./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 35987657 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_1.5.800.v20200727-1323.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 d925f1aaa578011e84cee59af464c9f4e53ab5dc54b7f9269f34505d8383253a --- Real Ultimate output --- This is Ultimate 0.2.2-?-3598765 [2022-07-22 01:24:35,320 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-22 01:24:35,323 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-22 01:24:35,372 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-22 01:24:35,372 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-22 01:24:35,374 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-22 01:24:35,377 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-22 01:24:35,381 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-22 01:24:35,384 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-22 01:24:35,388 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-22 01:24:35,389 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-22 01:24:35,394 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-22 01:24:35,394 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-22 01:24:35,396 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-22 01:24:35,398 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-22 01:24:35,400 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-22 01:24:35,401 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-22 01:24:35,402 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-22 01:24:35,404 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-22 01:24:35,409 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-22 01:24:35,411 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-22 01:24:35,412 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-22 01:24:35,413 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-22 01:24:35,414 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-22 01:24:35,416 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-22 01:24:35,422 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-22 01:24:35,423 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-22 01:24:35,423 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-22 01:24:35,424 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-22 01:24:35,425 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-22 01:24:35,427 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-22 01:24:35,427 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-22 01:24:35,430 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-22 01:24:35,430 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-22 01:24:35,432 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-22 01:24:35,433 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-22 01:24:35,433 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-22 01:24:35,433 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-22 01:24:35,434 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-22 01:24:35,434 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-22 01:24:35,435 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-22 01:24:35,436 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-22 01:24:35,441 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2022-07-22 01:24:35,474 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-22 01:24:35,474 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-22 01:24:35,475 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-22 01:24:35,475 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-22 01:24:35,477 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-22 01:24:35,477 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-22 01:24:35,477 INFO L138 SettingsManager]: * Use SBE=true [2022-07-22 01:24:35,477 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2022-07-22 01:24:35,478 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2022-07-22 01:24:35,478 INFO L138 SettingsManager]: * Use old map elimination=false [2022-07-22 01:24:35,479 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2022-07-22 01:24:35,479 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2022-07-22 01:24:35,479 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2022-07-22 01:24:35,479 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-22 01:24:35,480 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-07-22 01:24:35,480 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-22 01:24:35,480 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-22 01:24:35,480 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2022-07-22 01:24:35,481 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2022-07-22 01:24:35,481 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2022-07-22 01:24:35,481 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-22 01:24:35,481 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2022-07-22 01:24:35,481 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-22 01:24:35,482 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2022-07-22 01:24:35,482 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-22 01:24:35,482 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-22 01:24:35,482 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-22 01:24:35,483 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-22 01:24:35,485 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-07-22 01:24:35,485 INFO L138 SettingsManager]: * TransformationType=MODULO_NEIGHBOR WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d925f1aaa578011e84cee59af464c9f4e53ab5dc54b7f9269f34505d8383253a [2022-07-22 01:24:35,813 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-22 01:24:35,843 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-22 