./Ultimate.py --spec ../../sv-benchmarks/c/properties/termination.prp --file ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for termination Using default analysis Version 69874e26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/config/AutomizerTermination.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c -s /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer --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 cb528549fa76ae8087cf7043645dfa20323a0116 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-69874e2 [2020-12-01 15:35:02,400 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-01 15:35:02,403 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-01 15:35:02,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-01 15:35:02,465 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-01 15:35:02,471 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-01 15:35:02,475 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-01 15:35:02,480 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-01 15:35:02,483 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-01 15:35:02,496 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-01 15:35:02,497 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-01 15:35:02,500 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-01 15:35:02,501 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-01 15:35:02,505 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-01 15:35:02,507 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-01 15:35:02,510 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-01 15:35:02,512 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-01 15:35:02,516 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-01 15:35:02,520 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-01 15:35:02,529 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-01 15:35:02,532 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-01 15:35:02,534 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-01 15:35:02,536 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-01 15:35:02,538 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-01 15:35:02,548 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-01 15:35:02,548 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-01 15:35:02,549 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-01 15:35:02,551 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-01 15:35:02,553 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-01 15:35:02,554 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-01 15:35:02,555 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-01 15:35:02,556 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-01 15:35:02,561 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-01 15:35:02,562 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-01 15:35:02,564 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-01 15:35:02,564 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-01 15:35:02,565 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-01 15:35:02,566 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-01 15:35:02,566 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-01 15:35:02,567 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-01 15:35:02,568 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-01 15:35:02,571 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-12-01 15:35:02,617 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-01 15:35:02,618 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-01 15:35:02,620 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-01 15:35:02,621 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-01 15:35:02,621 INFO L138 SettingsManager]: * Use SBE=true [2020-12-01 15:35:02,621 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-12-01 15:35:02,622 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-12-01 15:35:02,622 INFO L138 SettingsManager]: * Use old map elimination=false [2020-12-01 15:35:02,622 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-12-01 15:35:02,622 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-12-01 15:35:02,624 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-12-01 15:35:02,624 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-01 15:35:02,624 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-01 15:35:02,625 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-01 15:35:02,625 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-01 15:35:02,625 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-12-01 15:35:02,626 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-12-01 15:35:02,626 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-12-01 15:35:02,626 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-01 15:35:02,627 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-12-01 15:35:02,627 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-01 15:35:02,627 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-12-01 15:35:02,628 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-01 15:35:02,628 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-01 15:35:02,628 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-12-01 15:35:02,629 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-01 15:35:02,629 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-01 15:35:02,629 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-01 15:35:02,629 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-12-01 15:35:02,632 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-12-01 15:35:02,632 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:/tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cb528549fa76ae8087cf7043645dfa20323a0116 [2020-12-01 15:35:02,974 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-01 15:35:03,025 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-01 15:35:03,027 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-01 15:35:03,029 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-01 15:35:03,034 INFO L275 PluginConnector]: CDTParser initialized [2020-12-01 15:35:03,035 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/../../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-12-01 15:35:03,134 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/data/9a6f6ff1b/97297a4994d147318ad208879796ad0c/FLAG097451c86 [2020-12-01 15:35:03,650 INFO L306 CDTParser]: Found 1 translation units. [2020-12-01 15:35:03,651 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-12-01 15:35:03,658 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/data/9a6f6ff1b/97297a4994d147318ad208879796ad0c/FLAG097451c86 [2020-12-01 15:35:04,023 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/data/9a6f6ff1b/97297a4994d147318ad208879796ad0c [2020-12-01 15:35:04,026 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-01 15:35:04,028 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-01 15:35:04,041 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-01 15:35:04,042 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-01 15:35:04,047 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-01 15:35:04,049 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,051 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e397608 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04, skipping insertion in model container [2020-12-01 15:35:04,052 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,061 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-01 15:35:04,077 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-01 15:35:04,221 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 15:35:04,226 INFO L203 MainTranslator]: Completed pre-run [2020-12-01 15:35:04,273 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 15:35:04,286 INFO L208 MainTranslator]: Completed translation [2020-12-01 15:35:04,287 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04 WrapperNode [2020-12-01 15:35:04,287 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-01 15:35:04,289 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-01 15:35:04,289 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-01 15:35:04,289 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-01 15:35:04,299 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,305 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,324 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-01 15:35:04,325 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-01 15:35:04,325 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-01 15:35:04,326 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-01 15:35:04,335 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,335 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,336 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,336 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,339 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,341 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,342 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... [2020-12-01 15:35:04,343 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-01 15:35:04,345 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-01 15:35:04,345 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-01 15:35:04,345 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-01 15:35:04,346 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/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 [2020-12-01 15:35:04,439 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-12-01 15:35:04,439 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-12-01 15:35:04,440 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-12-01 15:35:04,440 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-12-01 15:35:04,440 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-01 15:35:04,440 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-01 15:35:04,591 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-01 15:35:04,591 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-01 15:35:04,593 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 03:35:04 BoogieIcfgContainer [2020-12-01 15:35:04,594 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-01 15:35:04,595 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-12-01 15:35:04,595 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-12-01 15:35:04,599 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-12-01 15:35:04,600 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-12-01 15:35:04,601 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 01.12 03:35:04" (1/3) ... [2020-12-01 15:35:04,602 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@148afe71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 01.12 03:35:04, skipping insertion in model container [2020-12-01 15:35:04,603 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-12-01 15:35:04,603 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 03:35:04" (2/3) ... [2020-12-01 15:35:04,604 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@148afe71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 01.12 03:35:04, skipping insertion in model container [2020-12-01 15:35:04,604 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-12-01 15:35:04,604 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 03:35:04" (3/3) ... [2020-12-01 15:35:04,606 INFO L389 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1b.c [2020-12-01 15:35:04,670 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-12-01 15:35:04,671 INFO L360 BuchiCegarLoop]: Hoare is false [2020-12-01 15:35:04,671 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-12-01 15:35:04,671 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-01 15:35:04,671 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-01 15:35:04,671 INFO L364 BuchiCegarLoop]: Difference is false [2020-12-01 15:35:04,672 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-01 15:35:04,672 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-12-01 15:35:04,687 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-12-01 15:35:04,708 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:04,708 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:04,708 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:04,716 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-12-01 15:35:04,716 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:04,716 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-12-01 15:35:04,716 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-12-01 15:35:04,719 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:04,720 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:04,720 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:04,720 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-12-01 15:35:04,721 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:04,728 INFO L794 eck$LassoCheckResult]: Stem: 13#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; 22#L25true call main_#t~ret6 := rec2(main_~x~0);< 3#rec2ENTRYtrue [2020-12-01 15:35:04,728 INFO L796 eck$LassoCheckResult]: Loop: 3#rec2ENTRYtrue ~j := #in~j; 20#L18true assume !(~j <= 0); 18#L20true call #t~ret3 := rec1(~j - 1);< 4#rec1ENTRYtrue ~i := #in~i; 9#L12true assume ~i <= 0;#res := 0; 5#rec1FINALtrue assume true; 12#rec1EXITtrue >#33#return; 23#L20-1true call #t~ret4 := rec2(#t~ret3);< 3#rec2ENTRYtrue [2020-12-01 15:35:04,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:04,735 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2020-12-01 15:35:04,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:04,745 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330800371] [2020-12-01 15:35:04,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:04,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:04,804 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:04,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:04,810 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:04,829 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:04,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:04,831 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2020-12-01 15:35:04,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:04,832 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973231073] [2020-12-01 15:35:04,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:04,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:04,854 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:04,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:04,863 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:04,880 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:04,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:04,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1371489668, now seen corresponding path program 1 times [2020-12-01 15:35:04,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:04,883 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433880880] [2020-12-01 15:35:04,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:04,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:04,895 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:04,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:04,903 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:04,907 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:05,169 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:05,170 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:05,170 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:05,171 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:05,171 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-12-01 15:35:05,171 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,171 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:05,171 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:05,172 