./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/config/AutomizerTermination.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c -s /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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-a4ecdab [2020-11-29 18:33:30,060 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-29 18:33:30,064 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-29 18:33:30,138 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-29 18:33:30,160 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-29 18:33:30,162 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-29 18:33:30,164 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-29 18:33:30,168 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-29 18:33:30,177 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-29 18:33:30,179 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-29 18:33:30,181 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-29 18:33:30,183 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-29 18:33:30,184 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-29 18:33:30,186 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-29 18:33:30,188 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-29 18:33:30,190 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-29 18:33:30,191 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-29 18:33:30,193 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-29 18:33:30,196 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-29 18:33:30,199 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-29 18:33:30,202 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-29 18:33:30,205 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-29 18:33:30,207 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-29 18:33:30,208 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-29 18:33:30,214 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-29 18:33:30,214 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-29 18:33:30,215 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-29 18:33:30,217 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-29 18:33:30,218 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-29 18:33:30,219 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-29 18:33:30,220 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-29 18:33:30,221 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-29 18:33:30,223 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-29 18:33:30,224 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-29 18:33:30,226 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-29 18:33:30,226 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-29 18:33:30,227 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-29 18:33:30,228 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-29 18:33:30,228 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-29 18:33:30,230 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-29 18:33:30,231 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-29 18:33:30,232 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-11-29 18:33:30,265 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-29 18:33:30,266 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-29 18:33:30,268 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-29 18:33:30,268 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-29 18:33:30,268 INFO L138 SettingsManager]: * Use SBE=true [2020-11-29 18:33:30,269 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-11-29 18:33:30,269 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-11-29 18:33:30,269 INFO L138 SettingsManager]: * Use old map elimination=false [2020-11-29 18:33:30,270 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-11-29 18:33:30,270 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-11-29 18:33:30,270 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-11-29 18:33:30,270 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-29 18:33:30,271 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-29 18:33:30,271 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-29 18:33:30,271 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-29 18:33:30,272 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-11-29 18:33:30,272 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-11-29 18:33:30,272 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-11-29 18:33:30,272 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-29 18:33:30,273 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-11-29 18:33:30,273 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-29 18:33:30,273 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-11-29 18:33:30,274 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-29 18:33:30,274 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-29 18:33:30,274 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-11-29 18:33:30,275 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-29 18:33:30,275 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-29 18:33:30,275 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-29 18:33:30,275 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-11-29 18:33:30,277 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-11-29 18:33:30,277 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cb528549fa76ae8087cf7043645dfa20323a0116 [2020-11-29 18:33:30,636 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-29 18:33:30,692 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-29 18:33:30,698 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-29 18:33:30,701 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-29 18:33:30,702 INFO L275 PluginConnector]: CDTParser initialized [2020-11-29 18:33:30,704 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/../../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-11-29 18:33:30,806 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/data/8e30aab2f/18b5e2fd93884410985af0517102162f/FLAG4d3a7dc38 [2020-11-29 18:33:31,480 INFO L306 CDTParser]: Found 1 translation units. [2020-11-29 18:33:31,481 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-11-29 18:33:31,490 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/data/8e30aab2f/18b5e2fd93884410985af0517102162f/FLAG4d3a7dc38 [2020-11-29 18:33:31,861 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/bin/uautomizer/data/8e30aab2f/18b5e2fd93884410985af0517102162f [2020-11-29 18:33:31,870 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-29 18:33:31,877 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-29 18:33:31,880 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-29 18:33:31,881 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-29 18:33:31,886 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-29 18:33:31,888 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 06:33:31" (1/1) ... [2020-11-29 18:33:31,893 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1be20181 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:31, skipping insertion in model container [2020-11-29 18:33:31,894 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 06:33:31" (1/1) ... [2020-11-29 18:33:31,907 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-29 18:33:31,930 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-29 18:33:32,195 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 18:33:32,209 INFO L203 MainTranslator]: Completed pre-run [2020-11-29 18:33:32,253 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 18:33:32,276 INFO L208 MainTranslator]: Completed translation [2020-11-29 18:33:32,277 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32 WrapperNode [2020-11-29 18:33:32,277 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-29 18:33:32,279 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-29 18:33:32,280 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-29 18:33:32,280 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-29 18:33:32,294 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,300 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,325 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-29 18:33:32,329 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-29 18:33:32,329 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-29 18:33:32,330 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-29 18:33:32,341 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,343 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,344 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,345 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,349 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,353 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,355 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... [2020-11-29 18:33:32,357 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-29 18:33:32,359 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-29 18:33:32,360 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-29 18:33:32,360 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-29 18:33:32,362 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:32,457 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-11-29 18:33:32,457 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-11-29 18:33:32,458 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-11-29 18:33:32,458 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-11-29 18:33:32,458 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-29 18:33:32,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-29 18:33:32,748 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-29 18:33:32,748 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-11-29 18:33:32,750 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 06:33:32 BoogieIcfgContainer [2020-11-29 18:33:32,750 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-29 18:33:32,752 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-11-29 18:33:32,752 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-11-29 18:33:32,763 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-11-29 18:33:32,764 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-29 18:33:32,764 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 29.11 06:33:31" (1/3) ... [2020-11-29 18:33:32,765 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@7466f42f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 29.11 06:33:32, skipping insertion in model container [2020-11-29 18:33:32,766 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-29 18:33:32,766 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:33:32" (2/3) ... [2020-11-29 18:33:32,766 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@7466f42f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 29.11 06:33:32, skipping insertion in model container [2020-11-29 18:33:32,766 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-29 18:33:32,767 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 06:33:32" (3/3) ... [2020-11-29 18:33:32,768 INFO L373 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1b.c [2020-11-29 18:33:32,871 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-11-29 18:33:32,872 INFO L360 BuchiCegarLoop]: Hoare is false [2020-11-29 18:33:32,872 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-11-29 18:33:32,872 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-29 18:33:32,872 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-29 18:33:32,872 INFO L364 BuchiCegarLoop]: Difference is false [2020-11-29 18:33:32,872 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-29 18:33:32,873 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-11-29 18:33:32,897 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-11-29 18:33:32,931 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:32,932 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:32,932 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:32,943 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-29 18:33:32,943 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:32,944 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-11-29 18:33:32,944 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-11-29 18:33:32,953 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:32,953 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:32,954 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:32,954 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-29 18:33:32,955 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:32,966 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 [2020-11-29 18:33:32,968 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 [2020-11-29 18:33:32,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:32,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2020-11-29 18:33:32,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:32,999 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866015989] [2020-11-29 18:33:33,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:33,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:33,100 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:33,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:33,119 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:33,147 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:33,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:33,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2020-11-29 18:33:33,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:33,156 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219409844] [2020-11-29 18:33:33,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:33,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:33,198 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:33,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:33,218 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:33,224 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:33,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:33,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1371489668, now seen corresponding path program 1 times [2020-11-29 18:33:33,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:33,241 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610896803] [2020-11-29 18:33:33,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:33,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:33,258 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:33,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:33,274 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:33,280 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:33,612 