01:24:35,846 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-22 01:24:35,847 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-22 01:24:35,848 INFO L275 PluginConnector]: CDTParser initialized [2022-07-22 01:24:35,850 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-crafted/NestedRecursion_1a-2.c [2022-07-22 01:24:35,915 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af505cd12/b1f9e133e7d4418a9ffbf9891269de55/FLAGf071787d4 [2022-07-22 01:24:36,337 INFO L306 CDTParser]: Found 1 translation units. [2022-07-22 01:24:36,338 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-crafted/NestedRecursion_1a-2.c [2022-07-22 01:24:36,343 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af505cd12/b1f9e133e7d4418a9ffbf9891269de55/FLAGf071787d4 [2022-07-22 01:24:36,757 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af505cd12/b1f9e133e7d4418a9ffbf9891269de55 [2022-07-22 01:24:36,764 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-22 01:24:36,765 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-22 01:24:36,767 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-22 01:24:36,767 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-22 01:24:36,770 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-22 01:24:36,771 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:36,772 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69561f44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36, skipping insertion in model container [2022-07-22 01:24:36,772 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:36,778 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-22 01:24:36,789 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-22 01:24:36,894 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-22 01:24:36,897 INFO L203 MainTranslator]: Completed pre-run [2022-07-22 01:24:36,909 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-22 01:24:36,921 INFO L208 MainTranslator]: Completed translation [2022-07-22 01:24:36,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36 WrapperNode [2022-07-22 01:24:36,922 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-22 01:24:36,923 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-22 01:24:36,923 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-22 01:24:36,924 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-22 01:24:36,951 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:36,955 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:36,982 INFO L137 Inliner]: procedures = 6, calls = 8, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 9 [2022-07-22 01:24:36,991 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-22 01:24:36,993 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-22 01:24:36,994 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-22 01:24:36,994 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-22 01:24:37,000 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:37,001 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:37,002 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:37,002 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:37,005 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:37,006 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:37,007 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:37,008 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-22 01:24:37,009 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-22 01:24:37,010 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-22 01:24:37,010 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-22 01:24:37,011 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (1/1) ... [2022-07-22 01:24:37,017 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2022-07-22 01:24:37,026 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-22 01:24:37,045 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2022-07-22 01:24:37,066 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (1)] Waiting until timeout for monitored process [2022-07-22 01:24:37,086 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2022-07-22 01:24:37,086 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2022-07-22 01:24:37,086 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2022-07-22 01:24:37,087 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2022-07-22 01:24:37,087 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-22 01:24:37,087 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-22 01:24:37,134 INFO L234 CfgBuilder]: Building ICFG [2022-07-22 01:24:37,136 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-22 01:24:37,255 INFO L275 CfgBuilder]: Performing block encoding [2022-07-22 01:24:37,261 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-22 01:24:37,261 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-07-22 01:24:37,263 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.07 01:24:37 BoogieIcfgContainer [2022-07-22 01:24:37,263 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-22 01:24:37,264 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2022-07-22 01:24:37,264 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2022-07-22 01:24:37,266 INFO L275 PluginConnector]: BuchiAutomizer initialized [2022-07-22 01:24:37,268 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2022-07-22 01:24:37,268 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 22.07 01:24:36" (1/3) ... [2022-07-22 01:24:37,269 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@57a887a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 22.07 01:24:37, skipping insertion in model container [2022-07-22 01:24:37,270 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2022-07-22 01:24:37,270 