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-12-01 15:35:05,172 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:05,172 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:05,193 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,201 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,205 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,211 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,215 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,309 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:05,310 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:05,322 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:05,322 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,346 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:05,347 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_~j=0} Honda state: {rec2_~j=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:05,390 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:05,391 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,410 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:05,410 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#t~ret3=0} Honda state: {rec2_#t~ret3=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:05,458 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:05,458 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,474 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:05,474 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#res=0} Honda state: {rec2_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:05,520 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:05,521 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,533 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:05,534 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#t~ret4=0} Honda state: {rec2_#t~ret4=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:05,580 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:05,580 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:05,654 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-12-01 15:35:05,654 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,673 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-12-01 15:35:05,705 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:05,705 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:05,705 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:05,705 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:05,705 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-12-01 15:35:05,705 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,706 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:05,706 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:05,706 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-12-01 15:35:05,706 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:05,706 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:05,707 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,712 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,716 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,719 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,728 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:05,794 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:05,800 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:05,812 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:05,815 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:05,815 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:05,816 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:05,816 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:05,817 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:05,820 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:05,821 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,832 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:05,872 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:05,875 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:05,875 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:05,875 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:05,876 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:05,876 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,877 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:05,878 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:05,902 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 10 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:05,941 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:05,946 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:05,947 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:05,947 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:05,947 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:05,947 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:05,948 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:05,949 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:05,969 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:06,013 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:06,016 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:06,016 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:06,016 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:06,016 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:06,016 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:06,018 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:06,018 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:06,041 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-12-01 15:35:06,048 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-12-01 15:35:06,048 INFO L444 ModelExtractionUtils]: 0 out of 3 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:06,074 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-12-01 15:35:06,074 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-12-01 15:35:06,074 INFO L510 LassoAnalysis]: Proved termination. [2020-12-01 15:35:06,075 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#in~j) = 1*rec2_#in~j Supporting invariants [] Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:06,112 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-12-01 15:35:06,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:06,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:06,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-01 15:35:06,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:06,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:06,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-01 15:35:06,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:06,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 15:35:06,464 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 6 loop predicates [2020-12-01 15:35:06,466 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 21 states. Second operand 7 states. [2020-12-01 15:35:07,037 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 21 states.. Second operand 7 states. Result 194 states and 279 transitions. Complement of second has 61 states. [2020-12-01 15:35:07,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 11 states 1 stem states 9 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:07,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-12-01 15:35:07,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 57 transitions. [2020-12-01 15:35:07,045 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 8 letters. [2020-12-01 15:35:07,048 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:07,048 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 10 letters. Loop has 8 letters. [2020-12-01 15:35:07,049 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:07,049 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 16 letters. [2020-12-01 15:35:07,050 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:07,051 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 194 states and 279 transitions. [2020-12-01 15:35:07,099 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:07,118 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 194 states to 82 states and 120 transitions. [2020-12-01 15:35:07,119 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 35 [2020-12-01 15:35:07,120 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 38 [2020-12-01 15:35:07,121 INFO L73 IsDeterministic]: Start isDeterministic. Operand 82 states and 120 transitions. [2020-12-01 15:35:07,121 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:07,122 INFO L692 BuchiCegarLoop]: Abstraction has 82 states and 120 transitions. [2020-12-01 15:35:07,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states and 120 transitions. [2020-12-01 15:35:07,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-12-01 15:35:07,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-12-01 15:35:07,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 83 transitions. [2020-12-01 15:35:07,179 INFO L715 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-12-01 15:35:07,180 INFO L595 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-12-01 15:35:07,180 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-12-01 15:35:07,180 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 55 states and 83 transitions. [2020-12-01 15:35:07,184 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:07,185 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:07,185 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:07,185 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:07,186 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-12-01 15:35:07,186 INFO L794 eck$LassoCheckResult]: Stem: 378#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; 345#L25 call main_#t~ret6 := rec2(main_~x~0);< 344#rec2ENTRY ~j := #in~j; 347#L18 assume !(~j <= 0); 363#L20 call #t~ret3 := rec1(~j - 1);< 379#rec1ENTRY ~i := #in~i; 397#L12 assume !(~i <= 0); 351#L14 call #t~ret0 := rec1(~i - 2);< 350#rec1ENTRY [2020-12-01 15:35:07,186 INFO L796 eck$LassoCheckResult]: Loop: 350#rec1ENTRY ~i := #in~i; 358#L12 assume !(~i <= 0); 354#L14 call #t~ret0 := rec1(~i - 2);< 350#rec1ENTRY [2020-12-01 15:35:07,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:07,187 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2020-12-01 15:35:07,187 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:07,187 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147894345] [2020-12-01 15:35:07,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:07,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:07,198 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:07,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:07,205 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:07,208 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:07,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:07,222 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2020-12-01 15:35:07,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:07,222 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404000000] [2020-12-01 15:35:07,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:07,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:07,227 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:07,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:07,230 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:07,242 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:07,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:07,243 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2020-12-01 15:35:07,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:07,244 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995020286] [2020-12-01 15:35:07,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:07,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:07,253 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:07,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:07,261 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:07,263 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:07,297 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:07,297 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:07,297 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:07,297 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:07,298 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-12-01 15:35:07,298 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,298 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:07,298 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:07,298 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-12-01 15:35:07,299 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:07,299 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:07,300 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,303 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,306 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,312 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,315 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,328 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,377 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:07,379 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:07,398 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:07,398 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,418 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:07,418 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#res=0} Honda state: {rec1_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 14 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,449 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:07,449 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:07,471 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:07,471 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 15 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,501 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:07,502 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:07,515 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:07,515 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret0=0} Honda state: {rec1_#t~ret0=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 16 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,537 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:07,537 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:07,564 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:07,564 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret1=0} Honda state: {rec1_#t~ret1=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:07,620 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:07,621 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,645 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:07,646 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret2=0} Honda state: {rec1_#t~ret2=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:07,693 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:07,693 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:07,769 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-12-01 15:35:07,769 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,813 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-12-01 15:35:07,815 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:07,815 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:07,816 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:07,816 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:07,816 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-12-01 15:35:07,816 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,816 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:07,816 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:07,816 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-12-01 15:35:07,816 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:07,816 