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:33,613 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:33,613 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:33,613 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:33,614 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:33:33,614 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:33,614 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:33,614 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:33,614 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-11-29 18:33:33,615 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:33,615 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:33,640 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:33,650 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:33,656 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:33,661 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:33,666 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:33,785 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:33,786 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:33,803 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:33,803 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 [2020-11-29 18:33:33,817 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:33,818 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:33,872 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:33,872 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 [2020-11-29 18:33:33,877 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:33,877 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:33,933 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:33,933 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 [2020-11-29 18:33:33,941 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:33,942 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:33,998 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:33,998 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:34,004 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:34,004 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:34,049 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:34,049 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:34,094 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:33:34,094 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:34,104 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:33:34,151 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:34,151 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:34,152 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:34,152 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:34,152 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:33:34,152 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:34,152 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:34,152 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:34,153 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-11-29 18:33:34,153 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:34,153 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:34,155 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:34,170 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:34,174 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:34,179 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:34,191 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:34,256 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:34,262 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:34,271 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 [2020-11-29 18:33:34,274 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:34,274 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:34,275 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:34,275 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:34,275 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:34,280 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:34,280 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 [2020-11-29 18:33:34,287 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:34,344 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 [2020-11-29 18:33:34,346 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:34,347 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:34,347 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:34,347 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:34,347 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:34,349 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:34,350 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:34,353 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:34,413 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 [2020-11-29 18:33:34,415 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:34,415 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:34,416 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:34,416 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:34,416 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:34,417 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:34,417 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:34,420 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:34,466 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 [2020-11-29 18:33:34,468 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:34,468 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:34,468 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:34,468 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:34,469 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:34,471 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:34,471 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:34,476 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:33:34,490 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-29 18:33:34,490 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:34,500 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:33:34,500 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:33:34,500 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:33:34,501 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 [2020-11-29 18:33:34,552 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:33:34,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:34,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:34,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 18:33:34,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:34,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:34,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-29 18:33:34,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:34,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:33:34,895 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 [2020-11-29 18:33:34,897 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 21 states. Second operand 7 states. [2020-11-29 18:33:35,702 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. [2020-11-29 18:33:35,706 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 [2020-11-29 18:33:35,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-11-29 18:33:35,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 57 transitions. [2020-11-29 18:33:35,713 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 8 letters. [2020-11-29 18:33:35,715 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:35,716 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 10 letters. Loop has 8 letters. [2020-11-29 18:33:35,716 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:35,716 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 16 letters. [2020-11-29 18:33:35,717 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:35,718 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 194 states and 279 transitions. [2020-11-29 18:33:35,738 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:35,753 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 194 states to 82 states and 120 transitions. [2020-11-29 18:33:35,777 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 35 [2020-11-29 18:33:35,778 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 38 [2020-11-29 18:33:35,779 INFO L73 IsDeterministic]: Start isDeterministic. Operand 82 states and 120 transitions. [2020-11-29 18:33:35,780 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:35,780 INFO L691 BuchiCegarLoop]: Abstraction has 82 states and 120 transitions. [2020-11-29 18:33:35,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states and 120 transitions. [2020-11-29 18:33:35,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-11-29 18:33:35,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-11-29 18:33:35,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 83 transitions. [2020-11-29 18:33:35,833 INFO L714 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-11-29 18:33:35,833 INFO L594 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-11-29 18:33:35,833 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-11-29 18:33:35,833 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 55 states and 83 transitions. [2020-11-29 18:33:35,836 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:35,836 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:35,837 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:35,837 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:35,838 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-29 18:33:35,838 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 [2020-11-29 18:33:35,838 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 [2020-11-29 18:33:35,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:35,847 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2020-11-29 18:33:35,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:35,848 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958436188] [2020-11-29 18:33:35,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:35,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:35,862 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:35,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:35,880 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:35,890 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:35,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:35,891 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2020-11-29 18:33:35,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:35,892 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003965339] [2020-11-29 18:33:35,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:35,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:35,908 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:35,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:35,911 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:35,913 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:35,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:35,914 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2020-11-29 18:33:35,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:35,914 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055271058] [2020-11-29 18:33:35,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:35,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:35,937 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:35,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:35,946 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:35,954 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:36,012 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:36,012 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:36,012 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:36,012 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:36,013 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:33:36,013 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,013 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:36,013 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:36,013 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-11-29 18:33:36,013 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:36,013 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:36,015 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,028 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,033 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,038 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,044 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,054 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,148 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:36,148 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:36,155 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:36,155 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 [2020-11-29 18:33:36,161 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:36,161 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:36,223 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:36,224 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,229 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:36,229 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:36,288 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:36,288 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:36,293 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:36,293 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:36,347 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:36,347 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,351 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:36,352 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,401 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:36,401 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:36,405 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:36,405 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,436 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:36,436 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,480 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:33:36,480 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:36,529 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:33:36,531 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:36,532 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:36,532 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:36,532 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:36,532 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:33:36,532 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,532 