./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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/config/AutomizerTermination.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c -s /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:39,730 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 03:20:39,751 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 03:20:39,811 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 03:20:39,812 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 03:20:39,818 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 03:20:39,822 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 03:20:39,826 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 03:20:39,829 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 03:20:39,836 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 03:20:39,837 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 03:20:39,839 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 03:20:39,839 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 03:20:39,840 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 03:20:39,842 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 03:20:39,843 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 03:20:39,844 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 03:20:39,848 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 03:20:39,854 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 03:20:39,864 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 03:20:39,867 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 03:20:39,868 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 03:20:39,871 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 03:20:39,872 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 03:20:39,876 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 03:20:39,876 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 03:20:39,877 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 03:20:39,879 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 03:20:39,880 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 03:20:39,881 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 03:20:39,881 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 03:20:39,882 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 03:20:39,884 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 03:20:39,885 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 03:20:39,887 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 03:20:39,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 03:20:39,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 03:20:39,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 03:20:39,888 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 03:20:39,889 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 03:20:39,890 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 03:20:39,893 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-11-28 03:20:39,931 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 03:20:39,931 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 03:20:39,933 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 03:20:39,933 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 03:20:39,933 INFO L138 SettingsManager]: * Use SBE=true [2020-11-28 03:20:39,933 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-11-28 03:20:39,934 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-11-28 03:20:39,934 INFO L138 SettingsManager]: * Use old map elimination=false [2020-11-28 03:20:39,934 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-11-28 03:20:39,934 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-11-28 03:20:39,934 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-11-28 03:20:39,935 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 03:20:39,935 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-28 03:20:39,935 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 03:20:39,935 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 03:20:39,935 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-11-28 03:20:39,936 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-11-28 03:20:39,936 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-11-28 03:20:39,936 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 03:20:39,936 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-11-28 03:20:39,936 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 03:20:39,937 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-11-28 03:20:39,937 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 03:20:39,937 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-28 03:20:39,937 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-11-28 03:20:39,938 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 03:20:39,938 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-28 03:20:39,938 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 03:20:39,938 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-11-28 03:20:39,939 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-11-28 03:20:39,939 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cb528549fa76ae8087cf7043645dfa20323a0116 [2020-11-28 03:20:40,174 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 03:20:40,198 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 03:20:40,200 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 03:20:40,202 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 03:20:40,202 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 03:20:40,203 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/../../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-11-28 03:20:40,284 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/data/d27a47051/c4a3c35c9f324e4bae1168ae5f126c65/FLAGcd3b567de [2020-11-28 03:20:40,800 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 03:20:40,800 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-11-28 03:20:40,811 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/data/d27a47051/c4a3c35c9f324e4bae1168ae5f126c65/FLAGcd3b567de [2020-11-28 03:20:41,183 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/data/d27a47051/c4a3c35c9f324e4bae1168ae5f126c65 [2020-11-28 03:20:41,188 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 03:20:41,190 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 03:20:41,192 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 03:20:41,192 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 03:20:41,196 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 03:20:41,197 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,204 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27c3f9ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41, skipping insertion in model container [2020-11-28 03:20:41,204 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,213 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 03:20:41,226 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 03:20:41,353 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:20:41,367 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 03:20:41,416 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:20:41,430 INFO L208 MainTranslator]: Completed translation [2020-11-28 03:20:41,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41 WrapperNode [2020-11-28 03:20:41,431 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 03:20:41,433 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 03:20:41,434 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 03:20:41,435 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 03:20:41,444 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,448 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,464 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 03:20:41,464 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 03:20:41,465 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 03:20:41,465 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 03:20:41,473 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,473 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,474 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,474 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,476 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,478 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,479 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... [2020-11-28 03:20:41,480 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 03:20:41,481 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 03:20:41,481 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 03:20:41,481 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 03:20:41,485 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:41,557 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-11-28 03:20:41,557 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-11-28 03:20:41,558 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-11-28 03:20:41,558 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-11-28 03:20:41,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 03:20:41,559 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 03:20:41,827 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 03:20:41,828 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-11-28 03:20:41,829 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:20:41 BoogieIcfgContainer [2020-11-28 03:20:41,829 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 03:20:41,830 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-11-28 03:20:41,830 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-11-28 03:20:41,842 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-11-28 03:20:41,843 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-28 03:20:41,843 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 28.11 03:20:41" (1/3) ... [2020-11-28 03:20:41,844 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@683da79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 28.11 03:20:41, skipping insertion in model container [2020-11-28 03:20:41,845 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-28 03:20:41,845 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:41" (2/3) ... [2020-11-28 03:20:41,845 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@683da79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 28.11 03:20:41, skipping insertion in model container [2020-11-28 03:20:41,845 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-28 03:20:41,845 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:20:41" (3/3) ... [2020-11-28 03:20:41,847 INFO L373 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1b.c [2020-11-28 03:20:41,922 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-11-28 03:20:41,922 INFO L360 BuchiCegarLoop]: Hoare is false [2020-11-28 03:20:41,922 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-11-28 03:20:41,922 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 03:20:41,922 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 03:20:41,922 INFO L364 BuchiCegarLoop]: Difference is false [2020-11-28 03:20:41,923 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 03:20:41,923 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-11-28 03:20:41,934 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-11-28 03:20:41,953 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:41,954 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:41,954 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:41,961 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-28 03:20:41,961 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:41,961 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-11-28 03:20:41,961 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-11-28 03:20:41,964 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:41,964 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:41,964 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:41,965 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-28 03:20:41,965 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:41,972 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 [2020-11-28 03:20:41,972 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 [2020-11-28 03:20:41,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:41,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2020-11-28 03:20:41,987 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:41,988 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143680381] [2020-11-28 03:20:41,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:42,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:42,054 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:42,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:42,058 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:42,074 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:42,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:42,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2020-11-28 03:20:42,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:42,076 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769802594] [2020-11-28 03:20:42,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:42,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:42,094 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:42,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:42,103 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:42,110 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:42,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:42,118 INFO L82 PathProgramCache]: Analyzing trace with hash -1371489668, now seen corresponding path program 1 times [2020-11-28 03:20:42,123 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:42,124 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099960135] [2020-11-28 03:20:42,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:42,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:42,136 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:42,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:42,150 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:42,152 