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:07,817 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,835 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,839 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,842 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,846 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,854 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:07,912 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:07,912 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:07,929 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:07,931 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:07,931 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:07,931 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:07,931 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:07,931 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:07,932 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:07,932 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,950 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 21 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:07,989 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:07,992 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:07,992 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:07,992 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:07,992 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:07,993 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:07,995 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:07,995 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:07,998 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 22 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,024 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:08,026 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:08,026 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:08,026 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:08,027 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:08,027 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:08,027 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:08,028 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:08,049 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 23 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,076 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:08,078 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:08,078 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:08,078 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:08,078 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:08,078 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:08,079 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:08,079 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:08,088 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 24 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,110 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:08,112 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:08,112 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:08,112 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:08,112 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:08,112 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:08,113 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:08,113 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:08,116 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-12-01 15:35:08,118 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-12-01 15:35:08,118 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 25 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,122 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-12-01 15:35:08,122 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-12-01 15:35:08,122 INFO L510 LassoAnalysis]: Proved termination. [2020-12-01 15:35:08,122 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-12-01 15:35:08,145 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-12-01 15:35:08,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:08,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:08,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-01 15:35:08,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:08,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:08,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-01 15:35:08,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:08,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 15:35:08,307 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 3 loop predicates [2020-12-01 15:35:08,307 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 55 states and 83 transitions. cyclomatic complexity: 32 Second operand 4 states. [2020-12-01 15:35:08,429 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 55 states and 83 transitions. cyclomatic complexity: 32. Second operand 4 states. Result 105 states and 149 transitions. Complement of second has 13 states. [2020-12-01 15:35:08,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:08,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-12-01 15:35:08,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 17 transitions. [2020-12-01 15:35:08,439 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 3 letters. [2020-12-01 15:35:08,439 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:08,439 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 11 letters. Loop has 3 letters. [2020-12-01 15:35:08,440 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:08,440 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 6 letters. [2020-12-01 15:35:08,440 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:08,440 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 105 states and 149 transitions. [2020-12-01 15:35:08,447 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:08,459 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 105 states to 93 states and 137 transitions. [2020-12-01 15:35:08,463 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 37 [2020-12-01 15:35:08,464 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 39 [2020-12-01 15:35:08,464 INFO L73 IsDeterministic]: Start isDeterministic. Operand 93 states and 137 transitions. [2020-12-01 15:35:08,466 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:08,466 INFO L692 BuchiCegarLoop]: Abstraction has 93 states and 137 transitions. [2020-12-01 15:35:08,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states and 137 transitions. [2020-12-01 15:35:08,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2020-12-01 15:35:08,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-12-01 15:35:08,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 129 transitions. [2020-12-01 15:35:08,482 INFO L715 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-12-01 15:35:08,482 INFO L595 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-12-01 15:35:08,482 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-12-01 15:35:08,482 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 89 states and 129 transitions. [2020-12-01 15:35:08,485 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:08,485 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:08,486 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:08,486 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:08,487 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-12-01 15:35:08,487 INFO L794 eck$LassoCheckResult]: Stem: 613#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; 614#L25 call main_#t~ret6 := rec2(main_~x~0);< 620#rec2ENTRY ~j := #in~j; 633#L18 assume !(~j <= 0); 615#L20 call #t~ret3 := rec1(~j - 1);< 642#rec1ENTRY ~i := #in~i; 637#L12 assume !(~i <= 0); 577#L14 call #t~ret0 := rec1(~i - 2);< 576#rec1ENTRY ~i := #in~i; 579#L12 assume ~i <= 0;#res := 0; 583#rec1FINAL assume true; 584#rec1EXIT >#27#return; 593#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 595#rec1ENTRY [2020-12-01 15:35:08,487 INFO L796 eck$LassoCheckResult]: Loop: 595#rec1ENTRY ~i := #in~i; 632#L12 assume !(~i <= 0); 589#L14 call #t~ret0 := rec1(~i - 2);< 595#rec1ENTRY [2020-12-01 15:35:08,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:08,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2020-12-01 15:35:08,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:08,488 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044312636] [2020-12-01 15:35:08,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:08,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:08,496 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:08,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:08,503 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:08,505 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:08,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:08,506 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2020-12-01 15:35:08,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:08,507 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688085467] [2020-12-01 15:35:08,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:08,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:08,510 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:08,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:08,513 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:08,514 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:08,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:08,515 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2020-12-01 15:35:08,516 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:08,516 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819808956] [2020-12-01 15:35:08,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:08,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:08,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-12-01 15:35:08,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:08,598 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-01 15:35:08,598 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819808956] [2020-12-01 15:35:08,599 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-01 15:35:08,599 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-12-01 15:35:08,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748158958] [2020-12-01 15:35:08,656 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:08,656 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:08,656 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:08,656 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:08,656 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-12-01 15:35:08,657 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,657 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:08,657 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:08,657 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-12-01 15:35:08,657 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:08,657 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:08,658 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,662 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,683 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,686 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,690 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,693 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,741 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:08,741 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:08,746 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:08,747 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,757 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:08,757 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret2=0} Honda state: {rec1_#t~ret2=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 27 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,780 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:08,780 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:08,804 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-12-01 15:35:08,804 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,831 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-12-01 15:35:08,832 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:08,832 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:08,832 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:08,833 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:08,833 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-12-01 15:35:08,833 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,833 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:08,833 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:08,833 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-12-01 15:35:08,833 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:08,833 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:08,834 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,838 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,846 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,849 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,853 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,856 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:08,900 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:08,900 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:08,907 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:08,909 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:08,909 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:08,909 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:08,909 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:08,909 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:08,910 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:08,910 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,930 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 30 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,962 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:08,963 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:08,964 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:08,964 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:08,964 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:08,964 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:08,966 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:08,967 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:08,981 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-12-01 15:35:08,986 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-12-01 15:35:08,986 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 31 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:08,989 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-12-01 15:35:08,989 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-12-01 15:35:08,989 INFO L510 LassoAnalysis]: Proved termination. [2020-12-01 15:35:08,989 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-12-01 15:35:09,010 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-12-01 15:35:09,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:09,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:09,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-01 15:35:09,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:09,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:09,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-01 15:35:09,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:09,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 15:35:09,201 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-12-01 15:35:09,201 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 89 states and 129 transitions. cyclomatic complexity: 47 Second operand 5 states. [2020-12-01 15:35:09,369 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 89 states and 129 transitions. cyclomatic