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:36,532 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:36,532 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-11-29 18:33:36,532 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:36,532 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:36,534 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,558 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,567 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,572 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,576 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,588 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:36,659 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:36,659 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:36,668 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 [2020-11-29 18:33:36,670 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:36,671 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:36,671 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:36,671 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:36,671 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:36,672 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:36,672 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:36,674 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:36,711 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 [2020-11-29 18:33:36,712 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:36,713 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:36,713 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:36,713 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:36,713 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:36,714 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:36,714 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:36,716 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:36,754 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 [2020-11-29 18:33:36,756 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:36,757 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:36,757 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:36,757 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:36,757 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:36,758 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:36,758 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:36,761 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:36,794 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 [2020-11-29 18:33:36,797 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:36,797 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:36,797 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:36,798 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:36,798 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:36,799 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:36,799 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:36,815 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:36,851 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 [2020-11-29 18:33:36,853 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:36,854 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:36,854 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:36,854 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:36,854 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:36,856 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:36,856 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,859 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:33:36,863 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-29 18:33:36,863 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:36,873 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:33:36,873 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:33:36,873 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:33:36,873 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:36,920 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:33:37,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:37,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:37,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-29 18:33:37,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:37,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:37,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-29 18:33:37,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:37,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:33:37,123 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 [2020-11-29 18:33:37,123 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 55 states and 83 transitions. cyclomatic complexity: 32 Second operand 4 states. [2020-11-29 18:33:37,218 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. [2020-11-29 18:33:37,220 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 [2020-11-29 18:33:37,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-11-29 18:33:37,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 17 transitions. [2020-11-29 18:33:37,222 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 3 letters. [2020-11-29 18:33:37,222 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:37,223 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 11 letters. Loop has 3 letters. [2020-11-29 18:33:37,223 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:37,223 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 6 letters. [2020-11-29 18:33:37,224 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:37,224 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 105 states and 149 transitions. [2020-11-29 18:33:37,230 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:37,236 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 105 states to 93 states and 137 transitions. [2020-11-29 18:33:37,237 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 37 [2020-11-29 18:33:37,237 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 39 [2020-11-29 18:33:37,238 INFO L73 IsDeterministic]: Start isDeterministic. Operand 93 states and 137 transitions. [2020-11-29 18:33:37,239 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:37,240 INFO L691 BuchiCegarLoop]: Abstraction has 93 states and 137 transitions. [2020-11-29 18:33:37,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states and 137 transitions. [2020-11-29 18:33:37,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2020-11-29 18:33:37,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-11-29 18:33:37,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 129 transitions. [2020-11-29 18:33:37,265 INFO L714 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-11-29 18:33:37,265 INFO L594 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-11-29 18:33:37,265 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-11-29 18:33:37,265 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 89 states and 129 transitions. [2020-11-29 18:33:37,268 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:37,268 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:37,268 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:37,269 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:37,270 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-29 18:33:37,270 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 [2020-11-29 18:33:37,270 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 [2020-11-29 18:33:37,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:37,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2020-11-29 18:33:37,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:37,274 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304924763] [2020-11-29 18:33:37,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:37,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:37,296 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:37,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:37,308 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:37,311 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:37,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:37,312 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2020-11-29 18:33:37,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:37,313 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211188884] [2020-11-29 18:33:37,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:37,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:37,317 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:37,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:37,321 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:37,322 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:37,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:37,323 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2020-11-29 18:33:37,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:37,323 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565055742] [2020-11-29 18:33:37,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:37,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:37,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-29 18:33:37,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:37,468 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-29 18:33:37,469 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565055742] [2020-11-29 18:33:37,469 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 18:33:37,470 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-29 18:33:37,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661447746] [2020-11-29 18:33:37,583 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:37,583 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:37,583 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:37,583 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:37,583 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:33:37,583 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:37,583 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:37,584 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:37,584 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-11-29 18:33:37,584 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:37,584 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:37,585 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,591 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,602 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,606 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,615 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,619 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,693 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:37,694 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:37,705 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:37,705 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 [2020-11-29 18:33:37,710 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:37,710 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:37,761 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:37,761 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:37,820 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:33:37,820 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 [2020-11-29 18:33:37,883 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:33:37,886 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:37,886 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:37,886 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:37,886 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:37,886 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:33:37,886 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:37,887 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:37,887 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:37,887 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-11-29 18:33:37,887 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:37,887 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:37,888 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,894 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,904 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,910 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,916 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,920 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:37,984 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:37,985 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:37,994 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 [2020-11-29 18:33:37,996 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:37,997 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:37,997 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:37,997 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:37,997 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:37,998 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:37,999 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 [2020-11-29 18:33:38,001 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:38,048 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 [2020-11-29 18:33:38,050 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:38,050 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:38,050 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:38,050 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:38,050 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:38,052 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:38,052 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:38,055 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:33:38,064 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-29 18:33:38,064 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:38,068 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:33:38,068 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:33:38,068 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:33:38,069 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:38,115 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:33:38,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:38,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:38,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-29 18:33:38,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:38,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:38,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-29 18:33:38,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:38,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:33:38,322 