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:42,412 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:42,413 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:42,413 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:42,413 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:42,413 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:20:42,414 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:42,414 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:42,414 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:42,414 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-11-28 03:20:42,414 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:42,415 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:42,431 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:42,443 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:42,447 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:42,451 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:42,456 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:42,733 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:42,734 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:42,744 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:42,744 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 [2020-11-28 03:20:42,755 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:42,756 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:42,796 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:42,797 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:42,800 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:42,801 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:42,836 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:42,836 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 [2020-11-28 03:20:42,843 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:42,843 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:42,880 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:42,880 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:42,890 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:42,890 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:42,932 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:42,932 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:42,978 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:20:42,978 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:42,987 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:20:43,020 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:43,020 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:43,020 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:43,020 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:43,020 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:20:43,020 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:43,020 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:43,021 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:43,021 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-11-28 03:20:43,021 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:43,021 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:43,022 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:43,029 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:43,032 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:43,037 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:43,047 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:43,108 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:43,112 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:43,121 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 [2020-11-28 03:20:43,123 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:43,123 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:43,124 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:43,124 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:43,124 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:43,127 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:43,127 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 [2020-11-28 03:20:43,130 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:43,174 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 [2020-11-28 03:20:43,176 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:43,176 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:43,176 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:43,176 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:43,177 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:43,195 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:43,196 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:20:43,200 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:43,246 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 [2020-11-28 03:20:43,249 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:43,249 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:43,249 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:43,249 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:43,250 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:43,250 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:43,251 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:43,253 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:43,292 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 [2020-11-28 03:20:43,294 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:43,295 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:43,295 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:43,295 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:43,295 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:43,297 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:43,297 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:20:43,301 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:20:43,307 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-28 03:20:43,307 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:43,313 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:20:43,314 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:20:43,314 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:20:43,314 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#in~j) = 1*rec2_#in~j Supporting invariants [] [2020-11-28 03:20:43,348 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:20:43,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:43,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:43,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 03:20:43,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:43,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:43,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-28 03:20:43,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:43,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:43,645 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 [2020-11-28 03:20:43,647 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 21 states. Second operand 7 states. [2020-11-28 03:20:44,271 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. [2020-11-28 03:20:44,273 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 [2020-11-28 03:20:44,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-11-28 03:20:44,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 57 transitions. [2020-11-28 03:20:44,279 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 8 letters. [2020-11-28 03:20:44,281 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:44,282 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 10 letters. Loop has 8 letters. [2020-11-28 03:20:44,283 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:44,283 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 16 letters. [2020-11-28 03:20:44,283 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:44,284 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 194 states and 279 transitions. [2020-11-28 03:20:44,316 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:44,328 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 194 states to 82 states and 120 transitions. [2020-11-28 03:20:44,329 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 35 [2020-11-28 03:20:44,330 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 38 [2020-11-28 03:20:44,332 INFO L73 IsDeterministic]: Start isDeterministic. Operand 82 states and 120 transitions. [2020-11-28 03:20:44,333 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:44,333 INFO L691 BuchiCegarLoop]: Abstraction has 82 states and 120 transitions. [2020-11-28 03:20:44,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states and 120 transitions. [2020-11-28 03:20:44,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-11-28 03:20:44,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-11-28 03:20:44,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 83 transitions. [2020-11-28 03:20:44,371 INFO L714 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-11-28 03:20:44,372 INFO L594 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-11-28 03:20:44,372 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-11-28 03:20:44,372 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 55 states and 83 transitions. [2020-11-28 03:20:44,373 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:44,373 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:44,373 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:44,374 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:44,374 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-28 03:20:44,374 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 [2020-11-28 03:20:44,375 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 [2020-11-28 03:20:44,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:44,375 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2020-11-28 03:20:44,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:44,376 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096969191] [2020-11-28 03:20:44,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:44,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:44,385 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:44,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:44,390 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:44,392 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:44,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:44,393 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2020-11-28 03:20:44,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:44,393 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976328484] [2020-11-28 03:20:44,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:44,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:44,397 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:44,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:44,400 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:44,401 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:44,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:44,402 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2020-11-28 03:20:44,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:44,402 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484688871] [2020-11-28 03:20:44,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:44,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:44,420 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:44,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:44,427 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:44,429 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:44,477 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:44,477 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:44,477 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:44,478 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:44,478 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:20:44,478 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:44,478 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:44,478 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:44,478 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-11-28 03:20:44,478 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:44,478 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:44,480 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,486 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,490 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,493 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,498 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,504 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,551 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:44,551 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:44,558 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:44,558 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:44,566 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:44,566 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:44,601 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:44,601 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:44,606 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:44,606 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:44,629 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:44,629 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:44,632 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:44,632 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:44,678 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:44,678 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 [2020-11-28 03:20:44,681 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:44,681 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:44,726 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:44,726 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:44,733 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:44,734 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:44,772 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:44,772 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:44,820 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:20:44,820 