:32:54,385 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 22 states. [2020-10-20 06:32:54,415 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:54,416 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:32:54,416 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:32:54,427 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1] [2020-10-20 06:32:54,427 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:32:54,427 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-10-20 06:32:54,428 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 22 states. [2020-10-20 06:32:54,431 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:54,431 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:32:54,431 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:32:54,432 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1] [2020-10-20 06:32:54,432 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:32:54,442 INFO L794 eck$LassoCheckResult]: Stem: 16#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 3#L26true assume !!(main_~x~0 <= 2147483646); 6#L27true call main_#t~ret6 := rec2(main_~x~0);< 5#rec2ENTRYtrue [2020-10-20 06:32:54,443 INFO L796 eck$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 [2020-10-20 06:32:54,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:54,450 INFO L82 PathProgramCache]: Analyzing trace with hash 49827, now seen corresponding path program 1 times [2020-10-20 06:32:54,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:54,462 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98914332] [2020-10-20 06:32:54,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:54,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:54,551 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:54,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:54,556 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:54,573 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:54,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:54,581 INFO L82 PathProgramCache]: Analyzing trace with hash -959692825, now seen corresponding path program 1 times [2020-10-20 06:32:54,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:54,582 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455080980] [2020-10-20 06:32:54,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:54,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:32:54,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:32:54,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:32:54,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:32:54,695 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455080980] [2020-10-20 06:32:54,695 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 06:32:54,696 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-20 06:32:54,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627601891] [2020-10-20 06:32:54,707 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-10-20 06:32:54,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:32:54,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-20 06:32:54,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-20 06:32:54,723 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2020-10-20 06:32:54,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:32:54,814 INFO L93 Difference]: Finished difference Result 26 states and 35 transitions. [2020-10-20 06:32:54,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-20 06:32:54,817 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 26 states and 35 transitions. [2020-10-20 06:32:54,821 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:54,828 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 26 states to 17 states and 23 transitions. [2020-10-20 06:32:54,829 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 17 [2020-10-20 06:32:54,829 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 17 [2020-10-20 06:32:54,830 INFO L73 IsDeterministic]: Start isDeterministic. Operand 17 states and 23 transitions. [2020-10-20 06:32:54,832 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-10-20 06:32:54,832 INFO L691 BuchiCegarLoop]: Abstraction has 17 states and 23 transitions. [2020-10-20 06:32:54,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states and 23 transitions. [2020-10-20 06:32:54,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-10-20 06:32:54,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-20 06:32:54,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 23 transitions. [2020-10-20 06:32:54,871 INFO L714 BuchiCegarLoop]: Abstraction has 17 states and 23 transitions. [2020-10-20 06:32:54,872 INFO L594 BuchiCegarLoop]: Abstraction has 17 states and 23 transitions. [2020-10-20 06:32:54,872 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-10-20 06:32:54,872 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 17 states and 23 transitions. [2020-10-20 06:32:54,873 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:54,874 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:32:54,874 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:32:54,875 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1] [2020-10-20 06:32:54,875 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:32:54,876 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 [2020-10-20 06:32:54,876 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~ret1;havoc #t~ret2; 79#rec1FINAL assume true; 81#rec1EXIT >#38#return; 68#L20-1 call #t~ret4 := rec2(#t~ret3);< 67#rec2ENTRY [2020-10-20 06:32:54,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:54,877 INFO L82 PathProgramCache]: Analyzing trace with hash 49827, now seen corresponding path program 2 times [2020-10-20 06:32:54,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:54,878 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799003740] [2020-10-20 06:32:54,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:54,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:54,882 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:54,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:54,885 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:54,886 