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 [2020-11-29 18:33:38,323 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 89 states and 129 transitions. cyclomatic complexity: 47 Second operand 5 states. [2020-11-29 18:33:38,490 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. [2020-11-29 18:33:38,497 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 [2020-11-29 18:33:38,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-29 18:33:38,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 19 transitions. [2020-11-29 18:33:38,499 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 3 letters. [2020-11-29 18:33:38,499 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:38,499 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 16 letters. Loop has 3 letters. [2020-11-29 18:33:38,500 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:38,500 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 6 letters. [2020-11-29 18:33:38,500 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:38,501 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 134 states and 193 transitions. [2020-11-29 18:33:38,506 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:38,519 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 134 states to 122 states and 181 transitions. [2020-11-29 18:33:38,519 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 48 [2020-11-29 18:33:38,520 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2020-11-29 18:33:38,520 INFO L73 IsDeterministic]: Start isDeterministic. Operand 122 states and 181 transitions. [2020-11-29 18:33:38,520 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:38,520 INFO L691 BuchiCegarLoop]: Abstraction has 122 states and 181 transitions. [2020-11-29 18:33:38,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states and 181 transitions. [2020-11-29 18:33:38,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 113. [2020-11-29 18:33:38,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-11-29 18:33:38,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 165 transitions. [2020-11-29 18:33:38,539 INFO L714 BuchiCegarLoop]: Abstraction has 113 states and 165 transitions. [2020-11-29 18:33:38,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 18:33:38,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 18:33:38,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-29 18:33:38,544 INFO L87 Difference]: Start difference. First operand 113 states and 165 transitions. Second operand 6 states. [2020-11-29 18:33:38,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 18:33:38,621 INFO L93 Difference]: Finished difference Result 123 states and 175 transitions. [2020-11-29 18:33:38,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-29 18:33:38,623 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 123 states and 175 transitions. [2020-11-29 18:33:38,627 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2020-11-29 18:33:38,639 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 123 states to 121 states and 173 transitions. [2020-11-29 18:33:38,643 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 55 [2020-11-29 18:33:38,645 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 55 [2020-11-29 18:33:38,646 INFO L73 IsDeterministic]: Start isDeterministic. Operand 121 states and 173 transitions. [2020-11-29 18:33:38,646 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:38,646 INFO L691 BuchiCegarLoop]: Abstraction has 121 states and 173 transitions. [2020-11-29 18:33:38,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states and 173 transitions. [2020-11-29 18:33:38,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 101. [2020-11-29 18:33:38,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-11-29 18:33:38,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 143 transitions. [2020-11-29 18:33:38,671 INFO L714 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-11-29 18:33:38,672 INFO L594 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-11-29 18:33:38,672 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-11-29 18:33:38,672 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 101 states and 143 transitions. [2020-11-29 18:33:38,675 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2020-11-29 18:33:38,675 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:38,676 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:38,678 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:38,679 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:38,679 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 [2020-11-29 18:33:38,679 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 [2020-11-29 18:33:38,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:38,680 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2020-11-29 18:33:38,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:38,681 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157511547] [2020-11-29 18:33:38,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:38,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:38,698 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:38,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:38,721 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:38,724 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:38,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:38,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2020-11-29 18:33:38,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:38,725 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274135045] [2020-11-29 18:33:38,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:38,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:38,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 18:33:38,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:38,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-11-29 18:33:38,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:38,831 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-29 18:33:38,831 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274135045] [2020-11-29 18:33:38,831 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820293602] [2020-11-29 18:33:38,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:38,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:38,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-29 18:33:38,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:38,908 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:33:38,911 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-11-29 18:33:38,911 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2020-11-29 18:33:38,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289989559] [2020-11-29 18:33:38,912 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-11-29 18:33:38,913 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 18:33:38,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 18:33:38,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-29 18:33:38,914 INFO L87 Difference]: Start difference. First operand 101 states and 143 transitions. cyclomatic complexity: 49 Second operand 6 states. [2020-11-29 18:33:38,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 18:33:38,998 INFO L93 Difference]: Finished difference Result 117 states and 161 transitions. [2020-11-29 18:33:38,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-29 18:33:39,000 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 117 states and 161 transitions. [2020-11-29 18:33:39,003 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:39,008 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 117 states to 117 states and 161 transitions. [2020-11-29 18:33:39,008 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 53 [2020-11-29 18:33:39,009 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 53 [2020-11-29 18:33:39,009 INFO L73 IsDeterministic]: Start isDeterministic. Operand 117 states and 161 transitions. [2020-11-29 18:33:39,009 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:39,009 INFO L691 BuchiCegarLoop]: Abstraction has 117 states and 161 transitions. [2020-11-29 18:33:39,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states and 161 transitions. [2020-11-29 18:33:39,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2020-11-29 18:33:39,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-11-29 18:33:39,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 157 transitions. [2020-11-29 18:33:39,044 INFO L714 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-11-29 18:33:39,044 INFO L594 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-11-29 18:33:39,044 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-11-29 18:33:39,045 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 113 states and 157 transitions. [2020-11-29 18:33:39,047 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-29 18:33:39,049 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:39,050 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:39,052 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:39,053 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:39,054 INFO L794 eck$LassoCheckResult]: Stem: 1445#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1446#L25 call main_#t~ret6 := rec2(main_~x~0);< 1458#rec2ENTRY ~j := #in~j; 1471#L18 assume !(~j <= 0); 1422#L20 call #t~ret3 := rec1(~j - 1);< 1470#rec1ENTRY ~i := #in~i; 1469#L12 assume !(~i <= 0); 1418#L14 call #t~ret0 := rec1(~i - 2);< 1467#rec1ENTRY ~i := #in~i; 1440#L12 assume ~i <= 0;#res := 0; 1417#rec1FINAL assume true; 1419#rec1EXIT >#27#return; 1410#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1441#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1434#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret1;havoc #t~ret2; 1435#rec1FINAL assume true; 1464#rec1EXIT >#33#return; 1404#L20-1 [2020-11-29 18:33:39,054 INFO L796 eck$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~ret0;havoc #t~ret1;havoc #t~ret2; 1475#rec1FINAL assume true; 1461#rec1EXIT >#33#return; 1404#L20-1 [2020-11-29 18:33:39,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:39,055 INFO L82 PathProgramCache]: Analyzing trace with hash -790062692, now seen corresponding path program 1 times [2020-11-29 18:33:39,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:39,056 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488262787] [2020-11-29 18:33:39,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:39,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:39,075 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:39,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:39,101 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:39,105 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:39,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:39,106 INFO L82 PathProgramCache]: Analyzing trace with hash 125202860, now seen corresponding path program 1 times [2020-11-29 18:33:39,106 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:39,106 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737182837] [2020-11-29 18:33:39,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:39,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:39,117 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:39,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:39,126 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:39,130 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:39,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:39,135 INFO L82 PathProgramCache]: Analyzing trace with hash -2019382713, now seen corresponding path program 1 times [2020-11-29 18:33:39,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:39,136 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410332548] [2020-11-29 18:33:39,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:39,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-29 18:33:39,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-29 18:33:39,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-29 18:33:39,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-29 18:33:39,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-11-29 18:33:39,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-29 18:33:39,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-29 18:33:39,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-29 18:33:39,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,397 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-11-29 18:33:39,397 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410332548] [2020-11-29 18:33:39,397 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275891789] [2020-11-29 18:33:39,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:39,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:39,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-29 18:33:39,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:39,563 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-11-29 18:33:39,563 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 18:33:39,563 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-11-29 18:33:39,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887206512] [2020-11-29 18:33:39,812 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2020-11-29 18:33:39,960 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:39,960 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:39,960 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:39,960 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:39,960 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:33:39,960 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:39,960 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:39,960 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:39,960 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-11-29 18:33:39,961 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:39,961 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:39,962 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:39,984 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:39,989 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:40,055 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:40,055 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:40,066 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:40,066 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:40,100 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:33:40,100 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:42,495 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:33:42,498 