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:44,861 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:20:44,863 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:44,864 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:44,864 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:44,864 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:44,864 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:20:44,864 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:44,864 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:44,864 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:44,864 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-11-28 03:20:44,864 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:44,864 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:44,866 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,869 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,872 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,876 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,879 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,887 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:44,936 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:44,936 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:44,945 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 [2020-11-28 03:20:44,947 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:44,947 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:44,947 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:44,947 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:44,947 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:44,948 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:44,948 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:20:44,953 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:44,997 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 [2020-11-28 03:20:44,999 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:44,999 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:44,999 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:44,999 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:44,999 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:45,000 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:45,000 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:45,006 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,044 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 [2020-11-28 03:20:45,045 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:45,045 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:45,045 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:45,046 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:45,046 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:45,047 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:45,047 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:45,053 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,091 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 Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:45,092 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:45,092 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:45,092 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:45,093 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:45,093 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:45,093 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:45,093 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:20:45,097 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:45,128 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 [2020-11-28 03:20:45,130 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:45,130 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:45,130 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:45,130 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:45,130 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:45,131 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:45,132 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:20:45,134 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:20:45,137 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:20:45,137 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,140 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:20:45,140 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:20:45,140 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:20:45,140 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 [2020-11-28 03:20:45,174 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:20:45,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:45,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:45,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-28 03:20:45,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:45,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:45,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:20:45,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:45,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:45,331 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 [2020-11-28 03:20:45,331 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 55 states and 83 transitions. cyclomatic complexity: 32 Second operand 4 states. [2020-11-28 03:20:45,438 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. [2020-11-28 03:20:45,439 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 [2020-11-28 03:20:45,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-11-28 03:20:45,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 17 transitions. [2020-11-28 03:20:45,440 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 3 letters. [2020-11-28 03:20:45,440 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:45,440 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 11 letters. Loop has 3 letters. [2020-11-28 03:20:45,440 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:45,440 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 6 letters. [2020-11-28 03:20:45,440 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:45,440 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 105 states and 149 transitions. [2020-11-28 03:20:45,443 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:45,447 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 105 states to 93 states and 137 transitions. [2020-11-28 03:20:45,447 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 37 [2020-11-28 03:20:45,448 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 39 [2020-11-28 03:20:45,448 INFO L73 IsDeterministic]: Start isDeterministic. Operand 93 states and 137 transitions. [2020-11-28 03:20:45,449 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:45,449 INFO L691 BuchiCegarLoop]: Abstraction has 93 states and 137 transitions. [2020-11-28 03:20:45,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states and 137 transitions. [2020-11-28 03:20:45,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2020-11-28 03:20:45,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-11-28 03:20:45,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 129 transitions. [2020-11-28 03:20:45,461 INFO L714 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-11-28 03:20:45,462 INFO L594 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-11-28 03:20:45,462 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-11-28 03:20:45,462 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 89 states and 129 transitions. [2020-11-28 03:20:45,463 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:45,463 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:45,463 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:45,464 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:45,464 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-28 03:20:45,465 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 [2020-11-28 03:20:45,465 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 [2020-11-28 03:20:45,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:45,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2020-11-28 03:20:45,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:45,466 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931778334] [2020-11-28 03:20:45,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:45,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:45,473 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:45,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:45,488 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:45,490 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:45,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:45,491 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2020-11-28 03:20:45,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:45,491 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712952628] [2020-11-28 03:20:45,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:45,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:45,494 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:45,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:45,497 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:45,498 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:45,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:45,498 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2020-11-28 03:20:45,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:45,499 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517868539] [2020-11-28 03:20:45,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:45,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:45,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:20:45,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:45,620 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 03:20:45,620 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517868539] [2020-11-28 03:20:45,621 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:45,621 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-28 03:20:45,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433896287] [2020-11-28 03:20:45,661 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:45,661 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:45,661 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:45,661 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:45,661 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:20:45,661 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:45,661 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:45,661 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:45,662 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-11-28 03:20:45,662 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:45,662 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:45,663 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,667 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,675 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,678 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,681 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,684 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,736 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:45,737 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,740 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:45,741 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 [2020-11-28 03:20:45,744 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:45,744 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,783 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:45,783 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,822 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:20:45,822 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 [2020-11-28 03:20:45,864 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:20:45,866 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:45,866 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:45,866 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:45,866 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:45,866 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:20:45,867 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:45,867 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:45,867 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:45,867 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-11-28 03:20:45,867 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:45,867 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:45,868 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,878 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,884 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,887 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,890 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,892 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:45,935 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:45,935 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,940 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 [2020-11-28 03:20:45,943 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:45,943 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:45,943 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:45,943 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:45,943 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:45,944 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:45,944 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 [2020-11-28 03:20:45,948 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,984 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 [2020-11-28 03:20:45,986 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:45,986 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:45,986 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:45,986 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:45,986 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:45,988 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:45,988 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:45,990 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:20:45,993 