complexity: 47. Second operand 5 states. Result 134 states and 193 transitions. Complement of second has 14 states. [2020-12-01 15:35:09,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:09,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-12-01 15:35:09,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 19 transitions. [2020-12-01 15:35:09,371 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 3 letters. [2020-12-01 15:35:09,372 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:09,372 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 16 letters. Loop has 3 letters. [2020-12-01 15:35:09,372 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:09,373 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 6 letters. [2020-12-01 15:35:09,373 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:09,373 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 134 states and 193 transitions. [2020-12-01 15:35:09,387 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:09,395 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 134 states to 122 states and 181 transitions. [2020-12-01 15:35:09,399 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 48 [2020-12-01 15:35:09,401 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2020-12-01 15:35:09,401 INFO L73 IsDeterministic]: Start isDeterministic. Operand 122 states and 181 transitions. [2020-12-01 15:35:09,401 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:09,401 INFO L692 BuchiCegarLoop]: Abstraction has 122 states and 181 transitions. [2020-12-01 15:35:09,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states and 181 transitions. [2020-12-01 15:35:09,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 113. [2020-12-01 15:35:09,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-12-01 15:35:09,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 165 transitions. [2020-12-01 15:35:09,433 INFO L715 BuchiCegarLoop]: Abstraction has 113 states and 165 transitions. [2020-12-01 15:35:09,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 15:35:09,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-01 15:35:09,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-12-01 15:35:09,439 INFO L87 Difference]: Start difference. First operand 113 states and 165 transitions. Second operand 6 states. [2020-12-01 15:35:09,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 15:35:09,527 INFO L93 Difference]: Finished difference Result 123 states and 175 transitions. [2020-12-01 15:35:09,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-01 15:35:09,528 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 123 states and 175 transitions. [2020-12-01 15:35:09,542 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2020-12-01 15:35:09,551 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 123 states to 121 states and 173 transitions. [2020-12-01 15:35:09,556 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 55 [2020-12-01 15:35:09,557 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 55 [2020-12-01 15:35:09,557 INFO L73 IsDeterministic]: Start isDeterministic. Operand 121 states and 173 transitions. [2020-12-01 15:35:09,557 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:09,557 INFO L692 BuchiCegarLoop]: Abstraction has 121 states and 173 transitions. [2020-12-01 15:35:09,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states and 173 transitions. [2020-12-01 15:35:09,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 101. [2020-12-01 15:35:09,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-12-01 15:35:09,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 143 transitions. [2020-12-01 15:35:09,575 INFO L715 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-12-01 15:35:09,575 INFO L595 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-12-01 15:35:09,575 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-12-01 15:35:09,576 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 101 states and 143 transitions. [2020-12-01 15:35:09,577 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2020-12-01 15:35:09,577 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:09,577 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:09,579 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:09,580 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:09,580 INFO L794 eck$LassoCheckResult]: Stem: 1167#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; 1168#L25 call main_#t~ret6 := rec2(main_~x~0);< 1174#rec2ENTRY ~j := #in~j; 1185#L18 assume !(~j <= 0); 1146#L20 call #t~ret3 := rec1(~j - 1);< 1184#rec1ENTRY ~i := #in~i; 1183#L12 assume !(~i <= 0); 1156#L14 call #t~ret0 := rec1(~i - 2);< 1181#rec1ENTRY ~i := #in~i; 1179#L12 assume !(~i <= 0); 1161#L14 call #t~ret0 := rec1(~i - 2);< 1178#rec1ENTRY ~i := #in~i; 1180#L12 assume ~i <= 0;#res := 0; 1222#rec1FINAL assume true; 1166#rec1EXIT >#27#return; 1133#L14-1 [2020-12-01 15:35:09,580 INFO L796 eck$LassoCheckResult]: Loop: 1133#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1132#rec1ENTRY ~i := #in~i; 1135#L12 assume ~i <= 0;#res := 0; 1140#rec1FINAL assume true; 1141#rec1EXIT >#29#return; 1154#L14-2 call #t~ret2 := rec1(#t~ret1);< 1163#rec1ENTRY ~i := #in~i; 1204#L12 assume !(~i <= 0); 1157#L14 call #t~ret0 := rec1(~i - 2);< 1163#rec1ENTRY ~i := #in~i; 1204#L12 assume ~i <= 0;#res := 0; 1205#rec1FINAL assume true; 1213#rec1EXIT >#27#return; 1133#L14-1 [2020-12-01 15:35:09,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:09,581 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2020-12-01 15:35:09,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:09,582 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949521212] [2020-12-01 15:35:09,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:09,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:09,612 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:09,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:09,619 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:09,622 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:09,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:09,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2020-12-01 15:35:09,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:09,624 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326947997] [2020-12-01 15:35:09,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:09,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:09,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-12-01 15:35:09,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:09,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-12-01 15:35:09,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:09,678 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-01 15:35:09,678 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326947997] [2020-12-01 15:35:09,678 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017374665] [2020-12-01 15:35:09,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 15:35:09,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:09,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-01 15:35:09,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:09,744 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 15:35:09,745 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-01 15:35:09,745 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2020-12-01 15:35:09,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255934336] [2020-12-01 15:35:09,746 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-12-01 15:35:09,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 15:35:09,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-01 15:35:09,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-12-01 15:35:09,747 INFO L87 Difference]: Start difference. First operand 101 states and 143 transitions. cyclomatic complexity: 49 Second operand 6 states. [2020-12-01 15:35:09,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 15:35:09,811 INFO L93 Difference]: Finished difference Result 117 states and 161 transitions. [2020-12-01 15:35:09,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-01 15:35:09,812 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 117 states and 161 transitions. [2020-12-01 15:35:09,815 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:09,818 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 117 states to 117 states and 161 transitions. [2020-12-01 15:35:09,819 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 53 [2020-12-01 15:35:09,819 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 53 [2020-12-01 15:35:09,819 INFO L73 IsDeterministic]: Start isDeterministic. Operand 117 states and 161 transitions. [2020-12-01 15:35:09,819 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:09,820 INFO L692 BuchiCegarLoop]: Abstraction has 117 states and 161 transitions. [2020-12-01 15:35:09,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states and 161 transitions. [2020-12-01 15:35:09,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2020-12-01 15:35:09,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-12-01 15:35:09,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 157 transitions. [2020-12-01 15:35:09,841 INFO L715 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-12-01 15:35:09,842 INFO L595 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-12-01 15:35:09,842 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-12-01 15:35:09,842 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 113 states and 157 transitions. [2020-12-01 15:35:09,843 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-12-01 15:35:09,844 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:09,844 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:09,846 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:09,846 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:09,847 INFO L794 eck$LassoCheckResult]: Stem: 1445#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1446#L25 call main_#t~ret6 := rec2(main_~x~0);< 1458#rec2ENTRY ~j := #in~j; 1471#L18 assume !(~j <= 0); 1422#L20 call #t~ret3 := rec1(~j - 1);< 1470#rec1ENTRY ~i := #in~i; 1469#L12 assume !(~i <= 0); 1418#L14 call #t~ret0 := rec1(~i - 2);< 1467#rec1ENTRY ~i := #in~i; 1440#L12 assume ~i <= 0;#res := 0; 1417#rec1FINAL assume true; 1419#rec1EXIT >#27#return; 1410#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1441#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1434#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret0;havoc #t~ret1; 1435#rec1FINAL assume true; 1464#rec1EXIT >#33#return; 1404#L20-1 [2020-12-01 15:35:09,847 INFO L796 eck$LassoCheckResult]: Loop: 1404#L20-1 call #t~ret4 := rec2(#t~ret3);< 1403#rec2ENTRY ~j := #in~j; 1405#L18 assume !(~j <= 0); 1452#L20 call #t~ret3 := rec1(~j - 1);< 1454#rec1ENTRY ~i := #in~i; 1512#L12 assume !(~i <= 0); 1447#L14 call #t~ret0 := rec1(~i - 2);< 1454#rec1ENTRY ~i := #in~i; 1512#L12 assume ~i <= 0;#res := 0; 1511#rec1FINAL assume true; 1507#rec1EXIT >#27#return; 1411#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1506#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1463#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret0;havoc #t~ret1; 1475#rec1FINAL assume true; 1461#rec1EXIT >#33#return; 1404#L20-1 [2020-12-01 15:35:09,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:09,848 INFO L82 PathProgramCache]: Analyzing trace with hash -790062692, now seen corresponding path program 1 times [2020-12-01 15:35:09,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:09,849 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225602946] [2020-12-01 15:35:09,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:09,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:09,877 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:09,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:09,893 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:09,896 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:09,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:09,897 INFO L82 PathProgramCache]: Analyzing trace with hash 125202860, now seen corresponding path program 1 times [2020-12-01 15:35:09,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:09,897 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109745951] [2020-12-01 15:35:09,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:09,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:09,906 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:09,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:09,914 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:09,917 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:09,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:09,918 INFO L82 PathProgramCache]: Analyzing trace with hash -2019382713, now seen corresponding path program 1 times [2020-12-01 15:35:09,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:09,918 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591133356] [2020-12-01 15:35:09,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:09,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:09,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-01 15:35:09,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-01 15:35:10,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-12-01 15:35:10,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-12-01 15:35:10,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-12-01 15:35:10,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-01 15:35:10,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-12-01 15:35:10,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-12-01 15:35:10,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,169 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-12-01 15:35:10,170 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591133356] [2020-12-01 15:35:10,170 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067190838] [2020-12-01 15:35:10,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 15:35:10,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:10,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-01 15:35:10,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:10,393 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-12-01 15:35:10,393 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 15:35:10,393 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2020-12-01 15:35:10,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554217568] [2020-12-01 15:35:10,755 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:10,755 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:10,756 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:10,756 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:10,756 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-12-01 15:35:10,756 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:10,756 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:10,756 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:10,756 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-12-01 15:35:10,756 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:10,756 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:10,757 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:10,790 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:10,794 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:10,838 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:10,838 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 34 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 34 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:10,846 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:10,847 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 35 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 35 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:10,893 