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:42,498 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:42,498 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:42,498 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:42,498 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:33:42,498 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:42,499 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:42,499 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:42,499 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-11-29 18:33:42,499 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:42,499 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:42,500 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:42,504 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:42,508 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:42,593 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:42,593 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:42,606 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 [2020-11-29 18:33:42,607 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:42,608 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:42,608 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:42,608 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:42,608 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:42,609 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:42,609 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:42,623 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:42,664 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 [2020-11-29 18:33:42,667 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:42,667 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:42,667 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:42,667 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:42,667 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:42,668 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:42,668 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 [2020-11-29 18:33:42,670 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:42,713 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 [2020-11-29 18:33:42,715 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:42,715 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:42,716 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:42,716 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:42,716 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:42,720 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:42,720 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:42,728 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:33:42,741 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-29 18:33:42,742 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:42,746 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:33:42,746 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:33:42,746 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:33:42,747 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#t~ret3) = 1*rec2_#t~ret3 Supporting invariants [] Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:42,790 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:33:42,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:42,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:42,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-29 18:33:42,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:42,950 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:42,962 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:42,967 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:43,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:43,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-29 18:33:43,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:43,406 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-29 18:33:43,407 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 [2020-11-29 18:33:43,407 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 113 states and 157 transitions. cyclomatic complexity: 51 Second operand 11 states. [2020-11-29 18:33:44,121 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. [2020-11-29 18:33:44,122 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 [2020-11-29 18:33:44,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-29 18:33:44,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 52 transitions. [2020-11-29 18:33:44,124 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 24 letters. [2020-11-29 18:33:44,125 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:44,125 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 49 letters. Loop has 24 letters. [2020-11-29 18:33:44,126 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:44,127 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 48 letters. [2020-11-29 18:33:44,128 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:44,128 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 584 states and 903 transitions. [2020-11-29 18:33:44,144 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-11-29 18:33:44,159 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 584 states to 432 states and 649 transitions. [2020-11-29 18:33:44,160 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 140 [2020-11-29 18:33:44,161 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 141 [2020-11-29 18:33:44,161 INFO L73 IsDeterministic]: Start isDeterministic. Operand 432 states and 649 transitions. [2020-11-29 18:33:44,161 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:44,161 INFO L691 BuchiCegarLoop]: Abstraction has 432 states and 649 transitions. [2020-11-29 18:33:44,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states and 649 transitions. [2020-11-29 18:33:44,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 383. [2020-11-29 18:33:44,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 383 states. [2020-11-29 18:33:44,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 534 transitions. [2020-11-29 18:33:44,206 INFO L714 BuchiCegarLoop]: Abstraction has 383 states and 534 transitions. [2020-11-29 18:33:44,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 18:33:44,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-29 18:33:44,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-11-29 18:33:44,208 INFO L87 Difference]: Start difference. First operand 383 states and 534 transitions. Second operand 11 states. [2020-11-29 18:33:44,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 18:33:44,596 INFO L93 Difference]: Finished difference Result 442 states and 645 transitions. [2020-11-29 18:33:44,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-29 18:33:44,598 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 442 states and 645 transitions. [2020-11-29 18:33:44,609 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-11-29 18:33:44,620 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 442 states to 349 states and 495 transitions. [2020-11-29 18:33:44,620 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 131 [2020-11-29 18:33:44,621 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 135 [2020-11-29 18:33:44,621 INFO L73 IsDeterministic]: Start isDeterministic. Operand 349 states and 495 transitions. [2020-11-29 18:33:44,631 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:44,631 INFO L691 BuchiCegarLoop]: Abstraction has 349 states and 495 transitions. [2020-11-29 18:33:44,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states and 495 transitions. [2020-11-29 18:33:44,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 314. [2020-11-29 18:33:44,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-11-29 18:33:44,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 415 transitions. [2020-11-29 18:33:44,674 INFO L714 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-11-29 18:33:44,674 INFO L594 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-11-29 18:33:44,674 INFO L427 BuchiCegarLoop]: ======== Iteration 6============ [2020-11-29 18:33:44,674 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 314 states and 415 transitions. [2020-11-29 18:33:44,678 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-11-29 18:33:44,678 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:44,678 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:44,681 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:44,681 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-29 18:33:44,682 INFO L794 eck$LassoCheckResult]: Stem: 3449#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 3450#L25 call main_#t~ret6 := rec2(main_~x~0);< 3467#rec2ENTRY ~j := #in~j; 3489#L18 assume !(~j <= 0); 3469#L20 call #t~ret3 := rec1(~j - 1);< 3487#rec1ENTRY ~i := #in~i; 3503#L12 assume !(~i <= 0); 3497#L14 call #t~ret0 := rec1(~i - 2);< 3502#rec1ENTRY ~i := #in~i; 3507#L12 assume ~i <= 0;#res := 0; 3561#rec1FINAL assume true; 3558#rec1EXIT >#27#return; 3553#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 3554#rec1ENTRY ~i := #in~i; 3557#L12 assume ~i <= 0;#res := 0; 3556#rec1FINAL assume true; 3552#rec1EXIT >#29#return; 3547#L14-2 call #t~ret2 := rec1(#t~ret1);< 3550#rec1ENTRY ~i := #in~i; 3555#L12 assume ~i <= 0;#res := 0; 3551#rec1FINAL assume true; 3549#rec1EXIT >#31#return; 3545#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret1;havoc #t~ret2; 3582#rec1FINAL assume true; 3468#rec1EXIT >#33#return; 3388#L20-1 call #t~ret4 := rec2(#t~ret3);< 3387#rec2ENTRY ~j := #in~j; 3389#L18 assume !(~j <= 0); 3534#L20 call #t~ret3 := rec1(~j - 1);< 3474#rec1ENTRY ~i := #in~i; 3580#L12 assume !(~i <= 0); 3418#L14 call #t~ret0 := rec1(~i - 2);< 3452#rec1ENTRY [2020-11-29 18:33:44,682 INFO L796 eck$LassoCheckResult]: Loop: 3452#rec1ENTRY ~i := #in~i; 3566#L12 assume !(~i <= 0); 3417#L14 call #t~ret0 := rec1(~i - 2);< 3452#rec1ENTRY [2020-11-29 18:33:44,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:44,683 INFO L82 PathProgramCache]: Analyzing trace with hash -744961728, now seen corresponding path program 2 times [2020-11-29 18:33:44,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:44,683 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879767861] [2020-11-29 18:33:44,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:44,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:44,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-29 18:33:44,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:44,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-29 18:33:44,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:44,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-29 18:33:44,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:44,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-29 18:33:44,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:44,872 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-11-29 18:33:44,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879767861] [2020-11-29 18:33:44,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327671757] [2020-11-29 18:33:44,873 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:44,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-29 18:33:44,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 18:33:44,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-29 18:33:44,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:44,959 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-11-29 18:33:44,959 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 18:33:44,959 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2020-11-29 18:33:44,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380427742] [2020-11-29 18:33:44,960 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-11-29 18:33:44,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:44,961 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2020-11-29 18:33:44,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:44,962 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105149205] [2020-11-29 18:33:44,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:44,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:44,965 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:44,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:44,968 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:44,969 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:45,025 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:45,025 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:45,026 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:45,026 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:45,026 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:33:45,026 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:45,026 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:45,026 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:45,026 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-11-29 18:33:45,026 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:45,026 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:45,027 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,032 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,039 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,048 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,052 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,055 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,094 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:45,094 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:45,103 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:45,103 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:45,106 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:45,106 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:45,136 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:45,136 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:45,173 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:33:45,173 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:45,271 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:33:45,273 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:45,273 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:45,273 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:45,273 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:45,273 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:33:45,273 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:45,273 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:45,273 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:45,273 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-11-29 