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:20:45,993 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:45,996 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:20:45,996 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:20:45,996 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:20:45,996 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 [2020-11-28 03:20:46,029 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:20:46,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:46,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-28 03:20:46,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:46,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:20:46,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:46,194 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:46,195 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 [2020-11-28 03:20:46,195 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 89 states and 129 transitions. cyclomatic complexity: 47 Second operand 5 states. [2020-11-28 03:20:46,317 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. [2020-11-28 03:20:46,318 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 [2020-11-28 03:20:46,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:20:46,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 19 transitions. [2020-11-28 03:20:46,319 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 3 letters. [2020-11-28 03:20:46,319 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:46,319 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 16 letters. Loop has 3 letters. [2020-11-28 03:20:46,319 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:46,319 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 6 letters. [2020-11-28 03:20:46,320 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:46,320 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 134 states and 193 transitions. [2020-11-28 03:20:46,323 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:46,327 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 134 states to 122 states and 181 transitions. [2020-11-28 03:20:46,327 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 48 [2020-11-28 03:20:46,328 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2020-11-28 03:20:46,328 INFO L73 IsDeterministic]: Start isDeterministic. Operand 122 states and 181 transitions. [2020-11-28 03:20:46,328 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:46,328 INFO L691 BuchiCegarLoop]: Abstraction has 122 states and 181 transitions. [2020-11-28 03:20:46,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states and 181 transitions. [2020-11-28 03:20:46,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 113. [2020-11-28 03:20:46,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-11-28 03:20:46,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 165 transitions. [2020-11-28 03:20:46,350 INFO L714 BuchiCegarLoop]: Abstraction has 113 states and 165 transitions. [2020-11-28 03:20:46,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:46,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 03:20:46,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:20:46,354 INFO L87 Difference]: Start difference. First operand 113 states and 165 transitions. Second operand 6 states. [2020-11-28 03:20:46,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:46,430 INFO L93 Difference]: Finished difference Result 123 states and 175 transitions. [2020-11-28 03:20:46,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 03:20:46,432 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 123 states and 175 transitions. [2020-11-28 03:20:46,435 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2020-11-28 03:20:46,440 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 123 states to 121 states and 173 transitions. [2020-11-28 03:20:46,442 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 55 [2020-11-28 03:20:46,443 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 55 [2020-11-28 03:20:46,444 INFO L73 IsDeterministic]: Start isDeterministic. Operand 121 states and 173 transitions. [2020-11-28 03:20:46,444 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:46,444 INFO L691 BuchiCegarLoop]: Abstraction has 121 states and 173 transitions. [2020-11-28 03:20:46,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states and 173 transitions. [2020-11-28 03:20:46,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 101. [2020-11-28 03:20:46,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-11-28 03:20:46,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 143 transitions. [2020-11-28 03:20:46,458 INFO L714 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-11-28 03:20:46,458 INFO L594 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-11-28 03:20:46,458 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-11-28 03:20:46,458 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 101 states and 143 transitions. [2020-11-28 03:20:46,461 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2020-11-28 03:20:46,461 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:46,462 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:46,463 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:46,464 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:46,464 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 [2020-11-28 03:20:46,464 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 [2020-11-28 03:20:46,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:46,465 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2020-11-28 03:20:46,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:46,466 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919084387] [2020-11-28 03:20:46,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:46,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:46,478 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:46,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:46,500 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:46,503 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:46,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:46,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2020-11-28 03:20:46,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:46,506 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852131795] [2020-11-28 03:20:46,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:46,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:46,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-11-28 03:20:46,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,559 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 03:20:46,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852131795] [2020-11-28 03:20:46,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464895336] [2020-11-28 03:20:46,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2020-11-28 03:20:46,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-28 03:20:46,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:20:46,605 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:46,610 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-11-28 03:20:46,610 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2020-11-28 03:20:46,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780774686] [2020-11-28 03:20:46,611 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-11-28 03:20:46,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:46,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 03:20:46,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:20:46,612 INFO L87 Difference]: Start difference. First operand 101 states and 143 transitions. cyclomatic complexity: 49 Second operand 6 states. [2020-11-28 03:20:46,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:46,669 INFO L93 Difference]: Finished difference Result 117 states and 161 transitions. [2020-11-28 03:20:46,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 03:20:46,669 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 117 states and 161 transitions. [2020-11-28 03:20:46,686 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:46,689 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 117 states to 117 states and 161 transitions. [2020-11-28 03:20:46,689 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 53 [2020-11-28 03:20:46,690 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 53 [2020-11-28 03:20:46,690 INFO L73 IsDeterministic]: Start isDeterministic. Operand 117 states and 161 transitions. [2020-11-28 03:20:46,690 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:46,690 INFO L691 BuchiCegarLoop]: Abstraction has 117 states and 161 transitions. [2020-11-28 03:20:46,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states and 161 transitions. [2020-11-28 03:20:46,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2020-11-28 03:20:46,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-11-28 03:20:46,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 157 transitions. [2020-11-28 03:20:46,713 INFO L714 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-11-28 03:20:46,713 INFO L594 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-11-28 03:20:46,713 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-11-28 03:20:46,713 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 113 states and 157 transitions. [2020-11-28 03:20:46,715 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:20:46,715 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:46,715 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:46,716 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:46,717 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:46,717 INFO L794 eck$LassoCheckResult]: Stem: 1445#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1446#L25 call main_#t~ret6 := rec2(main_~x~0);< 1458#rec2ENTRY ~j := #in~j; 1471#L18 assume !(~j <= 0); 1422#L20 call #t~ret3 := rec1(~j - 1);< 1470#rec1ENTRY ~i := #in~i; 1469#L12 assume !(~i <= 0); 1418#L14 call #t~ret0 := rec1(~i - 2);< 1467#rec1ENTRY ~i := #in~i; 1440#L12 assume ~i <= 0;#res := 0; 1417#rec1FINAL assume true; 1419#rec1EXIT >#27#return; 1410#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1441#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1434#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret0;havoc #t~ret1; 1435#rec1FINAL assume true; 1464#rec1EXIT >#33#return; 1404#L20-1 [2020-11-28 03:20:46,717 INFO L796 eck$LassoCheckResult]: Loop: 1404#L20-1 call #t~ret4 := rec2(#t~ret3);< 1403#rec2ENTRY ~j := #in~j; 1405#L18 assume !(~j <= 0); 1452#L20 call #t~ret3 := rec1(~j - 1);< 1454#rec1ENTRY ~i := #in~i; 1512#L12 assume !(~i <= 0); 1447#L14 call #t~ret0 := rec1(~i - 2);< 1454#rec1ENTRY ~i := #in~i; 1512#L12 assume ~i <= 0;#res := 0; 1511#rec1FINAL assume true; 1507#rec1EXIT >#27#return; 1411#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1506#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1463#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret0;havoc #t~ret1; 1475#rec1FINAL assume true; 1461#rec1EXIT >#33#return; 1404#L20-1 [2020-11-28 03:20:46,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:46,718 INFO L82 PathProgramCache]: Analyzing trace with hash -790062692, now seen corresponding path program 1 times [2020-11-28 03:20:46,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:46,718 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112341567] [2020-11-28 03:20:46,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:46,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:46,730 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:46,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:46,749 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:46,758 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:46,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:46,759 INFO L82 PathProgramCache]: Analyzing trace with hash 125202860, now seen corresponding path program 1 times [2020-11-28 03:20:46,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:46,759 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976087438] [2020-11-28 03:20:46,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:46,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:46,778 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:46,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:46,785 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:46,787 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:46,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:46,788 INFO L82 PathProgramCache]: Analyzing trace with hash -2019382713, now seen corresponding path program 1 times [2020-11-28 03:20:46,788 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:46,788 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492482867] [2020-11-28 03:20:46,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:46,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-28 03:20:46,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:20:46,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:20:46,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-28 03:20:46,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-11-28 03:20:46,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:20:46,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:20:46,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-28 03:20:46,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:46,989 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-11-28 03:20:46,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492482867] [2020-11-28 03:20:46,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083266493] [2020-11-28 03:20:46,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:47,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:47,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-28 03:20:47,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:47,107 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-11-28 03:20:47,107 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:47,107 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-11-28 