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.07 01:24:36" (2/3) ... [2022-07-22 01:24:37,270 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@57a887a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 22.07 01:24:37, skipping insertion in model container [2022-07-22 01:24:37,270 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2022-07-22 01:24:37,271 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.07 01:24:37" (3/3) ... [2022-07-22 01:24:37,272 INFO L354 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1a-2.c [2022-07-22 01:24:37,374 INFO L255 stractBuchiCegarLoop]: Interprodecural is true [2022-07-22 01:24:37,375 INFO L256 stractBuchiCegarLoop]: Hoare is false [2022-07-22 01:24:37,375 INFO L257 stractBuchiCegarLoop]: Compute interpolants for ForwardPredicates [2022-07-22 01:24:37,375 INFO L258 stractBuchiCegarLoop]: Backedges is STRAIGHT_LINE [2022-07-22 01:24:37,375 INFO L259 stractBuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2022-07-22 01:24:37,375 INFO L260 stractBuchiCegarLoop]: Difference is false [2022-07-22 01:24:37,375 INFO L261 stractBuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2022-07-22 01:24:37,376 INFO L265 stractBuchiCegarLoop]: ======== Iteration 0 == of CEGAR loop == BuchiAutomatonCegarLoop ======== [2022-07-22 01:24:37,379 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand has 23 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-07-22 01:24:37,411 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2022-07-22 01:24:37,411 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2022-07-22 01:24:37,411 INFO L119 BuchiIsEmpty]: Starting construction of run [2022-07-22 01:24:37,423 INFO L179 hiAutomatonCegarLoop]: Counterexample stem histogram [1, 1, 1, 1] [2022-07-22 01:24:37,424 INFO L180 hiAutomatonCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 01:24:37,424 INFO L287 stractBuchiCegarLoop]: ======== Iteration 1 ============ [2022-07-22 01:24:37,424 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand has 23 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-07-22 01:24:37,430 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2022-07-22 01:24:37,430 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2022-07-22 01:24:37,430 INFO L119 BuchiIsEmpty]: Starting construction of run [2022-07-22 01:24:37,431 INFO L179 hiAutomatonCegarLoop]: Counterexample stem histogram [1, 1, 1, 1] [2022-07-22 01:24:37,431 INFO L180 hiAutomatonCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 01:24:37,438 INFO L752 eck$LassoCheckResult]: Stem: 4#ULTIMATE.startENTRYtrue assume { :begin_inline_ULTIMATE.init } true; 13#L-1true assume { :end_inline_ULTIMATE.init } true;assume { :begin_inline_main } true;havoc main_#res#1;havoc main_#t~nondet5#1, main_#t~ret6#1, main_~x~0#1;main_~x~0#1 := main_#t~nondet5#1;havoc main_#t~nondet5#1; 12#L26true assume !!(main_~x~0#1 <= 2147483646); 7#L27true call main_#t~ret6#1 := rec2(main_~x~0#1);< 16#rec2ENTRYtrue [2022-07-22 01:24:37,439 INFO L754 eck$LassoCheckResult]: Loop: 16#rec2ENTRYtrue ~j := #in~j; 17#L18true assume !(~j <= 0); 20#L20true call #t~ret3 := rec1(1 + ~j);< 22#rec1ENTRYtrue ~i := #in~i; 18#L12true assume ~i <= 0;#res := 0; 14#rec1FINALtrue assume true; 15#rec1EXITtrue >#39#return; 3#L20-1true call #t~ret4 := rec2(#t~ret3);< 16#rec2ENTRYtrue [2022-07-22 01:24:37,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 01:24:37,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1510579, now seen corresponding path program 1 times [2022-07-22 01:24:37,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 01:24:37,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044111636] [2022-07-22 01:24:37,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 01:24:37,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 01:24:37,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-22 01:24:37,548 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-22 01:24:37,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-22 01:24:37,574 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-22 01:24:37,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 01:24:37,578 INFO L85 PathProgramCache]: Analyzing trace with hash -931063642, now seen corresponding path program 1 times [2022-07-22 01:24:37,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 01:24:37,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466452642] [2022-07-22 01:24:37,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 01:24:37,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 01:24:37,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 01:24:37,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-07-22 01:24:37,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-22 01:24:37,704 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-22 01:24:37,705 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-22 01:24:37,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466452642] [2022-07-22 01:24:37,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466452642] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-22 01:24:37,706 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-22 01:24:37,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-07-22 01:24:37,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553714718] [2022-07-22 01:24:37,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-22 01:24:37,711 INFO L769 eck$LassoCheckResult]: loop already infeasible [2022-07-22 01:24:37,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-22 01:24:37,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-07-22 01:24:37,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-07-22 01:24:37,746 INFO L87 Difference]: Start difference. First