./Ultimate.py --spec ../../sv-benchmarks/c/properties/termination.prp --file ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for termination Using default analysis Version f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/config/AutomizerTermination.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c -s /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 0837a1e1d82be1b28ccf3514392f1b01c88a9160 .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.25-f470102 [2019-12-07 17:32:24,307 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 17:32:24,308 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 17:32:24,315 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 17:32:24,315 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 17:32:24,316 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 17:32:24,317 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 17:32:24,319 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 17:32:24,320 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 17:32:24,321 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 17:32:24,322 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 17:32:24,322 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 17:32:24,323 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 17:32:24,323 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 17:32:24,324 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 17:32:24,325 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 17:32:24,326 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 17:32:24,326 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 17:32:24,328 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 17:32:24,329 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 17:32:24,330 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 17:32:24,331 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 17:32:24,332 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 17:32:24,333 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 17:32:24,335 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 17:32:24,335 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 17:32:24,335 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 17:32:24,335 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 17:32:24,336 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 17:32:24,336 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 17:32:24,337 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 17:32:24,337 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 17:32:24,338 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 17:32:24,338 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 17:32:24,339 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 17:32:24,339 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 17:32:24,340 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 17:32:24,340 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 17:32:24,340 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 17:32:24,341 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 17:32:24,341 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 17:32:24,342 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf [2019-12-07 17:32:24,356 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 17:32:24,356 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 17:32:24,357 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-12-07 17:32:24,357 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-12-07 17:32:24,358 INFO L138 SettingsManager]: * Use SBE=true [2019-12-07 17:32:24,358 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2019-12-07 17:32:24,358 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2019-12-07 17:32:24,358 INFO L138 SettingsManager]: * Use old map elimination=false [2019-12-07 17:32:24,358 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2019-12-07 17:32:24,358 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2019-12-07 17:32:24,359 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2019-12-07 17:32:24,359 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 17:32:24,359 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-12-07 17:32:24,359 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 17:32:24,359 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 17:32:24,359 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2019-12-07 17:32:24,360 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2019-12-07 17:32:24,360 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2019-12-07 17:32:24,360 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 17:32:24,360 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2019-12-07 17:32:24,360 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 17:32:24,360 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2019-12-07 17:32:24,360 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 17:32:24,360 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-12-07 17:32:24,360 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2019-12-07 17:32:24,361 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 17:32:24,361 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-12-07 17:32:24,361 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 17:32:24,361 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2019-12-07 17:32:24,361 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2019-12-07 17:32:24,361 INFO L138 SettingsManager]: * TransformationType=MODULO_NEIGHBOR Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 -> 0837a1e1d82be1b28ccf3514392f1b01c88a9160 [2019-12-07 17:32:24,459 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 17:32:24,469 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 17:32:24,472 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 17:32:24,473 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 17:32:24,474 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 17:32:24,474 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/../../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c [2019-12-07 17:32:24,514 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/data/cf0679138/5f1daaa65dbe48338404cab4c4ac37d1/FLAGcde9d394c [2019-12-07 17:32:24,954 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 17:32:24,954 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c [2019-12-07 17:32:24,958 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/data/cf0679138/5f1daaa65dbe48338404cab4c4ac37d1/FLAGcde9d394c [2019-12-07 17:32:24,967 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/data/cf0679138/5f1daaa65dbe48338404cab4c4ac37d1 [2019-12-07 17:32:24,969 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 17:32:24,969 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 17:32:24,970 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 17:32:24,970 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 17:32:24,972 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 17:32:24,973 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 05:32:24" (1/1) ... [2019-12-07 17:32:24,974 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32d8fdf2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:24, skipping insertion in model container [2019-12-07 17:32:24,975 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 05:32:24" (1/1) ... [2019-12-07 17:32:24,979 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 17:32:24,989 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 17:32:25,082 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 17:32:25,084 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 17:32:25,125 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 17:32:25,134 INFO L208 MainTranslator]: Completed translation [2019-12-07 17:32:25,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25 WrapperNode [2019-12-07 17:32:25,135 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 17:32:25,135 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 17:32:25,135 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 17:32:25,135 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 17:32:25,141 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,144 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,154 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 17:32:25,154 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 17:32:25,154 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 17:32:25,155 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 17:32:25,160 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,160 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,161 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,161 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,162 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,163 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,164 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... [2019-12-07 17:32:25,165 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 17:32:25,165 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 17:32:25,165 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 17:32:25,165 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 17:32:25,165 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:25,205 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2019-12-07 17:32:25,205 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2019-12-07 17:32:25,205 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2019-12-07 17:32:25,205 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2019-12-07 17:32:25,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 17:32:25,205 