03:20:47,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730033491] [2020-11-28 03:20:47,382 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:47,383 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:47,383 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:47,383 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:47,383 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:20:47,383 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:47,383 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:47,383 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:47,383 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-11-28 03:20:47,383 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:47,383 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:47,384 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:47,397 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:47,400 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:47,442 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:47,443 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:47,447 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:47,447 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:47,472 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:20:47,472 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:49,243 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:20:49,245 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:49,245 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:49,246 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:49,246 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:49,246 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:20:49,246 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:49,246 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:49,246 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:49,246 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-11-28 03:20:49,246 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:49,246 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:49,247 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:49,260 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:49,262 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:49,323 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:49,323 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:49,338 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 [2020-11-28 03:20:49,339 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:49,340 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:49,340 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:49,340 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:49,340 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:49,341 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:49,341 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:49,349 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:49,387 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 [2020-11-28 03:20:49,388 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:49,388 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:49,388 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:49,388 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:49,389 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:49,389 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:49,389 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 [2020-11-28 03:20:49,391 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:49,430 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 [2020-11-28 03:20:49,432 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:49,432 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:49,432 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:49,432 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:49,432 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:49,435 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:49,435 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:49,440 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:20:49,445 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-28 03:20:49,445 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:49,448 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:20:49,448 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:20:49,448 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:20:49,448 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 [2020-11-28 03:20:49,483 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:20:49,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:49,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:49,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-28 03:20:49,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:49,649 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:49,654 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:49,692 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:49,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:49,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-28 03:20:49,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:49,990 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-28 03:20:49,991 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 [2020-11-28 03:20:49,991 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 113 states and 157 transitions. cyclomatic complexity: 51 Second operand 11 states. [2020-11-28 03:20:50,502 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. [2020-11-28 03:20:50,506 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 [2020-11-28 03:20:50,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 03:20:50,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 52 transitions. [2020-11-28 03:20:50,507 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 24 letters. [2020-11-28 03:20:50,508 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:50,510 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 49 letters. Loop has 24 letters. [2020-11-28 03:20:50,511 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:50,512 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 48 letters. [2020-11-28 03:20:50,513 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:50,514 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 584 states and 903 transitions. [2020-11-28 03:20:50,530 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-11-28 03:20:50,550 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 584 states to 432 states and 649 transitions. [2020-11-28 03:20:50,551 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 140 [2020-11-28 03:20:50,551 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 141 [2020-11-28 03:20:50,551 INFO L73 IsDeterministic]: Start isDeterministic. Operand 432 states and 649 transitions. [2020-11-28 03:20:50,552 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:50,552 INFO L691 BuchiCegarLoop]: Abstraction has 432 states and 649 transitions. [2020-11-28 03:20:50,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states and 649 transitions. [2020-11-28 03:20:50,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 383. [2020-11-28 03:20:50,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 383 states. [2020-11-28 03:20:50,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 534 transitions. [2020-11-28 03:20:50,606 INFO L714 BuchiCegarLoop]: Abstraction has 383 states and 534 transitions. [2020-11-28 03:20:50,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:50,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-28 03:20:50,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-11-28 03:20:50,607 INFO L87 Difference]: Start difference. First operand 383 states and 534 transitions. Second operand 11 states. [2020-11-28 03:20:50,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:50,860 INFO L93 Difference]: Finished difference Result 442 states and 645 transitions. [2020-11-28 03:20:50,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-28 03:20:50,862 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 442 states and 645 transitions. [2020-11-28 03:20:50,870 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-11-28 03:20:50,885 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 442 states to 349 states and 495 transitions. [2020-11-28 03:20:50,888 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 131 [2020-11-28 03:20:50,889 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 135 [2020-11-28 03:20:50,889 INFO L73 IsDeterministic]: Start isDeterministic. Operand 349 states and 495 transitions. [2020-11-28 03:20:50,891 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:50,895 INFO L691 BuchiCegarLoop]: Abstraction has 349 states and 495 transitions. [2020-11-28 03:20:50,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states and 495 transitions. [2020-11-28 03:20:50,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 314. [2020-11-28 03:20:50,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-11-28 03:20:50,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 415 transitions. [2020-11-28 03:20:50,921 INFO L714 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-11-28 03:20:50,921 INFO L594 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-11-28 03:20:50,921 INFO L427 BuchiCegarLoop]: ======== Iteration 6============ [2020-11-28 03:20:50,921 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 314 states and 415 transitions. [2020-11-28 03:20:50,938 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-11-28 03:20:50,938 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:50,938 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:50,940 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:50,941 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-28 03:20:50,941 INFO L794 eck$LassoCheckResult]: Stem: 3449#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 3450#L25 call main_#t~ret6 := rec2(main_~x~0);< 3467#rec2ENTRY ~j := #in~j; 3489#L18 assume !(~j <= 0); 3469#L20 call #t~ret3 := rec1(~j - 1);< 3487#rec1ENTRY ~i := #in~i; 3503#L12 assume !(~i <= 0); 3497#L14 call #t~ret0 := rec1(~i - 2);< 3502#rec1ENTRY ~i := #in~i; 3507#L12 assume ~i <= 0;#res := 0; 3561#rec1FINAL assume true; 3558#rec1EXIT >#27#return; 3553#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 3554#rec1ENTRY ~i := #in~i; 3557#L12 assume ~i <= 0;#res := 0; 3556#rec1FINAL assume true; 3552#rec1EXIT >#29#return; 3547#L14-2 call #t~ret2 := rec1(#t~ret1);< 3550#rec1ENTRY ~i := #in~i; 3555#L12 assume ~i <= 0;#res := 0; 3551#rec1FINAL assume true; 3549#rec1EXIT >#31#return; 3545#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret0;havoc #t~ret1; 3582#rec1FINAL assume true; 3468#rec1EXIT >#33#return; 3388#L20-1 call #t~ret4 := rec2(#t~ret3);< 3387#rec2ENTRY ~j := #in~j; 3389#L18 assume !(~j <= 0); 3534#L20 call #t~ret3 := rec1(~j - 1);< 3474#rec1ENTRY ~i := #in~i; 3580#L12 assume !(~i <= 0); 3418#L14 call #t~ret0 := rec1(~i - 2);< 3452#rec1ENTRY [2020-11-28 03:20:50,941 INFO L796 eck$LassoCheckResult]: Loop: 3452#rec1ENTRY ~i := #in~i; 3566#L12 assume !(~i <= 0); 3417#L14 call #t~ret0 := rec1(~i - 2);< 3452#rec1ENTRY [2020-11-28 03:20:50,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:50,942 INFO L82 PathProgramCache]: Analyzing trace with hash -744961728, now seen corresponding path program 2 times [2020-11-28 03:20:50,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:50,942 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111998289] [2020-11-28 03:20:50,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:50,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-28 03:20:51,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:20:51,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:20:51,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-28 03:20:51,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,071 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-11-28 03:20:51,072 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111998289] [2020-11-28 03:20:51,072 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034897740] [2020-11-28 03:20:51,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:51,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 03:20:51,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:20:51,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-28 03:20:51,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:51,150 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-11-28 03:20:51,151 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:51,152 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2020-11-28 03:20:51,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318810687] [2020-11-28 03:20:51,155 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-11-28 03:20:51,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:51,155 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2020-11-28 03:20:51,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:51,156 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68130799] [2020-11-28 03:20:51,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:51,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:51,161 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:51,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:51,163 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:51,164 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:51,193 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:51,193 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:51,193 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:51,193 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:51,193 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:20:51,193 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:51,193 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:51,194 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:51,194 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-11-28 03:20:51,194 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:51,194 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:51,194 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,197 