operand has 23 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-22 01:24:37,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-22 01:24:37,804 INFO L93 Difference]: Finished difference Result 27 states and 36 transitions. [2022-07-22 01:24:37,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-07-22 01:24:37,819 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 27 states and 36 transitions. [2022-07-22 01:24:37,822 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2022-07-22 01:24:37,827 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 27 states to 18 states and 24 transitions. [2022-07-22 01:24:37,828 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 18 [2022-07-22 01:24:37,829 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 18 [2022-07-22 01:24:37,829 INFO L73 IsDeterministic]: Start isDeterministic. Operand 18 states and 24 transitions. [2022-07-22 01:24:37,830 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2022-07-22 01:24:37,831 INFO L369 hiAutomatonCegarLoop]: Abstraction has 18 states and 24 transitions. [2022-07-22 01:24:37,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states and 24 transitions. [2022-07-22 01:24:37,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-07-22 01:24:37,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 10 states have (on average 1.1) internal successors, (11), 11 states have internal predecessors, (11), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-07-22 01:24:37,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 24 transitions. [2022-07-22 01:24:37,860 INFO L392 hiAutomatonCegarLoop]: Abstraction has 18 states and 24 transitions. [2022-07-22 01:24:37,860 INFO L374 stractBuchiCegarLoop]: Abstraction has 18 states and 24 transitions. [2022-07-22 01:24:37,860 INFO L287 stractBuchiCegarLoop]: ======== Iteration 2 ============ [2022-07-22 01:24:37,861 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 18 states and 24 transitions. [2022-07-22 01:24:37,864 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2022-07-22 01:24:37,864 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2022-07-22 01:24:37,864 INFO L119 BuchiIsEmpty]: Starting construction of run [2022-07-22 01:24:37,866 INFO L179 hiAutomatonCegarLoop]: Counterexample stem histogram [1, 1, 1, 1] [2022-07-22 01:24:37,866 INFO L180 hiAutomatonCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-22 01:24:37,867 INFO L752 eck$LassoCheckResult]: Stem: 70#ULTIMATE.startENTRY assume { :begin_inline_ULTIMATE.init } true; 71#L-1 assume { :end_inline_ULTIMATE.init } true;assume { :begin_inline_main } true;havoc main_#res#1;havoc main_#t~nondet5#1, main_#t~ret6#1, main_~x~0#1;main_~x~0#1 := main_#t~nondet5#1;havoc main_#t~nondet5#1; 79#L26 assume !!(main_~x~0#1 <= 2147483646); 68#L27 call main_#t~ret6#1 := rec2(main_~x~0#1);< 69#rec2ENTRY [2022-07-22 01:24:37,868 INFO L754 eck$LassoCheckResult]: Loop: 69#rec2ENTRY ~j := #in~j; 82#L18 assume !(~j <= 0); 73#L20 call #t~ret3 := rec1(1 + ~j);< 78#rec1ENTRY ~i := #in~i; 83#L12 assume !(~i <= 0); 74#L14 call #t~ret0 := rec1(~i - 2);< 78#rec1ENTRY ~i := #in~i; 83#L12 assume ~i <= 0;#res := 0; 80#rec1FINAL assume true; 81#rec1EXIT >#33#return; 75#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 78#rec1ENTRY ~i := #in~i; 83#L12 assume ~i <= 0;#res := 0; 80#rec1FINAL assume true; 81#rec1EXIT >#35#return; 76#L14-2 call #t~ret2 := rec1(#t~ret1);< 78#rec1ENTRY ~i := #in~i; 83#L12 assume ~i <= 0;#res := 0; 80#rec1FINAL assume true; 81#rec1EXIT >#37#return; 72#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret1;havoc #t~ret2; 77#rec1FINAL assume true; 84#rec1EXIT >#39#return; 67#L20-1 call #t~ret4 := rec2(#t~ret3);< 69#rec2ENTRY [2022-07-22 01:24:37,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 01:24:37,870 INFO L85 PathProgramCache]: Analyzing trace with hash 1510579, now seen corresponding path program 2 times [2022-07-22 01:24:37,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 01:24:37,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685587540] [2022-07-22 01:24:37,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 01:24:37,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 01:24:37,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-22 01:24:37,880 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-22 01:24:37,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-22 01:24:37,883 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-22 01:24:37,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 01:24:37,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1852060604, now seen corresponding path program 1 times [2022-07-22 01:24:37,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 01:24:37,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590695027] [2022-07-22 01:24:37,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 01:24:37,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 01:24:37,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-22 01:24:37,913 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-22 01:24:37,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-22 01:24:37,935 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-22 01:24:37,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-22 01:24:37,936 INFO L85 PathProgramCache]: Analyzing trace with hash -2035496338, now seen corresponding path program 1 times [2022-07-22 01:24:37,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-22 01:24:37,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121574392] [2022-07-22 01:24:37,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-22 01:24:37,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-22 01:24:37,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-22 