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 17:32:25,294 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 17:32:25,294 INFO L287 CfgBuilder]: Removed 4 assume(true) statements. [2019-12-07 17:32:25,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:32:25 BoogieIcfgContainer [2019-12-07 17:32:25,295 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 17:32:25,295 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2019-12-07 17:32:25,295 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2019-12-07 17:32:25,297 INFO L275 PluginConnector]: BuchiAutomizer initialized [2019-12-07 17:32:25,298 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2019-12-07 17:32:25,298 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 07.12 05:32:24" (1/3) ... [2019-12-07 17:32:25,299 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@52bc717a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 07.12 05:32:25, skipping insertion in model container [2019-12-07 17:32:25,299 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2019-12-07 17:32:25,299 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:32:25" (2/3) ... [2019-12-07 17:32:25,299 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@52bc717a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 07.12 05:32:25, skipping insertion in model container [2019-12-07 17:32:25,299 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2019-12-07 17:32:25,299 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:32:25" (3/3) ... [2019-12-07 17:32:25,300 INFO L371 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1d.c [2019-12-07 17:32:25,329 INFO L356 BuchiCegarLoop]: Interprodecural is true [2019-12-07 17:32:25,329 INFO L357 BuchiCegarLoop]: Hoare is false [2019-12-07 17:32:25,329 INFO L358 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2019-12-07 17:32:25,329 INFO L359 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 17:32:25,329 INFO L360 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 17:32:25,329 INFO L361 BuchiCegarLoop]: Difference is false [2019-12-07 17:32:25,330 INFO L362 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 17:32:25,330 INFO L365 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2019-12-07 17:32:25,339 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2019-12-07 17:32:25,355 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:25,355 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-12-07 17:32:25,355 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-12-07 17:32:25,360 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2019-12-07 17:32:25,360 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:25,360 INFO L424 BuchiCegarLoop]: ======== Iteration 1============ [2019-12-07 17:32:25,360 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2019-12-07 17:32:25,362 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:25,362 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-12-07 17:32:25,363 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-12-07 17:32:25,363 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2019-12-07 17:32:25,363 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:25,368 INFO L794 eck$LassoCheckResult]: Stem: 13#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 22#L25true call main_#t~ret6 := rec2(main_~x~0);< 3#rec2ENTRYtrue [2019-12-07 17:32:25,368 INFO L796 eck$LassoCheckResult]: Loop: 3#rec2ENTRYtrue ~j := #in~j; 20#L18true assume !(~j <= 0); 18#L20true call #t~ret3 := rec1(~j);< 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 - 1);< 3#rec2ENTRYtrue [2019-12-07 17:32:25,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:25,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2019-12-07 17:32:25,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:25,378 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383114714] [2019-12-07 17:32:25,379 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:25,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:25,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:25,441 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:25,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:25,442 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2019-12-07 17:32:25,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:25,442 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728311256] [2019-12-07 17:32:25,442 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:25,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:25,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:25,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:25,506 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728311256] [2019-12-07 17:32:25,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 17:32:25,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 17:32:25,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075935679] [2019-12-07 17:32:25,513 INFO L811 eck$LassoCheckResult]: loop already infeasible [2019-12-07 17:32:25,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:32:25,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 17:32:25,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 17:32:25,527 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 5 states. [2019-12-07 17:32:25,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:32:25,586 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2019-12-07 17:32:25,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 17:32:25,588 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 25 states and 33 transitions. [2019-12-07 17:32:25,590 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:25,595 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 25 states to 16 states and 22 transitions. [2019-12-07 17:32:25,595 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 16 [2019-12-07 17:32:25,596 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 16 [2019-12-07 17:32:25,596 INFO L73 IsDeterministic]: Start isDeterministic. Operand 16 states and 22 transitions. [2019-12-07 17:32:25,597 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2019-12-07 17:32:25,597 INFO L688 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2019-12-07 17:32:25,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states and 22 transitions. [2019-12-07 17:32:25,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-12-07 17:32:25,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-12-07 17:32:25,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 22 transitions. [2019-12-07 17:32:25,617 INFO L711 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2019-12-07 17:32:25,617 INFO L591 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2019-12-07 17:32:25,617 INFO L424 BuchiCegarLoop]: ======== Iteration 2============ [2019-12-07 17:32:25,617 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 16 states and 22 transitions. [2019-12-07 17:32:25,618 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:25,618 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-12-07 17:32:25,618 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-12-07 17:32:25,619 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2019-12-07 17:32:25,619 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:25,619 INFO L794 eck$LassoCheckResult]: Stem: 77#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; 64#L25 call main_#t~ret6 := rec2(main_~x~0);< 63#rec2ENTRY [2019-12-07 17:32:25,619 INFO L796 eck$LassoCheckResult]: Loop: 63#rec2ENTRY ~j := #in~j; 66#L18 assume !(~j <= 0); 71#L20 call #t~ret3 := rec1(~j);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume !(~i <= 0); 68#L14 call #t~ret0 := rec1(~i - 2);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#27#return; 69#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#29#return; 70#L14-2 call #t~ret2 := rec1(#t~ret1);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#31#return; 75#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret1;havoc #t~ret0; 76#rec1FINAL assume true; 78#rec1EXIT >#33#return; 65#L20-1 call #t~ret4 := rec2(#t~ret3 - 1);< 63#rec2ENTRY [2019-12-07 17:32:25,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:25,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 2 times [2019-12-07 17:32:25,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:25,620 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901925247] [2019-12-07 17:32:25,620 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:25,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:25,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:25,624 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:25,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:25,624 INFO L82 PathProgramCache]: Analyzing trace with hash -616266826, now seen corresponding path program 1 times [2019-12-07 17:32:25,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:25,624 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826303191] [2019-12-07 17:32:25,624 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:25,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:25,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:25,647 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:25,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:25,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1277860358, now seen corresponding path program 1 times [2019-12-07 17:32:25,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:25,648 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910780078] [2019-12-07 17:32:25,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:25,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:25,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:25,667 