18:33:45,274 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:45,274 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:45,274 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,277 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,286 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,289 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,292 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,295 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:45,378 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:45,378 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) [2020-11-29 18:33:45,389 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 [2020-11-29 18:33:45,392 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:45,392 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:45,392 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:45,392 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:45,392 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:45,393 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:45,393 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 [2020-11-29 18:33:45,396 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:45,430 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 [2020-11-29 18:33:45,431 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:45,431 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:45,432 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:45,432 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:45,432 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:45,433 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:45,433 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:45,435 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:33:45,437 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-29 18:33:45,437 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:45,440 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:33:45,440 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:33:45,441 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:33:45,441 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-11-29 18:33:45,476 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:33:45,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:45,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:45,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-29 18:33:45,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:45,704 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:45,712 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:45,718 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:45,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:45,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-29 18:33:45,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:45,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:33:45,761 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 [2020-11-29 18:33:45,761 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-11-29 18:33:45,870 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. [2020-11-29 18:33:45,874 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 [2020-11-29 18:33:45,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-29 18:33:45,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-11-29 18:33:45,876 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-11-29 18:33:45,876 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:45,876 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-29 18:33:45,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:46,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:46,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-29 18:33:46,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:46,035 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:46,039 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:46,046 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:46,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:46,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-29 18:33:46,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:46,101 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:33:46,101 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 [2020-11-29 18:33:46,102 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-11-29 18:33:46,239 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. [2020-11-29 18:33:46,240 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 [2020-11-29 18:33:46,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-29 18:33:46,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-11-29 18:33:46,242 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-11-29 18:33:46,242 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:46,242 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-29 18:33:46,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:46,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:46,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-29 18:33:46,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:46,378 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:46,382 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:46,386 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:46,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:46,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-29 18:33:46,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:46,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:33:46,466 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 [2020-11-29 18:33:46,466 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-11-29 18:33:46,674 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. [2020-11-29 18:33:46,675 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 [2020-11-29 18:33:46,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-29 18:33:46,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-11-29 18:33:46,676 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-11-29 18:33:46,676 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:46,677 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 35 letters. Loop has 3 letters. [2020-11-29 18:33:46,677 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:46,677 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 6 letters. [2020-11-29 18:33:46,678 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:46,678 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 485 states and 616 transitions. [2020-11-29 18:33:46,688 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 26 [2020-11-29 18:33:46,697 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 485 states to 395 states and 526 transitions. [2020-11-29 18:33:46,698 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 129 [2020-11-29 18:33:46,698 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 136 [2020-11-29 18:33:46,699 INFO L73 IsDeterministic]: Start isDeterministic. Operand 395 states and 526 transitions. [2020-11-29 18:33:46,699 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:46,699 INFO L691 BuchiCegarLoop]: Abstraction has 395 states and 526 transitions. [2020-11-29 18:33:46,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states and 526 transitions. [2020-11-29 18:33:46,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 351. [2020-11-29 18:33:46,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-11-29 18:33:46,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 456 transitions. [2020-11-29 18:33:46,722 INFO L714 BuchiCegarLoop]: Abstraction has 351 states and 456 transitions. [2020-11-29 18:33:46,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 18:33:46,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-29 18:33:46,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-11-29 18:33:46,724 INFO L87 Difference]: Start difference. First operand 351 states and 456 transitions. Second operand 10 states. [2020-11-29 18:33:46,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 18:33:46,910 INFO L93 Difference]: Finished difference Result 378 states and 513 transitions. [2020-11-29 18:33:46,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-11-29 18:33:46,911 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 378 states and 513 transitions. [2020-11-29 18:33:46,919 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-11-29 18:33:46,921 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 378 states to 104 states and 142 transitions. [2020-11-29 18:33:46,921 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 98 [2020-11-29 18:33:46,922 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 98 [2020-11-29 18:33:46,922 INFO L73 IsDeterministic]: Start isDeterministic. Operand 104 states and 142 transitions. [2020-11-29 18:33:46,922 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:46,922 INFO L691 BuchiCegarLoop]: Abstraction has 104 states and 142 transitions. [2020-11-29 18:33:46,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states and 142 transitions. [2020-11-29 18:33:46,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 86. [2020-11-29 18:33:46,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-11-29 18:33:46,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 106 transitions. [2020-11-29 18:33:46,929 INFO L714 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-11-29 18:33:46,929 INFO L594 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-11-29 18:33:46,929 INFO L427 BuchiCegarLoop]: ======== Iteration 7============ [2020-11-29 18:33:46,929 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 86 states and 106 transitions. [2020-11-29 18:33:46,930 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-11-29 18:33:46,931 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:46,931 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:46,932 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:46,932 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-29 18:33:46,932 INFO L794 eck$LassoCheckResult]: Stem: 6181#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; 6182#L25 call main_#t~ret6 := rec2(main_~x~0);< 6187#rec2ENTRY ~j := #in~j; 6209#L18 assume !(~j <= 0); 6206#L20 call #t~ret3 := rec1(~j - 1);< 6208#rec1ENTRY ~i := #in~i; 6207#L12 assume !(~i <= 0); 6177#L14 call #t~ret0 := rec1(~i - 2);< 6189#rec1ENTRY ~i := #in~i; 6158#L12 assume !(~i <= 0); 6157#L14 [2020-11-29 18:33:46,932 INFO L796 eck$LassoCheckResult]: Loop: 6157#L14 call #t~ret0 := rec1(~i - 2);< 6156#rec1ENTRY ~i := #in~i; 6158#L12 assume !(~i <= 0); 6157#L14 [2020-11-29 18:33:46,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:46,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1371444593, now seen corresponding path program 3 times [2020-11-29 18:33:46,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:46,933 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756518260] [2020-11-29 18:33:46,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:46,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:46,938 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:46,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:46,941 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:46,943 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:46,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:46,944 INFO L82 PathProgramCache]: Analyzing trace with hash 54781, now seen corresponding path program 4 times [2020-11-29 18:33:46,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:46,945 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497626325] [2020-11-29 18:33:46,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:46,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:46,948 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:46,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:46,950 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:46,951 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:46,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:46,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1318041775, now seen corresponding path program 4 times [2020-11-29 18:33:46,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:46,953 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780597480] [2020-11-29 18:33:46,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:46,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:46,958 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:46,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:46,962 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:46,964 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:47,023 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:47,023 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:47,023 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:47,023 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:47,024 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:33:47,024 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:47,024 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:47,024 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:47,024 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-11-29 18:33:47,024 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:47,024 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:47,025 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:47,049 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:47,052 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:47,057 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:47,061 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:47,131 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:47,131 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:47,134 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:47,134 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:47,174 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:33:47,174 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:52,345 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:33:52,347 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:52,348 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:52,348 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:52,348 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:52,348 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:33:52,348 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:52,348 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:52,348 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:52,348 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-11-29 