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,204 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,212 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,215 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,218 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,249 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:51,249 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:51,256 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:51,256 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:51,258 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:51,258 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:51,282 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:51,282 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:51,306 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:20:51,306 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:51,375 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:20:51,376 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:51,377 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:51,377 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:51,377 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:51,377 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:20:51,377 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:51,377 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:51,377 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:51,377 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-11-28 03:20:51,377 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:51,377 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:51,378 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,380 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,398 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,401 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,403 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,405 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:51,450 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:51,450 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:51,459 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 [2020-11-28 03:20:51,460 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:51,460 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:51,461 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:51,461 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:51,461 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:51,462 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:51,462 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 [2020-11-28 03:20:51,464 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:51,506 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 [2020-11-28 03:20:51,508 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:51,508 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:51,508 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:51,508 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:51,508 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:51,509 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:51,509 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:51,512 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:20:51,514 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:20:51,515 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:51,518 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:20:51,518 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:20:51,518 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:20:51,518 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:51,544 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:20:51,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:51,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-28 03:20:51,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:51,634 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:51,637 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:51,683 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:51,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:20:51,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:51,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:51,741 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 [2020-11-28 03:20:51,741 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-11-28 03:20:51,846 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. [2020-11-28 03:20:51,848 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 [2020-11-28 03:20:51,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:20:51,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-11-28 03:20:51,849 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-11-28 03:20:51,850 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:51,850 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:20:51,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:51,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-28 03:20:51,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:51,954 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:51,957 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:51,961 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:51,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:51,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:20:51,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:52,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:52,005 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 [2020-11-28 03:20:52,005 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-11-28 03:20:52,115 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. [2020-11-28 03:20:52,115 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 [2020-11-28 03:20:52,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:20:52,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-11-28 03:20:52,116 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-11-28 03:20:52,116 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:52,116 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:20:52,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:52,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:52,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-28 03:20:52,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:52,204 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:52,207 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:52,211 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:52,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:52,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:20:52,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:52,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:52,259 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 [2020-11-28 03:20:52,259 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-11-28 03:20:52,417 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. [2020-11-28 03:20:52,420 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 [2020-11-28 03:20:52,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:20:52,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-11-28 03:20:52,420 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-11-28 03:20:52,421 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:52,421 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 35 letters. Loop has 3 letters. [2020-11-28 03:20:52,421 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:52,421 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 6 letters. [2020-11-28 03:20:52,423 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:52,424 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 485 states and 616 transitions. [2020-11-28 03:20:52,433 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 26 [2020-11-28 03:20:52,443 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 485 states to 395 states and 526 transitions. [2020-11-28 03:20:52,443 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 129 [2020-11-28 03:20:52,444 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 136 [2020-11-28 03:20:52,444 INFO L73 IsDeterministic]: Start isDeterministic. Operand 395 states and 526 transitions. [2020-11-28 03:20:52,450 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:52,450 INFO L691 BuchiCegarLoop]: Abstraction has 395 states and 526 transitions. [2020-11-28 03:20:52,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states and 526 transitions. [2020-11-28 03:20:52,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 351. [2020-11-28 03:20:52,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-11-28 03:20:52,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 456 transitions. [2020-11-28 03:20:52,472 INFO L714 BuchiCegarLoop]: Abstraction has 351 states and 456 transitions. [2020-11-28 03:20:52,472 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:52,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-28 03:20:52,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-11-28 03:20:52,473 INFO L87 Difference]: Start difference. First operand 351 states and 456 transitions. Second operand 10 states. [2020-11-28 03:20:52,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:52,598 INFO L93 Difference]: Finished difference Result 378 states and 513 transitions. [2020-11-28 03:20:52,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-11-28 03:20:52,599 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 378 states and 513 transitions. [2020-11-28 03:20:52,606 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-11-28 03:20:52,608 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 378 states to 104 states and 142 transitions. [2020-11-28 03:20:52,608 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 98 [2020-11-28 03:20:52,608 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 98 [2020-11-28 03:20:52,609 INFO L73 IsDeterministic]: Start isDeterministic. Operand 104 states and 142 transitions. [2020-11-28 03:20:52,609 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:52,609 INFO L691 BuchiCegarLoop]: Abstraction has 104 states and 142 transitions. [2020-11-28 03:20:52,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states and 142 transitions. [2020-11-28 03:20:52,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 86. [2020-11-28 03:20:52,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-11-28 03:20:52,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 106 transitions. [2020-11-28 03:20:52,614 INFO L714 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-11-28 03:20:52,614 INFO L594 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-11-28 03:20:52,614 INFO L427 BuchiCegarLoop]: ======== Iteration 7============ [2020-11-28 03:20:52,614 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 86 states and 106 transitions. [2020-11-28 03:20:52,615 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-11-28 03:20:52,615 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:52,616 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:52,616 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:52,616 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-28 03:20:52,616 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 [2020-11-28 03:20:52,616 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 [2020-11-28 03:20:52,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:52,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1371444593, now seen corresponding path program 3 times [2020-11-28 03:20:52,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:52,617 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326107898] [2020-11-28 03:20:52,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:52,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:52,628 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:52,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:52,632 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:52,634 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:52,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:52,634 INFO L82 PathProgramCache]: Analyzing trace with hash 54781, now seen corresponding path program 4 times [2020-11-28 03:20:52,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:52,636 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95808204] [2020-11-28 03:20:52,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:52,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:52,642 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:52,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:52,647 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:52,647 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:52,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:52,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1318041775, now seen corresponding path program 4 times [2020-11-28 03:20:52,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:52,648 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881320763] [2020-11-28 03:20:52,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:52,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:52,653 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:52,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:52,659 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:52,665 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:52,702 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:52,702 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:52,702 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:52,702 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:52,702 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:20:52,702 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:52,702 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:52,702 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:52,702 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-11-28 03:20:52,703 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:52,703 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:52,704 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:52,712 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:52,715 