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:25,879 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:25,880 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:25,880 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:25,880 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:25,880 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2019-12-07 17:32:25,880 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:25,880 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:25,880 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:25,880 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration2_Loop [2019-12-07 17:32:25,880 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:25,881 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:25,893 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,897 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,898 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,900 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,901 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,928 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:25,928 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:25,932 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:25,933 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:25,939 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:25,939 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:25,942 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:25,943 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:25,945 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:25,946 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:25,949 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:25,949 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:25,952 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:25,952 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:25,956 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:25,956 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:25,959 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:25,959 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:25,962 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:25,963 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:25,970 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-12-07 17:32:25,970 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:25,976 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-12-07 17:32:25,976 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:25,977 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:25,977 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:25,977 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:25,977 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2019-12-07 17:32:25,977 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:25,977 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:25,977 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:25,977 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration2_Loop [2019-12-07 17:32:25,977 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:25,978 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:25,978 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,981 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,983 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,985 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:25,990 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,010 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:26,015 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,018 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 [2019-12-07 17:32:26,021 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,021 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,021 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,021 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,022 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,024 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,024 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,026 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,030 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 [2019-12-07 17:32:26,031 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,031 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,031 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,032 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,032 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,032 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,033 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,035 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,040 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 [2019-12-07 17:32:26,041 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,041 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,041 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,041 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,041 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,042 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,042 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,043 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:26,047 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 [2019-12-07 17:32:26,048 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,048 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,048 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,048 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,048 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,049 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,049 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,051 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-12-07 17:32:26,054 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-12-07 17:32:26,054 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:26,058 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-12-07 17:32:26,058 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-12-07 17:32:26,058 INFO L510 LassoAnalysis]: Proved termination. [2019-12-07 17:32:26,059 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#in~j) = 1*rec2_#in~j Supporting invariants [] [2019-12-07 17:32:26,061 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-12-07 17:32:26,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:26,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:26,090 INFO L264 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2019-12-07 17:32:26,091 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:26,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:26,123 INFO L264 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 19 conjunts are in the unsatisfiable core [2019-12-07 17:32:26,126 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:26,208 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-12-07 17:32:26,211 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 8 loop predicates [2019-12-07 17:32:26,211 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 16 states and 22 transitions. cyclomatic complexity: 8 Second operand 9 states. [2019-12-07 17:32:26,455 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 16 states and 22 transitions. cyclomatic complexity: 8. Second operand 9 states. Result 101 states and 147 transitions. Complement of second has 42 states. [2019-12-07 17:32:26,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 10 states 1 stem states 8 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:26,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2019-12-07 17:32:26,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 36 transitions. [2019-12-07 17:32:26,459 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 2 letters. Loop has 24 letters. [2019-12-07 17:32:26,460 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:26,460 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 26 letters. Loop has 24 letters. [2019-12-07 17:32:26,461 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:26,461 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 2 letters. Loop has 48 letters. [2019-12-07 17:32:26,462 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:26,462 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 101 states and 147 transitions. [2019-12-07 17:32:26,467 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:26,471 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 101 states to 89 states and 135 transitions. [2019-12-07 17:32:26,471 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 38 [2019-12-07 17:32:26,471 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 41 [2019-12-07 17:32:26,471 INFO L73 IsDeterministic]: Start isDeterministic. Operand 89 states and 135 transitions. [2019-12-07 17:32:26,472 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-12-07 17:32:26,472 INFO L688 BuchiCegarLoop]: Abstraction has 89 states and 135 transitions. [2019-12-07 17:32:26,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states and 135 transitions. [2019-12-07 17:32:26,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 62. [2019-12-07 17:32:26,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-12-07 17:32:26,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 98 transitions. [2019-12-07 17:32:26,484 INFO L711 BuchiCegarLoop]: Abstraction has 62 states and 98 transitions. [2019-12-07 17:32:26,485 INFO L591 BuchiCegarLoop]: Abstraction has 62 states and 98 transitions. [2019-12-07 17:32:26,485 INFO L424 BuchiCegarLoop]: ======== Iteration 3============ [2019-12-07 17:32:26,485 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 62 states and 98 transitions. [2019-12-07 17:32:26,486 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:26,486 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-12-07 17:32:26,486 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-12-07 17:32:26,487 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:26,487 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2019-12-07 17:32:26,487 INFO L794 eck$LassoCheckResult]: Stem: 375#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; 338#L25 call main_#t~ret6 := rec2(main_~x~0);< 337#rec2ENTRY ~j := #in~j; 340#L18 assume !