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-12-01 15:35:10,894 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:13,483 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-12-01 15:35:13,486 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:13,487 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:13,487 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:13,487 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:13,487 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-12-01 15:35:13,487 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:13,487 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:13,487 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:13,487 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-12-01 15:35:13,487 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:13,487 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:13,488 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:13,491 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:13,494 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:13,553 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:13,553 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:13,556 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:13,558 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:13,558 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:13,558 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:13,558 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:13,558 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:13,559 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:13,559 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:13,577 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:13,598 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:13,600 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:13,600 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:13,601 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:13,601 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:13,601 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:13,601 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:13,601 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:13,603 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 38 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:13,624 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:13,625 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:13,625 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:13,625 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:13,625 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:13,625 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:13,628 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:13,628 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:13,631 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-12-01 15:35:13,637 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-12-01 15:35:13,637 INFO L444 ModelExtractionUtils]: 2 out of 5 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 39 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:13,640 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-12-01 15:35:13,640 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-12-01 15:35:13,640 INFO L510 LassoAnalysis]: Proved termination. [2020-12-01 15:35:13,640 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#t~ret3) = 1*rec2_#t~ret3 Supporting invariants [] [2020-12-01 15:35:13,658 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-12-01 15:35:13,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:13,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:13,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-01 15:35:13,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:13,814 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:13,848 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:13,866 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:13,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:13,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-01 15:35:13,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:14,221 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-01 15:35:14,222 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 9 loop predicates [2020-12-01 15:35:14,222 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 113 states and 157 transitions. cyclomatic complexity: 51 Second operand 11 states. [2020-12-01 15:35:14,771 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 113 states and 157 transitions. cyclomatic complexity: 51. Second operand 11 states. Result 584 states and 903 transitions. Complement of second has 45 states. [2020-12-01 15:35:14,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 11 states 2 stem states 8 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:14,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-01 15:35:14,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 52 transitions. [2020-12-01 15:35:14,773 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 24 letters. [2020-12-01 15:35:14,774 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:14,774 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 49 letters. Loop has 24 letters. [2020-12-01 15:35:14,775 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:14,775 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 48 letters. [2020-12-01 15:35:14,776 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:14,776 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 584 states and 903 transitions. [2020-12-01 15:35:14,788 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-12-01 15:35:14,799 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 584 states to 432 states and 649 transitions. [2020-12-01 15:35:14,799 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 140 [2020-12-01 15:35:14,800 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 141 [2020-12-01 15:35:14,800 INFO L73 IsDeterministic]: Start isDeterministic. Operand 432 states and 649 transitions. [2020-12-01 15:35:14,800 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:14,800 INFO L692 BuchiCegarLoop]: Abstraction has 432 states and 649 transitions. [2020-12-01 15:35:14,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states and 649 transitions. [2020-12-01 15:35:14,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 383. [2020-12-01 15:35:14,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 383 states. [2020-12-01 15:35:14,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 534 transitions. [2020-12-01 15:35:14,834 INFO L715 BuchiCegarLoop]: Abstraction has 383 states and 534 transitions. [2020-12-01 15:35:14,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 15:35:14,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-01 15:35:14,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-12-01 15:35:14,835 INFO L87 Difference]: Start difference. First operand 383 states and 534 transitions. Second operand 12 states. [2020-12-01 15:35:15,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 15:35:15,093 INFO L93 Difference]: Finished difference Result 442 states and 645 transitions. [2020-12-01 15:35:15,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-01 15:35:15,094 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 442 states and 645 transitions. [2020-12-01 15:35:15,103 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-12-01 15:35:15,111 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 442 states to 349 states and 495 transitions. [2020-12-01 15:35:15,111 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 131 [2020-12-01 15:35:15,112 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 135 [2020-12-01 15:35:15,112 INFO L73 IsDeterministic]: Start isDeterministic. Operand 349 states and 495 transitions. [2020-12-01 15:35:15,122 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:15,122 INFO L692 BuchiCegarLoop]: Abstraction has 349 states and 495 transitions. [2020-12-01 15:35:15,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states and 495 transitions. [2020-12-01 15:35:15,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 314. [2020-12-01 15:35:15,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-12-01 15:35:15,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 415 transitions. [2020-12-01 15:35:15,149 INFO L715 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-12-01 15:35:15,149 INFO L595 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-12-01 15:35:15,150 INFO L427 BuchiCegarLoop]: ======== Iteration 6============ [2020-12-01 15:35:15,150 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 314 states and 415 transitions. [2020-12-01 15:35:15,152 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-12-01 15:35:15,153 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:15,153 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:15,155 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:15,155 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-12-01 15:35:15,155 INFO L794 eck$LassoCheckResult]: Stem: 3437#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 3438#L25 call main_#t~ret6 := rec2(main_~x~0);< 3454#rec2ENTRY ~j := #in~j; 3476#L18 assume !(~j <= 0); 3456#L20 call #t~ret3 := rec1(~j - 1);< 3474#rec1ENTRY ~i := #in~i; 3490#L12 assume !(~i <= 0); 3483#L14 call #t~ret0 := rec1(~i - 2);< 3489#rec1ENTRY ~i := #in~i; 3494#L12 assume ~i <= 0;#res := 0; 3548#rec1FINAL assume true; 3545#rec1EXIT >#27#return; 3540#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 3541#rec1ENTRY ~i := #in~i; 3544#L12 assume ~i <= 0;#res := 0; 3543#rec1FINAL assume true; 3539#rec1EXIT >#29#return; 3535#L14-2 call #t~ret2 := rec1(#t~ret1);< 3537#rec1ENTRY ~i := #in~i; 3542#L12 assume ~i <= 0;#res := 0; 3538#rec1FINAL assume true; 3536#rec1EXIT >#31#return; 3532#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret0;havoc #t~ret1; 3568#rec1FINAL assume true; 3455#rec1EXIT >#33#return; 3386#L20-1 call #t~ret4 := rec2(#t~ret3);< 3385#rec2ENTRY ~j := #in~j; 3387#L18 assume !(~j <= 0); 3521#L20 call #t~ret3 := rec1(~j - 1);< 3461#rec1ENTRY ~i := #in~i; 3567#L12 assume !(~i <= 0); 3423#L14 call #t~ret0 := rec1(~i - 2);< 3440#rec1ENTRY [2020-12-01 15:35:15,155 INFO L796 eck$LassoCheckResult]: Loop: 3440#rec1ENTRY ~i := #in~i; 3553#L12 assume !(~i <= 0); 3420#L14 call #t~ret0 := rec1(~i - 2);< 3440#rec1ENTRY [2020-12-01 15:35:15,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:15,156 INFO L82 PathProgramCache]: Analyzing trace with hash -744961728, now seen corresponding path program 2 times [2020-12-01 15:35:15,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:15,156 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467495542] [2020-12-01 15:35:15,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:15,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:15,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-12-01 15:35:15,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:15,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-01 15:35:15,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:15,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-12-01 15:35:15,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:15,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-12-01 15:35:15,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:15,334 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-12-01 15:35:15,335 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467495542] [2020-12-01 15:35:15,335 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [495486151] [2020-12-01 15:35:15,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 15:35:15,391 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-01 15:35:15,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-01 15:35:15,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-01 15:35:15,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:15,448 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-12-01 15:35:15,449 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 15:35:15,449 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2020-12-01 15:35:15,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225224996] [2020-12-01 15:35:15,454 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-12-01 15:35:15,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:15,454 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2020-12-01 15:35:15,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:15,455 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913131260] [2020-12-01 15:35:15,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:15,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:15,468 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:15,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:15,469 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:15,470 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:15,500 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:15,500 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:15,500 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:15,500 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:15,500 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-12-01 15:35:15,501 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:15,501 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:15,501 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:15,501 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-12-01 15:35:15,501 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:15,501 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:15,504 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,508 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,516 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,520 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,524 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,527 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,576 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:15,577 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:15,582 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:15,582 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:15,594 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:15,594 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 42 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 42 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:15,625 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:15,625 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 43 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 43 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:15,655 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-12-01 15:35:15,655 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:15,681 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-12-01 15:35:15,683 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:15,683 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:15,683 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:15,683 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:15,683 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-12-01 15:35:15,683 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:15,683 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:15,684 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:15,684 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-12-01 15:35:15,684 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:15,684 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:15,684 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,689 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,695 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,697 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,700 