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:52,718 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:52,721 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:52,781 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:52,781 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/bin/uautomizer/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:20:52,791 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:52,791 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:52,838 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:20:52,838 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:57,110 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:20:57,112 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:57,112 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:57,112 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:57,112 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:57,112 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:20:57,112 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:57,112 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:57,112 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:57,113 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-11-28 03:20:57,113 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:57,113 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:57,113 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:57,121 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:57,123 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:57,125 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:57,127 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:57,178 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:57,178 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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) [2020-11-28 03:20:57,182 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 [2020-11-28 03:20:57,183 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:57,183 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:57,183 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:57,184 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:57,184 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:57,185 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:57,185 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:57,188 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:20:57,190 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:20:57,191 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:57,194 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:20:57,194 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:20:57,194 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:20:57,195 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_~i) = 1*rec1_~i Supporting invariants [] [2020-11-28 03:20:57,227 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:20:57,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:57,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-28 03:20:57,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:57,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:20:57,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:57,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:57,323 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 [2020-11-28 03:20:57,323 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 86 states and 106 transitions. cyclomatic complexity: 23 Second operand 4 states. [2020-11-28 03:20:57,367 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. [2020-11-28 03:20:57,368 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 [2020-11-28 03:20:57,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-11-28 03:20:57,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 13 transitions. [2020-11-28 03:20:57,369 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 3 letters. [2020-11-28 03:20:57,369 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:57,369 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 13 letters. Loop has 3 letters. [2020-11-28 03:20:57,369 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:57,370 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 6 letters. [2020-11-28 03:20:57,370 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:57,370 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 100 states and 124 transitions. [2020-11-28 03:20:57,372 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-11-28 03:20:57,377 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 100 states to 94 states and 117 transitions. [2020-11-28 03:20:57,377 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 83 [2020-11-28 03:20:57,377 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 84 [2020-11-28 03:20:57,377 INFO L73 IsDeterministic]: Start isDeterministic. Operand 94 states and 117 transitions. [2020-11-28 03:20:57,378 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:20:57,378 INFO L691 BuchiCegarLoop]: Abstraction has 94 states and 117 transitions. [2020-11-28 03:20:57,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states and 117 transitions. [2020-11-28 03:20:57,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2020-11-28 03:20:57,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-11-28 03:20:57,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 114 transitions. [2020-11-28 03:20:57,385 INFO L714 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-11-28 03:20:57,385 INFO L594 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-11-28 03:20:57,385 INFO L427 BuchiCegarLoop]: ======== Iteration 8============ [2020-11-28 03:20:57,385 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 114 transitions. [2020-11-28 03:20:57,386 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-11-28 03:20:57,386 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:20:57,387 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:20:57,388 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:57,389 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2020-11-28 03:20:57,389 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~ret2;havoc #t~ret0;havoc #t~ret1; 6466#rec1FINAL assume true; 6467#rec1EXIT >#27#return; 6422#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6456#rec1ENTRY [2020-11-28 03:20:57,390 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~ret2;havoc #t~ret0;havoc #t~ret1; 6466#rec1FINAL assume true; 6467#rec1EXIT >#27#return; 6423#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6456#rec1ENTRY [2020-11-28 03:20:57,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:57,390 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2020-11-28 03:20:57,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:57,391 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050162753] [2020-11-28 03:20:57,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:57,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:57,435 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:57,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:57,440 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:57,443 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:57,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:57,444 INFO L82 PathProgramCache]: Analyzing trace with hash -165506564, now seen corresponding path program 1 times [2020-11-28 03:20:57,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:57,444 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876208453] [2020-11-28 03:20:57,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:57,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:57,461 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:57,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:20:57,465 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:20:57,467 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:20:57,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:57,468 INFO L82 PathProgramCache]: Analyzing trace with hash 2126813793, now seen corresponding path program 2 times [2020-11-28 03:20:57,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:57,468 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261167106] [2020-11-28 03:20:57,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:57,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:20:57,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:20:57,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:20:57,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-28 03:20:57,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-11-28 03:20:57,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:20:57,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:20:57,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-28 03:20:57,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:57,590 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 24 proven. 29 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2020-11-28 03:20:57,590 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261167106] [2020-11-28 03:20:57,590 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133273494] [2020-11-28 03:20:57,590 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:57,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 03:20:57,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:20:57,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:20:57,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:57,679 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 109 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-11-28 03:20:57,679 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:57,679 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-11-28 03:20:57,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142898745] [2020-11-28 03:20:57,989 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:57,989 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:57,989 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:57,989 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:57,989 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:20:57,989 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:57,989 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:57,989 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:57,989 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-11-28 03:20:57,990 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:57,990 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:57,990 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:57,994 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,002 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,005 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,011 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,013 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,047 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:58,047 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,050 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:58,050 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:58,065 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:58,065 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,089 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:58,089 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:58,092 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:58,092 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,116 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:58,116 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:58,119 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:20:58,119 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,157 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:20:58,157 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,185 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:20:58,185 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:20:58,188 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:20:58,210 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:20:58,211 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:20:58,211 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:20:58,211 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:20:58,211 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:20:58,211 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:20:58,211 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:20:58,211 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:20:58,211 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-11-28 03:20:58,211 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:20:58,211 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:20:58,212 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,214 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,216 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,225 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,227 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,229 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:20:58,264 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:20:58,264 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,268 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 [2020-11-28 03:20:58,269 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:58,269 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:58,269 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:58,269 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:58,270 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:58,270 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:58,270 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:20:58,277 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,306 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 [2020-11-28 03:20:58,307 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:58,307 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:58,308 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:58,308 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:58,308 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:58,308 