(~j <= 0); 369#L20 call #t~ret3 := rec1(~j);< 382#rec1ENTRY ~i := #in~i; 368#L12 assume !(~i <= 0); 346#L14 call #t~ret0 := rec1(~i - 2);< 343#rec1ENTRY [2019-12-07 17:32:26,487 INFO L796 eck$LassoCheckResult]: Loop: 343#rec1ENTRY ~i := #in~i; 351#L12 assume !(~i <= 0); 344#L14 call #t~ret0 := rec1(~i - 2);< 343#rec1ENTRY [2019-12-07 17:32:26,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:26,488 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2019-12-07 17:32:26,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:26,488 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068940404] [2019-12-07 17:32:26,488 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:26,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,495 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:26,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:26,496 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2019-12-07 17:32:26,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:26,496 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535531957] [2019-12-07 17:32:26,496 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:26,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,500 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:26,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:26,500 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2019-12-07 17:32:26,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:26,500 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19859606] [2019-12-07 17:32:26,500 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:26,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,508 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:26,525 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:26,526 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:26,526 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:26,526 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:26,526 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2019-12-07 17:32:26,526 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,526 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:26,526 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:26,526 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration3_Loop [2019-12-07 17:32:26,526 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:26,526 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:26,527 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,535 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,537 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,538 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,539 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,543 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,558 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:26,559 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:26,561 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,561 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,564 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:26,564 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:26,568 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,568 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,570 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:26,570 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:26,574 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,574 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,577 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:26,577 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,581 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,581 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,583 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:26,584 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,587 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,587 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,592 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-12-07 17:32:26,593 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,634 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-12-07 17:32:26,635 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:26,635 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:26,635 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:26,635 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:26,635 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2019-12-07 17:32:26,635 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,635 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:26,635 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:26,635 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration3_Loop [2019-12-07 17:32:26,636 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:26,636 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:26,636 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,638 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,639 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,640 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,643 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,644 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,659 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:26,659 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,662 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 [2019-12-07 17:32:26,663 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,663 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,663 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,663 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,663 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,663 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,664 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,665 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:26,668 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-12-07 17:32:26,669 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,670 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,670 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,670 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,670 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,670 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,670 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,671 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,675 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 [2019-12-07 17:32:26,676 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,676 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,676 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,676 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,676 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,677 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,677 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,678 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,682 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 [2019-12-07 17:32:26,683 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,683 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,683 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,683 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,683 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,684 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,684 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,685 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-12-07 17:32:26,688 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-12-07 17:32:26,688 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,690 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-12-07 17:32:26,690 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-12-07 17:32:26,691 INFO L510 LassoAnalysis]: Proved termination. [2019-12-07 17:32:26,691 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2019-12-07 17:32:26,692 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-12-07 17:32:26,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:26,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:26,714 INFO L264 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2019-12-07 17:32:26,715 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:26,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:26,721 INFO L264 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:26,721 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:26,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:26,735 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 [2019-12-07 17:32:26,735 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 62 states and 98 transitions. cyclomatic complexity: 40 Second operand 4 states. [2019-12-07 17:32:26,766 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 62 states and 98 transitions. cyclomatic complexity: 40. Second operand 4 states. Result 108 states and 165 transitions. Complement of second has 13 states. [2019-12-07 