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,702 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:15,746 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:15,746 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:15,764 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:15,766 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:15,766 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:15,766 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:15,766 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:15,766 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:15,767 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:15,767 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:15,781 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:15,817 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:15,819 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:15,819 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:15,819 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:15,820 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:15,820 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:15,821 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:15,821 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:15,837 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-12-01 15:35:15,840 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-12-01 15:35:15,840 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:15,844 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-12-01 15:35:15,844 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-12-01 15:35:15,844 INFO L510 LassoAnalysis]: Proved termination. [2020-12-01 15:35:15,844 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:15,883 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-12-01 15:35:15,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:15,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:15,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-01 15:35:15,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:16,024 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,035 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,046 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:16,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-01 15:35:16,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:16,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 15:35:16,097 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-12-01 15:35:16,098 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-12-01 15:35:16,204 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114. Second operand 5 states. Result 348 states and 455 transitions. Complement of second has 14 states. [2020-12-01 15:35:16,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:16,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-12-01 15:35:16,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-12-01 15:35:16,205 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-12-01 15:35:16,206 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:16,206 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-12-01 15:35:16,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:16,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:16,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-01 15:35:16,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:16,361 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,374 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,388 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:16,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-01 15:35:16,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:16,440 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 15:35:16,442 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 3 loop predicates [2020-12-01 15:35:16,442 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-12-01 15:35:16,552 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114. Second operand 5 states. Result 348 states and 455 transitions. Complement of second has 14 states. [2020-12-01 15:35:16,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:16,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-12-01 15:35:16,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-12-01 15:35:16,554 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-12-01 15:35:16,554 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:16,554 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-12-01 15:35:16,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:16,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:16,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-01 15:35:16,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:16,673 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,682 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,701 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:16,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:16,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-01 15:35:16,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:16,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 15:35:16,763 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-12-01 15:35:16,764 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-12-01 15:35:16,900 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114. Second operand 5 states. Result 485 states and 616 transitions. Complement of second has 16 states. [2020-12-01 15:35:16,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:16,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-12-01 15:35:16,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-12-01 15:35:16,902 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-12-01 15:35:16,902 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:16,902 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 35 letters. Loop has 3 letters. [2020-12-01 15:35:16,903 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:16,903 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 6 letters. [2020-12-01 15:35:16,905 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:16,905 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 485 states and 616 transitions. [2020-12-01 15:35:16,913 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 26 [2020-12-01 15:35:16,920 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 485 states to 395 states and 526 transitions. [2020-12-01 15:35:16,920 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 129 [2020-12-01 15:35:16,921 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 136 [2020-12-01 15:35:16,921 INFO L73 IsDeterministic]: Start isDeterministic. Operand 395 states and 526 transitions. [2020-12-01 15:35:16,921 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:16,922 INFO L692 BuchiCegarLoop]: Abstraction has 395 states and 526 transitions. [2020-12-01 15:35:16,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states and 526 transitions. [2020-12-01 15:35:16,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 351. [2020-12-01 15:35:16,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-12-01 15:35:16,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 456 transitions. [2020-12-01 15:35:16,958 INFO L715 BuchiCegarLoop]: Abstraction has 351 states and 456 transitions. [2020-12-01 15:35:16,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 15:35:16,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-01 15:35:16,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-12-01 15:35:16,959 INFO L87 Difference]: Start difference. First operand 351 states and 456 transitions. Second operand 10 states. [2020-12-01 15:35:17,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 15:35:17,086 INFO L93 Difference]: Finished difference Result 378 states and 513 transitions. [2020-12-01 15:35:17,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-01 15:35:17,087 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 378 states and 513 transitions. [2020-12-01 15:35:17,098 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-12-01 15:35:17,100 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 378 states to 104 states and 142 transitions. [2020-12-01 15:35:17,101 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 98 [2020-12-01 15:35:17,101 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 98 [2020-12-01 15:35:17,101 INFO L73 IsDeterministic]: Start isDeterministic. Operand 104 states and 142 transitions. [2020-12-01 15:35:17,102 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:17,102 INFO L692 BuchiCegarLoop]: Abstraction has 104 states and 142 transitions. [2020-12-01 15:35:17,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states and 142 transitions. [2020-12-01 15:35:17,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 86. [2020-12-01 15:35:17,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-12-01 15:35:17,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 106 transitions. [2020-12-01 15:35:17,109 INFO L715 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-12-01 15:35:17,109 INFO L595 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-12-01 15:35:17,109 INFO L427 BuchiCegarLoop]: ======== Iteration 7============ [2020-12-01 15:35:17,109 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 86 states and 106 transitions. [2020-12-01 15:35:17,110 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-12-01 15:35:17,110 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:17,110 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:17,111 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:17,111 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-12-01 15:35:17,112 INFO L794 eck$LassoCheckResult]: Stem: 6179#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; 6180#L25 call main_#t~ret6 := rec2(main_~x~0);< 6185#rec2ENTRY ~j := #in~j; 6207#L18 assume !(~j <= 0); 6204#L20 call #t~ret3 := rec1(~j - 1);< 6206#rec1ENTRY ~i := #in~i; 6205#L12 assume !(~i <= 0); 6175#L14 call #t~ret0 := rec1(~i - 2);< 6187#rec1ENTRY ~i := #in~i; 6156#L12 assume !(~i <= 0); 6155#L14 [2020-12-01 15:35:17,112 INFO L796 eck$LassoCheckResult]: Loop: 6155#L14 call #t~ret0 := rec1(~i - 2);< 6154#rec1ENTRY ~i := #in~i; 6156#L12 assume !(~i <= 0); 6155#L14 [2020-12-01 15:35:17,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:17,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1371444593, now seen corresponding path program 3 times [2020-12-01 15:35:17,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:17,113 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207814831] [2020-12-01 15:35:17,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:17,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:17,125 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:17,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:17,130 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:17,132 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:17,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:17,133 INFO L82 PathProgramCache]: Analyzing trace with hash 54781, now seen corresponding path program 4 times [2020-12-01 15:35:17,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:17,135 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074201549] [2020-12-01 15:35:17,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:17,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:17,138 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:17,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:17,142 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:17,143 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:17,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:17,144 INFO L82 PathProgramCache]: Analyzing trace with hash 1318041775, now seen corresponding path program 4 times [2020-12-01 15:35:17,144 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:17,144 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346219017] [2020-12-01 15:35:17,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:17,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:17,152 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:17,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:17,158 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:17,162 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:17,197 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:17,197 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:17,198 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:17,198 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:17,198 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-12-01 15:35:17,198 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:17,198 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:17,198 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:17,198 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-12-01 15:35:17,198 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:17,198 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:17,200 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:17,208 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:17,211 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:17,214 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:17,216 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:17,255 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:17,255 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:17,263 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:17,263 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 48 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 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:17,301 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-12-01 15:35:17,301 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:27,681 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-12-01 15:35:27,684 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:27,684 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:27,684 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:27,684 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:27,684 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-12-01 15:35:27,684 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:27,684 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:27,684 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:27,684 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-12-01 15:35:27,684 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:27,684 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:27,685 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:27,698 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:27,701 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:27,703 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:27,705 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:27,749 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:27,749 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 49 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 49 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:27,764 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:27,765 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:27,766 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:27,766 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:27,766 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:27,766 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:27,767 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:27,767 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:27,786 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-12-01 15:35:27,790 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-12-01 15:35:27,790 INFO L444 ModelExtractionUtils]: 2 out of 4 