18:33:52,348 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:52,349 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:52,349 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:52,362 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:52,365 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:52,368 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:52,372 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:52,415 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:52,416 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:52,418 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 [2020-11-29 18:33:52,420 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:52,420 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:52,420 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:52,420 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:52,420 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:52,422 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:52,422 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:52,425 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:33:52,428 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-29 18:33:52,428 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:52,430 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:33:52,431 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:33:52,431 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:33:52,431 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_~i) = 1*rec1_~i Supporting invariants [] [2020-11-29 18:33:52,458 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:33:52,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:52,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-29 18:33:52,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:52,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-29 18:33:52,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:52,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:33:52,576 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 [2020-11-29 18:33:52,576 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 86 states and 106 transitions. cyclomatic complexity: 23 Second operand 4 states. [2020-11-29 18:33:52,633 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. [2020-11-29 18:33:52,634 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 [2020-11-29 18:33:52,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-11-29 18:33:52,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 13 transitions. [2020-11-29 18:33:52,634 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 3 letters. [2020-11-29 18:33:52,635 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:52,636 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 13 letters. Loop has 3 letters. [2020-11-29 18:33:52,636 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:52,636 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 6 letters. [2020-11-29 18:33:52,637 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:52,637 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 100 states and 124 transitions. [2020-11-29 18:33:52,640 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-11-29 18:33:52,642 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 100 states to 94 states and 117 transitions. [2020-11-29 18:33:52,642 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 83 [2020-11-29 18:33:52,643 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 84 [2020-11-29 18:33:52,643 INFO L73 IsDeterministic]: Start isDeterministic. Operand 94 states and 117 transitions. [2020-11-29 18:33:52,643 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:52,644 INFO L691 BuchiCegarLoop]: Abstraction has 94 states and 117 transitions. [2020-11-29 18:33:52,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states and 117 transitions. [2020-11-29 18:33:52,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2020-11-29 18:33:52,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-11-29 18:33:52,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 114 transitions. [2020-11-29 18:33:52,652 INFO L714 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-11-29 18:33:52,652 INFO L594 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-11-29 18:33:52,652 INFO L427 BuchiCegarLoop]: ======== Iteration 8============ [2020-11-29 18:33:52,652 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 114 transitions. [2020-11-29 18:33:52,653 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-11-29 18:33:52,654 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:33:52,654 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:33:52,656 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 18:33:52,656 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2020-11-29 18:33:52,657 INFO L794 eck$LassoCheckResult]: Stem: 6438#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; 6407#L25 call main_#t~ret6 := rec2(main_~x~0);< 6406#rec2ENTRY ~j := #in~j; 6408#L18 assume !(~j <= 0); 6441#L20 call #t~ret3 := rec1(~j - 1);< 6442#rec1ENTRY ~i := #in~i; 6463#L12 assume !(~i <= 0); 6426#L14 call #t~ret0 := rec1(~i - 2);< 6460#rec1ENTRY ~i := #in~i; 6477#L12 assume !(~i <= 0); 6410#L14 call #t~ret0 := rec1(~i - 2);< 6409#rec1ENTRY ~i := #in~i; 6411#L12 assume ~i <= 0;#res := 0; 6497#rec1FINAL assume true; 6495#rec1EXIT >#27#return; 6419#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6425#rec1ENTRY ~i := #in~i; 6491#L12 assume ~i <= 0;#res := 0; 6490#rec1FINAL assume true; 6468#rec1EXIT >#29#return; 6469#L14-2 call #t~ret2 := rec1(#t~ret1);< 6481#rec1ENTRY ~i := #in~i; 6487#L12 assume ~i <= 0;#res := 0; 6486#rec1FINAL assume true; 6479#rec1EXIT >#31#return; 6478#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret1;havoc #t~ret2; 6466#rec1FINAL assume true; 6467#rec1EXIT >#27#return; 6422#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6456#rec1ENTRY [2020-11-29 18:33:52,657 INFO L796 eck$LassoCheckResult]: Loop: 6456#rec1ENTRY ~i := #in~i; 6484#L12 assume !(~i <= 0); 6421#L14 call #t~ret0 := rec1(~i - 2);< 6439#rec1ENTRY ~i := #in~i; 6483#L12 assume !(~i <= 0); 6417#L14 call #t~ret0 := rec1(~i - 2);< 6440#rec1ENTRY ~i := #in~i; 6437#L12 assume ~i <= 0;#res := 0; 6416#rec1FINAL assume true; 6418#rec1EXIT >#27#return; 6419#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6425#rec1ENTRY ~i := #in~i; 6491#L12 assume ~i <= 0;#res := 0; 6490#rec1FINAL assume true; 6468#rec1EXIT >#29#return; 6469#L14-2 call #t~ret2 := rec1(#t~ret1);< 6481#rec1ENTRY ~i := #in~i; 6487#L12 assume ~i <= 0;#res := 0; 6486#rec1FINAL assume true; 6479#rec1EXIT >#31#return; 6478#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret1;havoc #t~ret2; 6466#rec1FINAL assume true; 6467#rec1EXIT >#27#return; 6423#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6456#rec1ENTRY [2020-11-29 18:33:52,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:52,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2020-11-29 18:33:52,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:52,658 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190448519] [2020-11-29 18:33:52,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:52,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:52,672 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:52,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:52,684 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:52,694 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:52,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:52,695 INFO L82 PathProgramCache]: Analyzing trace with hash -165506564, now seen corresponding path program 1 times [2020-11-29 18:33:52,695 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:52,696 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095059330] [2020-11-29 18:33:52,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:52,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:52,729 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:52,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:33:52,734 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:33:52,737 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:33:52,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:52,748 INFO L82 PathProgramCache]: Analyzing trace with hash 2126813793, now seen corresponding path program 2 times [2020-11-29 18:33:52,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:33:52,748 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264814819] [2020-11-29 18:33:52,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:33:52,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-29 18:33:52,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-29 18:33:52,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-29 18:33:52,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-29 18:33:52,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-11-29 18:33:52,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-29 18:33:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-29 18:33:52,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-29 18:33:52,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:52,973 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 24 proven. 29 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2020-11-29 18:33:52,973 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264814819] [2020-11-29 18:33:52,973 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015820969] [2020-11-29 18:33:52,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-29 18:33:53,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 18:33:53,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-29 18:33:53,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:53,073 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 109 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-11-29 18:33:53,073 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 18:33:53,073 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-11-29 18:33:53,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775580272] [2020-11-29 18:33:53,368 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2020-11-29 18:33:53,501 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:53,501 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:53,501 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:53,501 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:53,501 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:33:53,501 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:53,501 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:53,502 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:53,502 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-11-29 18:33:53,502 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:53,502 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:53,503 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,514 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,528 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,531 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,542 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,545 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,613 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:53,613 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:53,616 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:53,617 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:53,620 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:53,620 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,649 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:53,649 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:53,652 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:53,653 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,681 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:53,681 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:53,684 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:33:53,684 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,714 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:33:53,714 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,747 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:33:53,747 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:33:53,752 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:33:53,777 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:33:53,777 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:33:53,777 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:33:53,777 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:33:53,778 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:33:53,778 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:33:53,778 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:33:53,778 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:33:53,778 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-11-29 18:33:53,778 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:33:53,778 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:33:53,779 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,797 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,800 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,812 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,815 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,818 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:33:53,877 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:33:53,877 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,881 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 [2020-11-29 18:33:53,882 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:53,882 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:53,883 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:53,883 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:53,883 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:53,887 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:53,888 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:53,890 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,920 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 [2020-11-29 18:33:53,921 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:53,921 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:53,921 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:53,922 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:53,922 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:53,922 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:53,923 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:53,925 