17:32:26,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:26,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2019-12-07 17:32:26,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 13 transitions. [2019-12-07 17:32:26,767 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 8 letters. Loop has 3 letters. [2019-12-07 17:32:26,767 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:26,767 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 11 letters. Loop has 3 letters. [2019-12-07 17:32:26,767 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:26,768 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 8 letters. Loop has 6 letters. [2019-12-07 17:32:26,768 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:26,768 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 108 states and 165 transitions. [2019-12-07 17:32:26,770 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:26,773 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 108 states to 96 states and 153 transitions. [2019-12-07 17:32:26,773 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 40 [2019-12-07 17:32:26,774 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 42 [2019-12-07 17:32:26,774 INFO L73 IsDeterministic]: Start isDeterministic. Operand 96 states and 153 transitions. [2019-12-07 17:32:26,774 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-12-07 17:32:26,774 INFO L688 BuchiCegarLoop]: Abstraction has 96 states and 153 transitions. [2019-12-07 17:32:26,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states and 153 transitions. [2019-12-07 17:32:26,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2019-12-07 17:32:26,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-12-07 17:32:26,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 143 transitions. [2019-12-07 17:32:26,783 INFO L711 BuchiCegarLoop]: Abstraction has 92 states and 143 transitions. [2019-12-07 17:32:26,783 INFO L591 BuchiCegarLoop]: Abstraction has 92 states and 143 transitions. [2019-12-07 17:32:26,783 INFO L424 BuchiCegarLoop]: ======== Iteration 4============ [2019-12-07 17:32:26,783 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 143 transitions. [2019-12-07 17:32:26,784 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:26,785 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-12-07 17:32:26,785 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-12-07 17:32:26,785 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:26,785 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2019-12-07 17:32:26,785 INFO L794 eck$LassoCheckResult]: Stem: 617#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; 618#L25 call main_#t~ret6 := rec2(main_~x~0);< 621#rec2ENTRY ~j := #in~j; 638#L18 assume !(~j <= 0); 592#L20 call #t~ret3 := rec1(~j);< 630#rec1ENTRY ~i := #in~i; 639#L12 assume !(~i <= 0); 580#L14 call #t~ret0 := rec1(~i - 2);< 579#rec1ENTRY ~i := #in~i; 582#L12 assume ~i <= 0;#res := 0; 641#rec1FINAL assume true; 626#rec1EXIT >#27#return; 591#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 594#rec1ENTRY [2019-12-07 17:32:26,785 INFO L796 eck$LassoCheckResult]: Loop: 594#rec1ENTRY ~i := #in~i; 634#L12 assume !(~i <= 0); 610#L14 call #t~ret0 := rec1(~i - 2);< 594#rec1ENTRY [2019-12-07 17:32:26,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:26,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2019-12-07 17:32:26,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:26,786 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232901225] [2019-12-07 17:32:26,786 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:26,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,794 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:26,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:26,794 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2019-12-07 17:32:26,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:26,794 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347338452] [2019-12-07 17:32:26,794 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:26,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:26,797 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:26,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:26,797 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2019-12-07 17:32:26,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:26,798 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71295139] [2019-12-07 17:32:26,798 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:26,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:26,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:26,823 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-12-07 17:32:26,823 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71295139] [2019-12-07 17:32:26,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 17:32:26,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-12-07 17:32:26,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692263795] [2019-12-07 17:32:26,838 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:26,839 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:26,839 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:26,839 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:26,839 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2019-12-07 17:32:26,839 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,839 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:26,839 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:26,839 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration4_Loop [2019-12-07 17:32:26,839 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:26,839 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:26,840 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,841 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,842 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,843 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,846 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,847 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,864 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:26,864 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:26,866 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,866 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,869 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:26,869 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,873 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,873 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,875 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:26,875 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,879 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,879 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,881 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:26,882 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,885 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:26,885 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,892 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-12-07 17:32:26,892 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:26,933 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-12-07 17:32:26,934 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:26,935 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:26,935 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:26,935 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:26,935 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2019-12-07 17:32:26,935 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,935 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:26,935 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:26,935 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration4_Loop [2019-12-07 17:32:26,935 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:26,935 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:26,936 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,937 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,938 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,941 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,942 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,943 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:26,980 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:26,980 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,984 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 [2019-12-07 17:32:26,985 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,985 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,985 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,985 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,986 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,986 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,986 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,987 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,992 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 [2019-12-07 17:32:26,993 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:26,993 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:26,993 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:26,993 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:26,993 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:26,994 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:26,994 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:26,995 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:26,999 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 [2019-12-07 17:32:27,000 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:27,000 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:27,000 