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 50 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 50 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:27,793 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-12-01 15:35:27,793 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-12-01 15:35:27,793 INFO L510 LassoAnalysis]: Proved termination. [2020-12-01 15:35:27,793 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_~i) = 1*rec1_~i Supporting invariants [] [2020-12-01 15:35:27,811 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-12-01 15:35:27,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:27,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:27,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-01 15:35:27,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:27,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:27,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-01 15:35:27,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:27,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 15:35:27,901 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 3 loop predicates [2020-12-01 15:35:27,902 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 86 states and 106 transitions. cyclomatic complexity: 23 Second operand 4 states. [2020-12-01 15:35:27,952 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 86 states and 106 transitions. cyclomatic complexity: 23. Second operand 4 states. Result 100 states and 124 transitions. Complement of second has 11 states. [2020-12-01 15:35:27,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 1 stem states 3 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:27,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-12-01 15:35:27,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 13 transitions. [2020-12-01 15:35:27,954 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 3 letters. [2020-12-01 15:35:27,955 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:27,955 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 13 letters. Loop has 3 letters. [2020-12-01 15:35:27,956 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:27,956 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 6 letters. [2020-12-01 15:35:27,956 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:27,956 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 100 states and 124 transitions. [2020-12-01 15:35:27,958 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-12-01 15:35:27,960 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 100 states to 94 states and 117 transitions. [2020-12-01 15:35:27,961 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 83 [2020-12-01 15:35:27,961 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 84 [2020-12-01 15:35:27,961 INFO L73 IsDeterministic]: Start isDeterministic. Operand 94 states and 117 transitions. [2020-12-01 15:35:27,961 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:27,962 INFO L692 BuchiCegarLoop]: Abstraction has 94 states and 117 transitions. [2020-12-01 15:35:27,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states and 117 transitions. [2020-12-01 15:35:27,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2020-12-01 15:35:27,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-12-01 15:35:27,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 114 transitions. [2020-12-01 15:35:27,966 INFO L715 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-12-01 15:35:27,967 INFO L595 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-12-01 15:35:27,967 INFO L427 BuchiCegarLoop]: ======== Iteration 8============ [2020-12-01 15:35:27,967 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 114 transitions. [2020-12-01 15:35:27,968 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-12-01 15:35:27,968 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-12-01 15:35:27,968 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-12-01 15:35:27,970 INFO L853 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 15:35:27,970 INFO L854 BuchiCegarLoop]: Counterexample loop histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2020-12-01 15:35:27,971 INFO L794 eck$LassoCheckResult]: Stem: 6436#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; 6405#L25 call main_#t~ret6 := rec2(main_~x~0);< 6404#rec2ENTRY ~j := #in~j; 6406#L18 assume !(~j <= 0); 6439#L20 call #t~ret3 := rec1(~j - 1);< 6440#rec1ENTRY ~i := #in~i; 6461#L12 assume !(~i <= 0); 6424#L14 call #t~ret0 := rec1(~i - 2);< 6458#rec1ENTRY ~i := #in~i; 6475#L12 assume !(~i <= 0); 6408#L14 call #t~ret0 := rec1(~i - 2);< 6407#rec1ENTRY ~i := #in~i; 6409#L12 assume ~i <= 0;#res := 0; 6495#rec1FINAL assume true; 6493#rec1EXIT >#27#return; 6417#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6423#rec1ENTRY ~i := #in~i; 6489#L12 assume ~i <= 0;#res := 0; 6488#rec1FINAL assume true; 6466#rec1EXIT >#29#return; 6467#L14-2 call #t~ret2 := rec1(#t~ret1);< 6479#rec1ENTRY ~i := #in~i; 6485#L12 assume ~i <= 0;#res := 0; 6484#rec1FINAL assume true; 6477#rec1EXIT >#31#return; 6476#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret0;havoc #t~ret1; 6464#rec1FINAL assume true; 6465#rec1EXIT >#27#return; 6418#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6454#rec1ENTRY [2020-12-01 15:35:27,971 INFO L796 eck$LassoCheckResult]: Loop: 6454#rec1ENTRY ~i := #in~i; 6482#L12 assume !(~i <= 0); 6422#L14 call #t~ret0 := rec1(~i - 2);< 6437#rec1ENTRY ~i := #in~i; 6481#L12 assume !(~i <= 0); 6415#L14 call #t~ret0 := rec1(~i - 2);< 6438#rec1ENTRY ~i := #in~i; 6435#L12 assume ~i <= 0;#res := 0; 6414#rec1FINAL assume true; 6416#rec1EXIT >#27#return; 6417#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6423#rec1ENTRY ~i := #in~i; 6489#L12 assume ~i <= 0;#res := 0; 6488#rec1FINAL assume true; 6466#rec1EXIT >#29#return; 6467#L14-2 call #t~ret2 := rec1(#t~ret1);< 6479#rec1ENTRY ~i := #in~i; 6485#L12 assume ~i <= 0;#res := 0; 6484#rec1FINAL assume true; 6477#rec1EXIT >#31#return; 6476#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret0;havoc #t~ret1; 6464#rec1FINAL assume true; 6465#rec1EXIT >#27#return; 6419#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6454#rec1ENTRY [2020-12-01 15:35:27,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:27,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2020-12-01 15:35:27,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:27,972 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151373279] [2020-12-01 15:35:27,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:27,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:27,980 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:27,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:27,994 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:28,003 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:28,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:28,004 INFO L82 PathProgramCache]: Analyzing trace with hash -165506564, now seen corresponding path program 1 times [2020-12-01 15:35:28,004 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:28,004 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549055086] [2020-12-01 15:35:28,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:28,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:28,015 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:28,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 15:35:28,023 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 15:35:28,049 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 15:35:28,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:28,050 INFO L82 PathProgramCache]: Analyzing trace with hash 2126813793, now seen corresponding path program 2 times [2020-12-01 15:35:28,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 15:35:28,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955699825] [2020-12-01 15:35:28,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 15:35:28,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-12-01 15:35:28,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-01 15:35:28,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-12-01 15:35:28,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-12-01 15:35:28,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-12-01 15:35:28,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-01 15:35:28,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-12-01 15:35:28,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-12-01 15:35:28,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:28,153 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 24 proven. 29 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2020-12-01 15:35:28,154 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955699825] [2020-12-01 15:35:28,154 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273300100] [2020-12-01 15:35:28,154 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 15:35:28,198 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-01 15:35:28,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-01 15:35:28,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-01 15:35:28,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:28,254 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 109 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-01 15:35:28,255 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 15:35:28,255 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-12-01 15:35:28,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632745034] [2020-12-01 15:35:28,534 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:28,534 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:28,534 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:28,534 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:28,534 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-12-01 15:35:28,534 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,534 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:28,534 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:28,534 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-12-01 15:35:28,534 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:28,534 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:28,535 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,538 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,546 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,548 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,555 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,557 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,625 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:28,626 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-12-01 15:35:28,643 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:28,643 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,657 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:28,658 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret0=0} Honda state: {rec1_#t~ret0=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 53 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 53 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,686 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:28,686 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:28,688 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:28,688 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#res=0} Honda state: {rec1_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 54 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 54 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,709 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:28,709 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:28,719 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-12-01 15:35:28,720 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 55 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 55 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,742 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-12-01 15:35:28,742 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 56 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 56 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,788 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-12-01 15:35:28,788 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-12-01 15:35:28,793 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-12-01 15:35:28,811 INFO L210 LassoAnalysis]: Preferences: [2020-12-01 15:35:28,811 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-12-01 15:35:28,811 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-12-01 15:35:28,811 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-12-01 15:35:28,811 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-12-01 15:35:28,811 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,811 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-12-01 15:35:28,811 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-12-01 15:35:28,811 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-12-01 15:35:28,812 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-12-01 15:35:28,812 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-12-01 15:35:28,812 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,814 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,816 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,822 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,824 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,826 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-12-01 15:35:28,856 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-12-01 15:35:28,856 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 57 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 57 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,882 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:28,883 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:28,883 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:28,884 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:28,884 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:28,884 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:28,884 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:28,884 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:28,901 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 58 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,928 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:28,929 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:28,929 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:28,929 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:28,929 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:28,929 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:28,930 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:28,930 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:28,935 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 59 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 59 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,955 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-12-01 15:35:28,956 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-12-01 15:35:28,956 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-12-01 15:35:28,957 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-12-01 15:35:28,957 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-12-01 15:35:28,957 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-12-01 15:35:28,958 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-12-01 15:35:28,958 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-12-01 15:35:28,960 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-12-01 15:35:28,965 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-12-01 15:35:28,965 INFO L444 ModelExtractionUtils]: 0 out of 3 