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,952 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 [2020-11-29 18:33:53,954 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:33:53,954 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:33:53,954 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:33:53,954 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:33:53,954 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:33:53,955 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:33:53,955 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:33:53,957 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:33:53,961 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-29 18:33:53,961 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_545e40e0-f71f-41c0-adbc-7f0ca9ef5cc2/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 [2020-11-29 18:33:53,964 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:33:53,964 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:33:53,964 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:33:53,964 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-11-29 18:33:53,990 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:33:54,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:54,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:54,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-29 18:33:54,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:54,117 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:54,135 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:54,139 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:54,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:54,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-29 18:33:54,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:54,429 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-29 18:33:54,430 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 [2020-11-29 18:33:54,430 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-11-29 18:33:54,544 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. [2020-11-29 18:33:54,545 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 [2020-11-29 18:33:54,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-29 18:33:54,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-11-29 18:33:54,545 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-11-29 18:33:54,545 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:54,545 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-29 18:33:54,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:54,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:54,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-29 18:33:54,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:54,672 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:54,675 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:54,678 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:54,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:54,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-29 18:33:54,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:54,975 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-29 18:33:54,976 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 [2020-11-29 18:33:54,976 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-11-29 18:33:55,084 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. [2020-11-29 18:33:55,091 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 [2020-11-29 18:33:55,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-29 18:33:55,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-11-29 18:33:55,092 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-11-29 18:33:55,092 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:55,092 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-29 18:33:55,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:55,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:55,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-29 18:33:55,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:55,239 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:55,242 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:55,245 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:55,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:55,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-29 18:33:55,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-29 18:33:55,567 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 [2020-11-29 18:33:55,567 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-11-29 18:33:56,038 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. [2020-11-29 18:33:56,039 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 [2020-11-29 18:33:56,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-29 18:33:56,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 38 transitions. [2020-11-29 18:33:56,040 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 38 transitions. Stem has 29 letters. Loop has 24 letters. [2020-11-29 18:33:56,041 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:56,041 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-29 18:33:56,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:33:56,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:56,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-29 18:33:56,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:56,171 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:56,174 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:56,178 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 18:33:56,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:33:56,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-29 18:33:56,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:33:56,483 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-29 18:33:56,484 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 [2020-11-29 18:33:56,484 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-11-29 18:33:57,158 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 12 [2020-11-29 18:33:57,395 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. [2020-11-29 18:33:57,396 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 [2020-11-29 18:33:57,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-29 18:33:57,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 49 transitions. [2020-11-29 18:33:57,397 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 24 letters. [2020-11-29 18:33:57,398 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:57,398 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 53 letters. Loop has 24 letters. [2020-11-29 18:33:57,399 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:57,399 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 48 letters. [2020-11-29 18:33:57,401 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:33:57,401 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 409 states and 515 transitions. [2020-11-29 18:33:57,414 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 62 [2020-11-29 18:33:57,420 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 409 states to 253 states and 345 transitions. [2020-11-29 18:33:57,420 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 154 [2020-11-29 18:33:57,421 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 164 [2020-11-29 18:33:57,421 INFO L73 IsDeterministic]: Start isDeterministic. Operand 253 states and 345 transitions. [2020-11-29 18:33:57,421 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:33:57,421 INFO L691 BuchiCegarLoop]: Abstraction has 253 states and 345 transitions. [2020-11-29 18:33:57,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states and 345 transitions. [2020-11-29 18:33:57,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 216. [2020-11-29 18:33:57,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-11-29 18:33:57,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 270 transitions. [2020-11-29 18:33:57,441 INFO L714 BuchiCegarLoop]: Abstraction has 216 states and 270 transitions. [2020-11-29 18:33:57,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 18:33:57,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-29 18:33:57,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-11-29 18:33:57,443 INFO L87 Difference]: Start difference. First operand 216 states and 270 transitions. Second operand 8 states. [2020-11-29 18:33:57,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 18:33:57,564 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-11-29 18:33:57,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-29 18:33:57,565 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 35 states and 37 transitions. [2020-11-29 18:33:57,566 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-29 18:33:57,566 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 35 states to 0 states and 0 transitions. [2020-11-29 18:33:57,567 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-11-29 18:33:57,567 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-11-29 18:33:57,567 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-11-29 18:33:57,567 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-11-29 18:33:57,567 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 18:33:57,567 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 18:33:57,567 INFO L594 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 18:33:57,567 INFO L427 BuchiCegarLoop]: ======== Iteration 9============ [2020-11-29 18:33:57,567 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2020-11-29 18:33:57,567 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-29 18:33:57,568 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2020-11-29 18:33:57,574 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 29.11 06:33:57 BoogieIcfgContainer [2020-11-29 18:33:57,574 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-11-29 18:33:57,576 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-29 18:33:57,576 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-29 18:33:57,576 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-29 18:33:57,579 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 06:33:32" (3/4) ... [2020-11-29 18:33:57,584 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-11-29 18:33:57,584 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-29 18:33:57,585 INFO L168 Benchmark]: Toolchain (without parser) took 25708.47 ms. Allocated memory was 102.8 MB in the beginning and 205.5 MB in the end (delta: 102.8 MB). Free memory was 68.3 MB in the beginning and 174.9 MB in the end (delta: -106.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:33:57,586 INFO L168 Benchmark]: CDTParser took 0.39 ms. Allocated memory is still 102.8 MB. Free memory was 74.4 MB in the beginning and 74.4 MB in the end (delta: 26.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:33:57,586 INFO L168 Benchmark]: CACSL2BoogieTranslator took 397.52 ms. Allocated memory is still 102.8 MB. Free memory was 68.2 MB in the beginning and 81.1 MB in the end (delta: -12.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-29 18:33:57,587 INFO L168 Benchmark]: Boogie Procedure Inliner took 47.19 ms. Allocated memory is still 102.8 MB. Free memory was 81.1 MB in the beginning and 79.5 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:33:57,587 INFO L168 Benchmark]: Boogie Preprocessor took 28.49 ms. Allocated memory is still 102.8 MB. Free memory was 79.5 MB in the beginning and 78.8 MB in the end (delta: 765.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:33:57,588 INFO L168 Benchmark]: RCFGBuilder took 391.61 ms. Allocated memory is still 102.8 MB. Free memory was 78.8 MB in the beginning and 69.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-29 18:33:57,588 INFO L168 Benchmark]: BuchiAutomizer took 24822.73 ms. Allocated memory was 102.8 MB in the beginning and 205.5 MB in the end (delta: 102.8 MB). Free memory was 69.5 MB in the beginning and 174.9 MB in the end (delta: -105.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:33:57,589 INFO L168 Benchmark]: Witness Printer took 8.53 ms. Allocated memory is still 205.5 MB. Free memory is still 174.9 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:33:57,598 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.39 ms. Allocated memory is still 102.8 MB. Free memory was 74.4 MB in the beginning and 74.4 MB in the end (delta: 26.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 397.52 ms. Allocated memory is still 102.8 MB. Free memory was 68.2 MB in the beginning and 81.1 MB in the end (delta: -12.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 47.19 ms. Allocated memory is still 102.8 MB. Free memory was 81.1 MB in the beginning and 79.5 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.49 ms. Allocated memory is still 102.8 MB. Free memory was 79.5 MB in the beginning and 78.8 MB in the end (delta: 765.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 391.61 ms. Allocated memory is still 102.8 MB. Free memory was 78.8 MB in the beginning and 69.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * BuchiAutomizer took 24822.73 ms. Allocated memory was 102.8 MB in the beginning and 205.5 MB in the end (delta: 102.8 MB). Free memory was 69.5 MB in the beginning and 174.9 MB in the end (delta: -105.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 8.53 ms. Allocated memory is still 205.5 MB. Free memory is still 174.9 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@2c22cdcb 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 11 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 24.7s and 9 iterations. TraceHistogramMax:5. Analysis of lassos took 15.1s. Construction of modules took 1.7s. Büchi inclusion checks took 7.0s. 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, 338 SDslu, 505 SDs, 0 SdLazy, 952 SolverSat, 325 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.7s Time LassoAnalysisResults: nont0 unkn0 SFLI1 SFLT3 conc0 concLT3 SILN0 SILU0 SILI0 SILT1 lasso0 LassoPreprocessingBenchmarks: Lassos: inital13 mio100 ax100 hnf92 lsp100 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq155 hnf92 smp100 dnf100 smp100 tf112 neg100 sie110 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 23ms VariablesStem: 0 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 0 MotzkinApplications: 2 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 14 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 7 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 8.3s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...