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:27,000 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:27,000 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:27,001 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:27,001 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:27,002 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-12-07 17:32:27,004 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-12-07 17:32:27,004 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 32 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:27,007 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-12-07 17:32:27,007 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-12-07 17:32:27,007 INFO L510 LassoAnalysis]: Proved termination. [2019-12-07 17:32:27,007 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2019-12-07 17:32:27,009 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-12-07 17:32:27,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,032 INFO L264 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,034 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,051 INFO L264 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,052 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:27,065 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 [2019-12-07 17:32:27,065 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 143 transitions. cyclomatic complexity: 57 Second operand 5 states. [2019-12-07 17:32:27,115 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 143 transitions. cyclomatic complexity: 57. Second operand 5 states. Result 132 states and 207 transitions. Complement of second has 14 states. [2019-12-07 17:32:27,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:27,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-12-07 17:32:27,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2019-12-07 17:32:27,116 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 13 letters. Loop has 3 letters. [2019-12-07 17:32:27,117 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:27,117 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 16 letters. Loop has 3 letters. [2019-12-07 17:32:27,117 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:27,117 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 13 letters. Loop has 6 letters. [2019-12-07 17:32:27,117 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:27,117 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 132 states and 207 transitions. [2019-12-07 17:32:27,122 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:27,126 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 132 states to 120 states and 195 transitions. [2019-12-07 17:32:27,126 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 49 [2019-12-07 17:32:27,127 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 51 [2019-12-07 17:32:27,127 INFO L73 IsDeterministic]: Start isDeterministic. Operand 120 states and 195 transitions. [2019-12-07 17:32:27,127 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-12-07 17:32:27,127 INFO L688 BuchiCegarLoop]: Abstraction has 120 states and 195 transitions. [2019-12-07 17:32:27,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states and 195 transitions. [2019-12-07 17:32:27,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 116. [2019-12-07 17:32:27,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2019-12-07 17:32:27,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 185 transitions. [2019-12-07 17:32:27,139 INFO L711 BuchiCegarLoop]: Abstraction has 116 states and 185 transitions. [2019-12-07 17:32:27,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:32:27,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 17:32:27,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-12-07 17:32:27,139 INFO L87 Difference]: Start difference. First operand 116 states and 185 transitions. Second operand 6 states. [2019-12-07 17:32:27,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:32:27,167 INFO L93 Difference]: Finished difference Result 129 states and 195 transitions. [2019-12-07 17:32:27,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-12-07 17:32:27,168 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 129 states and 195 transitions. [2019-12-07 17:32:27,171 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2019-12-07 17:32:27,175 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 129 states to 127 states and 193 transitions. [2019-12-07 17:32:27,175 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 59 [2019-12-07 17:32:27,175 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 59 [2019-12-07 17:32:27,175 INFO L73 IsDeterministic]: Start isDeterministic. Operand 127 states and 193 transitions. [2019-12-07 17:32:27,175 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-12-07 17:32:27,175 INFO L688 BuchiCegarLoop]: Abstraction has 127 states and 193 transitions. [2019-12-07 17:32:27,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states and 193 transitions. [2019-12-07 17:32:27,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 104. [2019-12-07 17:32:27,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-12-07 17:32:27,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 157 transitions. [2019-12-07 17:32:27,186 INFO L711 BuchiCegarLoop]: Abstraction has 104 states and 157 transitions. [2019-12-07 17:32:27,186 INFO L591 BuchiCegarLoop]: Abstraction has 104 states and 157 transitions. [2019-12-07 17:32:27,186 INFO L424 BuchiCegarLoop]: ======== Iteration 5============ [2019-12-07 17:32:27,186 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 104 states and 157 transitions. [2019-12-07 17:32:27,188 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2019-12-07 17:32:27,188 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-12-07 17:32:27,188 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-12-07 17:32:27,189 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:27,189 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:27,189 INFO L794 eck$LassoCheckResult]: Stem: 1186#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; 1187#L25 call main_#t~ret6 := rec2(main_~x~0);< 1194#rec2ENTRY ~j := #in~j; 1208#L18 assume !(~j <= 0); 1200#L20 call #t~ret3 := rec1(~j);< 1207#rec1ENTRY ~i := #in~i; 1206#L12 assume !(~i <= 0); 1154#L14 call #t~ret0 := rec1(~i - 2);< 1205#rec1ENTRY ~i := #in~i; 1203#L12 assume !(~i <= 0); 1165#L14 call #t~ret0 := rec1(~i - 2);< 1202#rec1ENTRY ~i := #in~i; 1204#L12 assume ~i <= 0;#res := 0; 1229#rec1FINAL assume true; 1184#rec1EXIT >#27#return; 1147#L14-1 [2019-12-07 17:32:27,189 INFO L796 eck$LassoCheckResult]: Loop: 1147#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1145#rec1ENTRY ~i := #in~i; 1148#L12 assume ~i <= 0;#res := 0; 1221#rec1FINAL assume true; 1215#rec1EXIT >#29#return; 1160#L14-2 call #t~ret2 := rec1(#t~ret1);< 1182#rec1ENTRY ~i := #in~i; 1218#L12 assume !(~i <= 0); 1162#L14 call #t~ret0 := rec1(~i - 2);< 1182#rec1ENTRY ~i := #in~i; 1218#L12 assume ~i <= 0;#res := 0; 1217#rec1FINAL assume true; 1216#rec1EXIT >#27#return; 1147#L14-1 [2019-12-07 17:32:27,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,189 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2019-12-07 17:32:27,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:27,190 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302624018] [2019-12-07 17:32:27,190 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:27,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:27,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:27,201 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:27,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2019-12-07 17:32:27,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:27,202 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858810071] [2019-12-07 17:32:27,202 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:27,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,229 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-12-07 17:32:27,229 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858810071] [2019-12-07 17:32:27,230 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875626549] [2019-12-07 17:32:27,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:27,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,252 INFO L264 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,253 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,255 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:27,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-12-07 17:32:27,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2019-12-07 17:32:27,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982519961] [2019-12-07 17:32:27,256 INFO L811 eck$LassoCheckResult]: loop already infeasible [2019-12-07 17:32:27,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:32:27,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 17:32:27,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-12-07 17:32:27,256 INFO L87 Difference]: Start difference. First operand 104 states and 157 transitions. cyclomatic complexity: 59 Second operand 6 states. [2019-12-07 17:32:27,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:32:27,289 INFO L93 Difference]: Finished difference Result 119 states and 173 transitions. [2019-12-07 17:32:27,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-12-07 17:32:27,289 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 119 states and 173 transitions. [2019-12-07 17:32:27,292 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:27,295 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 119 states to 