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3b612f36-ac29-4d7a-bbae-b759e777580d/bin/uautomizer/z3 Starting monitored process 60 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 60 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-12-01 15:35:28,969 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-12-01 15:35:28,969 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-12-01 15:35:28,969 INFO L510 LassoAnalysis]: Proved termination. [2020-12-01 15:35:28,969 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-12-01 15:35:28,987 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-12-01 15:35:29,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:29,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:29,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-01 15:35:29,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:29,094 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:29,103 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:29,116 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:29,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:29,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-01 15:35:29,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:29,340 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-01 15:35:29,341 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 9 loop predicates [2020-12-01 15:35:29,341 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-12-01 15:35:29,445 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26. Second operand 11 states. Result 100 states and 122 transitions. Complement of second has 7 states. [2020-12-01 15:35:29,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:29,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-01 15:35:29,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-12-01 15:35:29,447 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-12-01 15:35:29,447 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:29,447 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-12-01 15:35:29,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:29,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:29,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-01 15:35:29,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:29,550 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:29,565 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:29,574 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:29,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:29,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-01 15:35:29,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:29,842 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-01 15:35:29,844 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 9 loop predicates [2020-12-01 15:35:29,844 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-12-01 15:35:29,942 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26. Second operand 11 states. Result 100 states and 122 transitions. Complement of second has 7 states. [2020-12-01 15:35:29,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:29,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-01 15:35:29,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-12-01 15:35:29,945 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-12-01 15:35:29,945 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:29,946 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-12-01 15:35:29,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:30,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:30,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-01 15:35:30,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:30,066 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:30,074 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:30,081 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:30,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:30,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-01 15:35:30,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:30,297 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-01 15:35:30,297 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 9 loop predicates [2020-12-01 15:35:30,297 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-12-01 15:35:30,696 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26. Second operand 11 states. Result 257 states and 303 transitions. Complement of second has 31 states. [2020-12-01 15:35:30,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 11 states 2 stem states 8 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:30,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-01 15:35:30,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 38 transitions. [2020-12-01 15:35:30,698 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 38 transitions. Stem has 29 letters. Loop has 24 letters. [2020-12-01 15:35:30,699 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:30,699 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-12-01 15:35:30,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 15:35:30,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:30,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-01 15:35:30,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:30,812 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:30,819 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:30,830 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-01 15:35:30,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 15:35:30,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-01 15:35:30,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 15:35:31,056 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-01 15:35:31,057 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and with honda bouncer for loop.2 stem predicates 9 loop predicates [2020-12-01 15:35:31,057 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-12-01 15:35:31,677 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26. Second operand 11 states. Result 409 states and 515 transitions. Complement of second has 80 states. [2020-12-01 15:35:31,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 15 states 2 stem states 12 non-accepting loop states 1 accepting loop states [2020-12-01 15:35:31,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-01 15:35:31,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 49 transitions. [2020-12-01 15:35:31,679 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 24 letters. [2020-12-01 15:35:31,679 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:31,680 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 53 letters. Loop has 24 letters. [2020-12-01 15:35:31,680 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:31,681 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 48 letters. [2020-12-01 15:35:31,682 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-12-01 15:35:31,682 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 409 states and 515 transitions. [2020-12-01 15:35:31,690 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 62 [2020-12-01 15:35:31,695 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 409 states to 253 states and 345 transitions. [2020-12-01 15:35:31,695 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 154 [2020-12-01 15:35:31,695 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 164 [2020-12-01 15:35:31,695 INFO L73 IsDeterministic]: Start isDeterministic. Operand 253 states and 345 transitions. [2020-12-01 15:35:31,696 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-12-01 15:35:31,696 INFO L692 BuchiCegarLoop]: Abstraction has 253 states and 345 transitions. [2020-12-01 15:35:31,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states and 345 transitions. [2020-12-01 15:35:31,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 216. [2020-12-01 15:35:31,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-12-01 15:35:31,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 270 transitions. [2020-12-01 15:35:31,706 INFO L715 BuchiCegarLoop]: Abstraction has 216 states and 270 transitions. [2020-12-01 15:35:31,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 15:35:31,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-01 15:35:31,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-12-01 15:35:31,707 INFO L87 Difference]: Start difference. First operand 216 states and 270 transitions. Second operand 8 states. [2020-12-01 15:35:31,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 15:35:31,777 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-12-01 15:35:31,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-01 15:35:31,778 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 35 states and 37 transitions. [2020-12-01 15:35:31,779 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-12-01 15:35:31,779 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 35 states to 0 states and 0 transitions. [2020-12-01 15:35:31,779 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-12-01 15:35:31,779 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-12-01 15:35:31,779 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-12-01 15:35:31,779 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-12-01 15:35:31,780 INFO L692 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-01 15:35:31,780 INFO L715 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-01 15:35:31,780 INFO L595 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-01 15:35:31,780 INFO L427 BuchiCegarLoop]: ======== Iteration 9============ [2020-12-01 15:35:31,780 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2020-12-01 15:35:31,780 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-12-01 15:35:31,780 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2020-12-01 15:35:31,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 01.12 03:35:31 BoogieIcfgContainer [2020-12-01 15:35:31,786 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-12-01 15:35:31,789 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-01 15:35:31,789 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-01 15:35:31,789 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-01 15:35:31,790 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 03:35:04" (3/4) ... [2020-12-01 15:35:31,792 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-12-01 15:35:31,793 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-01 15:35:31,794 INFO L168 Benchmark]: Toolchain (without parser) took 27765.64 ms. Allocated memory was 86.0 MB in the beginning and 151.0 MB in the end (delta: 65.0 MB). Free memory was 55.3 MB in the beginning and 122.8 MB in the end (delta: -67.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 15:35:31,794 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 86.0 MB. Free memory was 43.4 MB in the beginning and 43.4 MB in the end (delta: 31.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 15:35:31,795 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.47 ms. Allocated memory is still 86.0 MB. Free memory was 55.2 MB in the beginning and 65.9 MB in the end (delta: -10.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-01 15:35:31,795 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.53 ms. Allocated memory is still 86.0 MB. Free memory was 65.9 MB in the beginning and 64.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 15:35:31,796 INFO L168 Benchmark]: Boogie Preprocessor took 18.49 ms. Allocated memory is still 86.0 MB. Free memory was 64.5 MB in the beginning and 63.7 MB in the end (delta: 792.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 15:35:31,796 INFO L168 Benchmark]: RCFGBuilder took 249.27 ms. Allocated memory is still 86.0 MB. Free memory was 63.7 MB in the beginning and 54.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-01 15:35:31,798 INFO L168 Benchmark]: BuchiAutomizer took 27191.25 ms. Allocated memory was 86.0 MB in the beginning and 151.0 MB in the end (delta: 65.0 MB). Free memory was 54.4 MB in the beginning and 122.8 MB in the end (delta: -68.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 15:35:31,799 INFO L168 Benchmark]: Witness Printer took 4.09 ms. Allocated memory is still 151.0 MB. Free memory is still 122.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 15:35:31,800 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 86.0 MB. Free memory was 43.4 MB in the beginning and 43.4 MB in the end (delta: 31.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 246.47 ms. Allocated memory is still 86.0 MB. Free memory was 55.2 MB in the beginning and 65.9 MB in the end (delta: -10.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 35.53 ms. Allocated memory is still 86.0 MB. Free memory was 65.9 MB in the beginning and 64.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.49 ms. Allocated memory is still 86.0 MB. Free memory was 64.5 MB in the beginning and 63.7 MB in the end (delta: 792.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 249.27 ms. Allocated memory is still 86.0 MB. Free memory was 63.7 MB in the beginning and 54.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * BuchiAutomizer took 27191.25 ms. Allocated memory was 86.0 MB in the beginning and 151.0 MB in the end (delta: 65.0 MB). Free memory was 54.4 MB in the beginning and 122.8 MB in the end (delta: -68.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 4.09 ms. Allocated memory is still 151.0 MB. Free memory is still 122.8 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: Constructed decomposition of program Your program was decomposed into 12 terminating modules (5 trivial, 5 deterministic, 2 nondeterministic). One deterministic module has affine ranking function \old(j) and consists of 11 locations. One deterministic module has affine ranking function \old(i) and consists of 4 locations. One deterministic module has affine ranking function \old(i) and consists of 5 locations. One deterministic module has affine ranking function org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@461866ee and consists of 11 locations. One deterministic module has affine ranking function i and consists of 5 locations. One nondeterministic module has affine ranking function \old(i) and consists of 5 locations. One nondeterministic module has affine ranking function \old(i) and consists of 15 locations. 5 modules have a trivial ranking function, the largest among these consists of 12 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 27.1s and 9 iterations. TraceHistogramMax:5. Analysis of lassos took 19.3s. Construction of modules took 1.1s. Büchi inclusion checks took 5.9s. Highest rank in rank-based complementation 3. Minimization of det autom 1. Minimization of nondet autom 11. Automata minimization 0.2s AutomataMinimizationTime, 11 MinimizatonAttempts, 249 StatesRemovedByMinimization, 11 NontrivialMinimizations. Non-live state removal took 0.2s Buchi closure took 0.0s. Biggest automaton had 314 states and ocurred in iteration 5. Nontrivial modules had stage [5, 0, 1, 1, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 38/58 HoareTripleCheckerStatistics: 288 SDtfs, 343 SDslu, 514 SDs, 0 SdLazy, 932 SolverSat, 328 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time LassoAnalysisResults: nont0 unkn0 SFLI1 SFLT3 conc0 concLT3 SILN0 SILU0 SILI0 SILT1 lasso0 LassoPreprocessingBenchmarks: Lassos: inital12 mio100 ax100 hnf97 lsp100 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq157 hnf92 smp100 dnf100 smp100 tf112 neg100 sie110 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 26ms VariablesStem: 0 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 0 MotzkinApplications: 2 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 14 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 7 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 13.8s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...