01:24:37,960 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-22 01:24:37,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-22 01:24:37,978 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-22 01:24:38,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 22.07 01:24:38 BoogieIcfgContainer [2022-07-22 01:24:38,328 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2022-07-22 01:24:38,329 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-07-22 01:24:38,329 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-07-22 01:24:38,329 INFO L275 PluginConnector]: Witness Printer initialized [2022-07-22 01:24:38,330 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.07 01:24:37" (3/4) ... [2022-07-22 01:24:38,332 INFO L134 WitnessPrinter]: Generating witness for non-termination counterexample [2022-07-22 01:24:38,377 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2022-07-22 01:24:38,380 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-07-22 01:24:38,381 INFO L158 Benchmark]: Toolchain (without parser) took 1615.34ms. Allocated memory was 56.6MB in the beginning and 69.2MB in the end (delta: 12.6MB). Free memory was 41.8MB in the beginning and 39.0MB in the end (delta: 2.7MB). Peak memory consumption was 13.5MB. Max. memory is 16.1GB. [2022-07-22 01:24:38,382 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 46.1MB. Free memory was 28.3MB in the beginning and 28.3MB in the end (delta: 30.1kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-22 01:24:38,382 INFO L158 Benchmark]: CACSL2BoogieTranslator took 155.24ms. Allocated memory is still 56.6MB. Free memory was 41.5MB in the beginning and 32.8MB in the end (delta: 8.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-22 01:24:38,383 INFO L158 Benchmark]: Boogie Procedure Inliner took 68.70ms. Allocated memory is still 56.6MB. Free memory was 32.8MB in the beginning and 40.3MB in the end (delta: -7.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-22 01:24:38,384 INFO L158 Benchmark]: Boogie Preprocessor took 14.81ms. Allocated memory is still 56.6MB. Free memory was 40.3MB in the beginning and 39.4MB in the end (delta: 917.3kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-22 01:24:38,384 INFO L158 Benchmark]: RCFGBuilder took 253.65ms. Allocated memory is still 56.6MB. Free memory was 39.4MB in the beginning and 31.2MB in the end (delta: 8.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2022-07-22 01:24:38,386 INFO L158 Benchmark]: BuchiAutomizer took 1064.69ms. Allocated memory was 56.6MB in the beginning and 69.2MB in the end (delta: 12.6MB). Free memory was 31.0MB in the beginning and 40.7MB in the end (delta: -9.7MB). Peak memory consumption was 10.9MB. Max. memory is 16.1GB. [2022-07-22 01:24:38,387 INFO L158 Benchmark]: Witness Printer took 50.96ms. Allocated memory is still 69.2MB. Free memory was 40.7MB in the beginning and 39.0MB in the end (delta: 1.7MB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-22 01:24:38,390 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24ms. Allocated memory is still 46.1MB. Free memory was 28.3MB in the beginning and 28.3MB in the end (delta: 30.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 155.24ms. Allocated memory is still 56.6MB. Free memory was 41.5MB in the beginning and 32.8MB in the end (delta: 8.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 68.70ms. Allocated memory is still 56.6MB. Free memory was 32.8MB in the beginning and 40.3MB in the end (delta: -7.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 14.81ms. Allocated memory is still 56.6MB. Free memory was 40.3MB in the beginning and 39.4MB in the end (delta: 917.3kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 253.65ms. Allocated memory is still 56.6MB. Free memory was 39.4MB in the beginning and 31.2MB in the end (delta: 8.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * BuchiAutomizer took 1064.69ms. Allocated memory was 56.6MB in the beginning and 69.2MB in the end (delta: 12.6MB). Free memory was 31.0MB in the beginning and 40.7MB in the end (delta: -9.7MB). Peak memory consumption was 10.9MB. Max. memory is 16.1GB. * Witness Printer took 50.96ms. Allocated memory is still 69.2MB. Free memory was 40.7MB in the beginning and 39.0MB in the end (delta: 1.7MB). There was no memory consumed. Max. memory is 16.1GB. * 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 18 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 0.9s 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 -1 states and ocurred in iteration -1. Nontrivial modules had stage [0, 0, 0, 0, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 0/0 HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 15 SdHoareTripleChecker+Valid, 0.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 7 mSDsluCounter, 81 SdHoareTripleChecker+Invalid, 0.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 55 mSDsCounter, 0 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 32 IncrementalHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 0 mSolverCounterUnsat, 26 mSDtfsCounter, 32 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown 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 InitialAbstractionConstructionTime: 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 {org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@4b43980d=0, \old(j)=1, \result=0, NULL=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@6030c57f=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@4a011971=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@1b665443=0, \result=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! [2022-07-22 01:24:38,446 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(TERM)