114 states and 164 transitions. [2019-12-07 17:32:27,295 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 50 [2019-12-07 17:32:27,295 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2019-12-07 17:32:27,295 INFO L73 IsDeterministic]: Start isDeterministic. Operand 114 states and 164 transitions. [2019-12-07 17:32:27,295 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-12-07 17:32:27,295 INFO L688 BuchiCegarLoop]: Abstraction has 114 states and 164 transitions. [2019-12-07 17:32:27,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states and 164 transitions. [2019-12-07 17:32:27,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2019-12-07 17:32:27,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-12-07 17:32:27,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 161 transitions. [2019-12-07 17:32:27,305 INFO L711 BuchiCegarLoop]: Abstraction has 111 states and 161 transitions. [2019-12-07 17:32:27,305 INFO L591 BuchiCegarLoop]: Abstraction has 111 states and 161 transitions. [2019-12-07 17:32:27,305 INFO L424 BuchiCegarLoop]: ======== Iteration 6============ [2019-12-07 17:32:27,305 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 111 states and 161 transitions. [2019-12-07 17:32:27,306 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-12-07 17:32:27,306 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-12-07 17:32:27,306 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-12-07 17:32:27,307 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:27,307 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2019-12-07 17:32:27,308 INFO L794 eck$LassoCheckResult]: Stem: 1471#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1472#L25 call main_#t~ret6 := rec2(main_~x~0);< 1479#rec2ENTRY ~j := #in~j; 1501#L18 assume !(~j <= 0); 1481#L20 call #t~ret3 := rec1(~j);< 1494#rec1ENTRY ~i := #in~i; 1491#L12 assume !(~i <= 0); 1440#L14 call #t~ret0 := rec1(~i - 2);< 1488#rec1ENTRY ~i := #in~i; 1486#L12 assume !(~i <= 0); 1437#L14 call #t~ret0 := rec1(~i - 2);< 1485#rec1ENTRY ~i := #in~i; 1487#L12 assume ~i <= 0;#res := 0; 1505#rec1FINAL assume true; 1496#rec1EXIT >#27#return; 1448#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1449#rec1ENTRY ~i := #in~i; 1508#L12 assume ~i <= 0;#res := 0; 1507#rec1FINAL assume true; 1506#rec1EXIT >#29#return; 1428#L14-2 call #t~ret2 := rec1(#t~ret1);< 1427#rec1ENTRY ~i := #in~i; 1429#L12 assume ~i <= 0;#res := 0; 1465#rec1FINAL assume true; 1467#rec1EXIT >#31#return; 1460#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret1;havoc #t~ret0; 1434#rec1FINAL assume true; 1444#rec1EXIT >#27#return; 1441#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1474#rec1ENTRY [2019-12-07 17:32:27,308 INFO L796 eck$LassoCheckResult]: Loop: 1474#rec1ENTRY ~i := #in~i; 1504#L12 assume !(~i <= 0); 1438#L14 call #t~ret0 := rec1(~i - 2);< 1474#rec1ENTRY [2019-12-07 17:32:27,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2019-12-07 17:32:27,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:27,308 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721907668] [2019-12-07 17:32:27,308 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:27,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:27,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:27,326 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:27,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,326 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2019-12-07 17:32:27,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:27,326 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924516844] [2019-12-07 17:32:27,327 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:27,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:27,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:27,330 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:27,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,331 INFO L82 PathProgramCache]: Analyzing trace with hash -2050992272, now seen corresponding path program 2 times [2019-12-07 17:32:27,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:27,331 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369874715] [2019-12-07 17:32:27,331 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:27,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,400 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-12-07 17:32:27,400 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369874715] [2019-12-07 17:32:27,401 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116873188] [2019-12-07 17:32:27,401 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 17:32:27,423 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-12-07 17:32:27,423 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 17:32:27,423 INFO L264 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,425 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,430 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-12-07 17:32:27,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 17:32:27,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2019-12-07 17:32:27,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589085061] [2019-12-07 17:32:27,457 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:27,457 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:27,457 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:27,457 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:27,457 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2019-12-07 17:32:27,457 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:27,457 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:27,457 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:27,457 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration6_Loop [2019-12-07 17:32:27,457 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:27,457 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:27,458 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,459 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,460 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,461 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,465 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,467 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,484 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:27,484 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:27,487 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:27,487 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:27,490 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:27,490 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:27,496 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:27,496 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:27,498 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:27,498 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:27,503 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:27,503 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:27,506 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:27,506 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:27,510 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:27,510 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:27,516 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-12-07 17:32:27,516 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:27,521 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-12-07 17:32:27,523 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:27,523 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:27,523 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:27,523 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:27,523 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2019-12-07 17:32:27,523 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:27,523 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:27,523 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:27,523 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration6_Loop [2019-12-07 17:32:27,523 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:27,524 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:27,524 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,525 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,527 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,531 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,532 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,533 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:27,556 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:27,556 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 40 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 40 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:27,559 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 [2019-12-07 17:32:27,560 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:27,560 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:27,560 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:27,560 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:27,561 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:27,561 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:27,561 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:27,562 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:27,566 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 [2019-12-07 17:32:27,567 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:27,567 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:27,567 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:27,567 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:27,567 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:27,568 