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:54,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:54,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1440672699, now seen corresponding path program 1 times [2020-10-20 06:32:54,887 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:54,888 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142887928] [2020-10-20 06:32:54,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:54,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:54,905 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:54,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:54,920 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:54,925 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:54,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:54,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1765119907, now seen corresponding path program 1 times [2020-10-20 06:32:54,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:54,926 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550558334] [2020-10-20 06:32:54,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:54,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:54,949 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:54,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:54,974 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:54,988 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:55,405 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 20.10 06:32:55 BoogieIcfgContainer [2020-10-20 06:32:55,410 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-10-20 06:32:55,411 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 06:32:55,411 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 06:32:55,411 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 06:32:55,412 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:32:54" (3/4) ... [2020-10-20 06:32:55,415 INFO L134 WitnessPrinter]: Generating witness for non-termination counterexample [2020-10-20 06:32:55,463 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-20 06:32:55,463 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 06:32:55,465 INFO L168 Benchmark]: Toolchain (without parser) took 1744.40 ms. Allocated memory was 35.1 MB in the beginning and 49.8 MB in the end (delta: 14.7 MB). Free memory was 12.5 MB in the beginning and 29.6 MB in the end (delta: -17.1 MB). There was no memory consumed. Max. memory is 14.3 GB. [2020-10-20 06:32:55,466 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 34.1 MB. Free memory was 19.3 MB in the beginning and 19.2 MB in the end (delta: 29.8 kB). Peak memory consumption was 29.8 kB. Max. memory is 14.3 GB. [2020-10-20 06:32:55,467 INFO L168 Benchmark]: CACSL2BoogieTranslator took 282.76 ms. Allocated memory was 35.1 MB in the beginning and 43.5 MB in the end (delta: 8.4 MB). Free memory was 11.6 MB in the beginning and 25.1 MB in the end (delta: -13.5 MB). Peak memory consumption was 10.7 MB. Max. memory is 14.3 GB. [2020-10-20 06:32:55,468 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.22 ms. Allocated memory is still 43.5 MB. Free memory was 25.1 MB in the beginning and 23.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.5 MB. Max. memory is 14.3 GB. [2020-10-20 06:32:55,469 INFO L168 Benchmark]: Boogie Preprocessor took 13.51 ms. Allocated memory is still 43.5 MB. Free memory was 23.7 MB in the beginning and 22.5 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.2 MB. Max. memory is 14.3 GB. [2020-10-20 06:32:55,470 INFO L168 Benchmark]: RCFGBuilder took 229.84 ms. Allocated memory was 43.5 MB in the beginning and 46.1 MB in the end (delta: 2.6 MB). Free memory was 22.5 MB in the beginning and 24.3 MB in the end (delta: -1.8 MB). Peak memory consumption was 12.1 MB. Max. memory is 14.3 GB. [2020-10-20 06:32:55,470 INFO L168 Benchmark]: BuchiAutomizer took 1126.01 ms. Allocated memory was 46.1 MB in the beginning and 49.8 MB in the end (delta: 3.7 MB). Free memory was 24.1 MB in the beginning and 31.6 MB in the end (delta: -7.5 MB). Peak memory consumption was 17.2 MB. Max. memory is 14.3 GB. [2020-10-20 06:32:55,471 INFO L168 Benchmark]: Witness Printer took 52.18 ms. Allocated memory is still 49.8 MB. Free memory was 31.6 MB in the beginning and 29.6 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 14.3 GB. [2020-10-20 06:32:55,476 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 34.1 MB. Free memory was 19.3 MB in the beginning and 19.2 MB in the end (delta: 29.8 kB). Peak memory consumption was 29.8 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 282.76 ms. Allocated memory was 35.1 MB in the beginning and 43.5 MB in the end (delta: 8.4 MB). Free memory was 11.6 MB in the beginning and 25.1 MB in the end (delta: -13.5 MB). Peak memory consumption was 10.7 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 30.22 ms. Allocated memory is still 43.5 MB. Free memory was 25.1 MB in the beginning and 23.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.5 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 13.51 ms. Allocated memory is still 43.5 MB. Free memory was 23.7 MB in the beginning and 22.5 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.2 MB. Max. memory is 14.3 GB. * RCFGBuilder took 229.84 ms. Allocated memory was 43.5 MB in the beginning and 46.1 MB in the end (delta: 2.6 MB). Free memory was 22.5 MB in the beginning and 24.3 MB in the end (delta: -1.8 MB). Peak memory consumption was 12.1 MB. Max. memory is 14.3 GB. * BuchiAutomizer took 1126.01 ms. Allocated memory was 46.1 MB in the beginning and 49.8 MB in the end (delta: 3.7 MB). Free memory was 24.1 MB in the beginning and 31.6 MB in the end (delta: -7.5 MB). Peak memory consumption was 17.2 MB. Max. memory is 14.3 GB. * Witness Printer took 52.18 ms. Allocated memory is still 49.8 MB. Free memory was 31.6 MB in the beginning and 29.6 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 14.3 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@4b75c3e5=0, \old(j)=1, \result=0, \result=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@4d71ea59=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@5b23751a=0, x=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@44025561=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...