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:58,308 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:20:58,309 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,332 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 [2020-11-28 03:20:58,333 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:20:58,333 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:20:58,333 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:20:58,333 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:20:58,333 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:20:58,334 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:20:58,334 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:20:58,335 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:20:58,338 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-28 03:20:58,338 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_06aa16e1-847e-45c5-9bc4-e3428a6a5ada/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 [2020-11-28 03:20:58,340 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:20:58,340 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:20:58,340 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:20:58,341 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-11-28 03:20:58,363 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:20:58,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:58,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:58,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:20:58,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:58,449 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:58,452 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:58,454 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:58,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:58,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-28 03:20:58,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:58,653 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-28 03:20:58,653 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 [2020-11-28 03:20:58,654 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-11-28 03:20:58,727 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. [2020-11-28 03:20:58,727 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 [2020-11-28 03:20:58,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 03:20:58,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-11-28 03:20:58,728 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-11-28 03:20:58,728 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:58,728 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:20:58,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:58,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:58,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:20:58,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:58,900 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:58,903 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:58,906 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:58,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:58,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-28 03:20:58,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:59,115 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-28 03:20:59,115 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 [2020-11-28 03:20:59,116 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-11-28 03:20:59,199 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. [2020-11-28 03:20:59,201 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 [2020-11-28 03:20:59,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 03:20:59,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-11-28 03:20:59,202 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-11-28 03:20:59,203 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:59,203 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:20:59,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:59,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:59,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:20:59,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:59,287 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:59,289 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:59,292 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:59,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:59,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-28 03:20:59,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:59,505 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-28 03:20:59,506 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 [2020-11-28 03:20:59,506 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-11-28 03:20:59,841 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. [2020-11-28 03:20:59,842 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 [2020-11-28 03:20:59,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 03:20:59,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 38 transitions. [2020-11-28 03:20:59,842 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 38 transitions. Stem has 29 letters. Loop has 24 letters. [2020-11-28 03:20:59,843 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:20:59,843 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:20:59,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:59,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:59,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:20:59,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:59,929 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:59,932 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:59,937 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:59,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:59,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-28 03:20:59,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:21:00,137 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-28 03:21:00,138 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 [2020-11-28 03:21:00,138 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-11-28 03:21:00,758 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. [2020-11-28 03:21:00,761 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 [2020-11-28 03:21:00,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 03:21:00,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 49 transitions. [2020-11-28 03:21:00,762 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 24 letters. [2020-11-28 03:21:00,763 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:21:00,763 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 53 letters. Loop has 24 letters. [2020-11-28 03:21:00,764 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:21:00,765 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 48 letters. [2020-11-28 03:21:00,766 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:21:00,767 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 409 states and 515 transitions. [2020-11-28 03:21:00,773 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 62 [2020-11-28 03:21:00,777 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 409 states to 253 states and 345 transitions. [2020-11-28 03:21:00,778 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 154 [2020-11-28 03:21:00,778 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 164 [2020-11-28 03:21:00,778 INFO L73 IsDeterministic]: Start isDeterministic. Operand 253 states and 345 transitions. [2020-11-28 03:21:00,779 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:21:00,779 INFO L691 BuchiCegarLoop]: Abstraction has 253 states and 345 transitions. [2020-11-28 03:21:00,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states and 345 transitions. [2020-11-28 03:21:00,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 216. [2020-11-28 03:21:00,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-11-28 03:21:00,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 270 transitions. [2020-11-28 03:21:00,790 INFO L714 BuchiCegarLoop]: Abstraction has 216 states and 270 transitions. [2020-11-28 03:21:00,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:21:00,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 03:21:00,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:21:00,791 INFO L87 Difference]: Start difference. First operand 216 states and 270 transitions. Second operand 8 states. [2020-11-28 03:21:00,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:21:00,860 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-11-28 03:21:00,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 03:21:00,860 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 35 states and 37 transitions. [2020-11-28 03:21:00,861 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-28 03:21:00,861 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 35 states to 0 states and 0 transitions. [2020-11-28 03:21:00,861 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-11-28 03:21:00,861 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-11-28 03:21:00,861 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-11-28 03:21:00,861 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-11-28 03:21:00,862 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:21:00,862 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:21:00,862 INFO L594 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:21:00,862 INFO L427 BuchiCegarLoop]: ======== Iteration 9============ [2020-11-28 03:21:00,862 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2020-11-28 03:21:00,862 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-28 03:21:00,862 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2020-11-28 03:21:00,868 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 28.11 03:21:00 BoogieIcfgContainer [2020-11-28 03:21:00,869 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-11-28 03:21:00,871 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 03:21:00,871 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 03:21:00,872 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 03:21:00,872 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:20:41" (3/4) ... [2020-11-28 03:21:00,875 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-11-28 03:21:00,875 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 03:21:00,877 INFO L168 Benchmark]: Toolchain (without parser) took 19686.46 ms. Allocated memory was 86.0 MB in the beginning and 192.9 MB in the end (delta: 107.0 MB). Free memory was 54.8 MB in the beginning and 159.0 MB in the end (delta: -104.2 MB). Peak memory consumption was 1.2 MB. Max. memory is 16.1 GB. [2020-11-28 03:21:00,877 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 86.0 MB. Free memory is still 45.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:21:00,878 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.19 ms. Allocated memory is still 86.0 MB. Free memory was 54.7 MB in the beginning and 64.9 MB in the end (delta: -10.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 03:21:00,878 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.35 ms. Allocated memory is still 86.0 MB. Free memory was 64.9 MB in the beginning and 63.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:21:00,878 INFO L168 Benchmark]: Boogie Preprocessor took 15.63 ms. Allocated memory is still 86.0 MB. Free memory was 63.6 MB in the beginning and 62.6 MB in the end (delta: 984.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:21:00,879 INFO L168 Benchmark]: RCFGBuilder took 348.43 ms. Allocated memory is still 86.0 MB. Free memory was 62.6 MB in the beginning and 53.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-28 03:21:00,882 INFO L168 Benchmark]: BuchiAutomizer took 19038.63 ms. Allocated memory was 86.0 MB in the beginning and 192.9 MB in the end (delta: 107.0 MB). Free memory was 53.5 MB in the beginning and 160.0 MB in the end (delta: -106.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:21:00,882 INFO L168 Benchmark]: Witness Printer took 4.42 ms. Allocated memory is still 192.9 MB. Free memory was 160.0 MB in the beginning and 159.0 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:21:00,884 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 86.0 MB. Free memory is still 45.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 240.19 ms. Allocated memory is still 86.0 MB. Free memory was 54.7 MB in the beginning and 64.9 MB in the end (delta: -10.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 30.35 ms. Allocated memory is still 86.0 MB. Free memory was 64.9 MB in the beginning and 63.6 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 15.63 ms. Allocated memory is still 86.0 MB. Free memory was 63.6 MB in the beginning and 62.6 MB in the end (delta: 984.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 348.43 ms. Allocated memory is still 86.0 MB. Free memory was 62.6 MB in the beginning and 53.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * BuchiAutomizer took 19038.63 ms. Allocated memory was 86.0 MB in the beginning and 192.9 MB in the end (delta: 107.0 MB). Free memory was 53.5 MB in the beginning and 160.0 MB in the end (delta: -106.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Witness Printer took 4.42 ms. Allocated memory is still 192.9 MB. Free memory was 160.0 MB in the beginning and 159.0 MB in the end (delta: 1.0 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@4ca41efc 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 18.9s and 9 iterations. TraceHistogramMax:5. Analysis of lassos took 11.8s. Construction of modules took 1.2s. Büchi inclusion checks took 5.2s. 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 0.1s 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, 1.2s 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: 16ms VariablesStem: 0 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 0 MotzkinApplications: 2 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 14 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 7 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 6.6s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...