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:27,568 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:27,569 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:27,573 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 [2019-12-07 17:32:27,574 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:27,574 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:27,574 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:27,574 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:27,574 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:27,575 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:27,575 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:27,576 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-12-07 17:32:27,578 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-12-07 17:32:27,578 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:27,580 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-12-07 17:32:27,580 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-12-07 17:32:27,581 INFO L510 LassoAnalysis]: Proved termination. [2019-12-07 17:32:27,581 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2019-12-07 17:32:27,582 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-12-07 17:32:27,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,610 INFO L264 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,612 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,625 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,628 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,630 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,636 INFO L264 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,636 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:27,647 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 [2019-12-07 17:32:27,647 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2019-12-07 17:32:27,680 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 128 states and 179 transitions. Complement of second has 7 states. [2019-12-07 17:32:27,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:27,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-12-07 17:32:27,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2019-12-07 17:32:27,681 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 3 letters. [2019-12-07 17:32:27,681 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:27,681 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2019-12-07 17:32:27,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,710 INFO L264 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,711 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,725 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,727 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,730 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,737 INFO L264 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,738 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,751 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:27,751 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 [2019-12-07 17:32:27,751 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2019-12-07 17:32:27,785 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 128 states and 179 transitions. Complement of second has 7 states. [2019-12-07 17:32:27,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:27,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-12-07 17:32:27,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2019-12-07 17:32:27,786 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 3 letters. [2019-12-07 17:32:27,786 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:27,786 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2019-12-07 17:32:27,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,813 INFO L264 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,815 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,826 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,828 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,830 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:27,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,835 INFO L264 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:27,835 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:27,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:27,847 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 [2019-12-07 17:32:27,847 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2019-12-07 17:32:27,904 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 156 states and 218 transitions. Complement of second has 13 states. [2019-12-07 17:32:27,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:27,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-12-07 17:32:27,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2019-12-07 17:32:27,904 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 3 letters. [2019-12-07 17:32:27,905 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:27,905 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2019-12-07 17:32:27,905 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:27,905 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 6 letters. [2019-12-07 17:32:27,905 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:27,905 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 156 states and 218 transitions. [2019-12-07 17:32:27,907 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 15 [2019-12-07 17:32:27,909 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 156 states to 138 states and 200 transitions. [2019-12-07 17:32:27,909 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 54 [2019-12-07 17:32:27,909 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 57 [2019-12-07 17:32:27,909 INFO L73 IsDeterministic]: Start isDeterministic. Operand 138 states and 200 transitions. [2019-12-07 17:32:27,910 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-12-07 17:32:27,910 INFO L688 BuchiCegarLoop]: Abstraction has 138 states and 200 transitions. [2019-12-07 17:32:27,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states and 200 transitions. [2019-12-07 17:32:27,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 119. [2019-12-07 17:32:27,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-12-07 17:32:27,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 169 transitions. [2019-12-07 17:32:27,915 INFO L711 BuchiCegarLoop]: Abstraction has 119 states and 169 transitions. [2019-12-07 17:32:27,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:32:27,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-12-07 17:32:27,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2019-12-07 17:32:27,916 INFO L87 Difference]: Start difference. First operand 119 states and 169 transitions. Second operand 8 states. [2019-12-07 17:32:27,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:32:27,949 INFO L93 Difference]: Finished difference Result 97 states and 115 transitions. [2019-12-07 17:32:27,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-12-07 17:32:27,949 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 97 states and 115 transitions. [2019-12-07 17:32:27,950 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2019-12-07 17:32:27,951 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 97 states to 62 states and 74 transitions. [2019-12-07 17:32:27,951 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 11 [2019-12-07 17:32:27,951 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 11 [2019-12-07 17:32:27,951 INFO L73 IsDeterministic]: Start isDeterministic. Operand 62 states and 74 transitions. [2019-12-07 17:32:27,951 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-12-07 17:32:27,951 INFO L688 BuchiCegarLoop]: Abstraction has 62 states and 74 transitions. [2019-12-07 17:32:27,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states and 74 transitions. [2019-12-07 17:32:27,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2019-12-07 17:32:27,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-12-07 17:32:27,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2019-12-07 17:32:27,953 INFO L711 BuchiCegarLoop]: Abstraction has 53 states and 64 transitions. [2019-12-07 17:32:27,953 INFO L591 BuchiCegarLoop]: Abstraction has 53 states and 64 transitions. [2019-12-07 17:32:27,953 INFO L424 BuchiCegarLoop]: ======== Iteration 7============ [2019-12-07 17:32:27,953 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 53 states and 64 transitions. [2019-12-07 17:32:27,954 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2019-12-07 17:32:27,954 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-12-07 17:32:27,954 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-12-07 17:32:27,954 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:32:27,954 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2019-12-07 17:32:27,955 INFO L794 eck$LassoCheckResult]: Stem: 2675#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 2650#L25 call main_#t~ret6 := rec2(main_~x~0);< 2649#rec2ENTRY ~j := #in~j; 2651#L18 assume !(~j <= 0); 2679#L20 call #t~ret3 := rec1(~j);< 2690#rec1ENTRY ~i := #in~i; 2691#L12 assume !(~i <= 0); 2669#L14 call #t~ret0 := rec1(~i - 2);< 2688#rec1ENTRY ~i := #in~i; 2698#L12 assume ~i <= 0;#res := 0; 2701#rec1FINAL assume true; 2687#rec1EXIT >#27#return; 2661#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 2660#rec1ENTRY ~i := #in~i; 2663#L12 assume ~i <= 0;#res := 0; 2664#rec1FINAL assume true; 2665#rec1EXIT >#29#return; 2684#L14-2 call #t~ret2 := rec1(#t~ret1);< 2673#rec1ENTRY ~i := #in~i; 2686#L12 assume ~i <= 0;#res := 0; 2685#rec1FINAL assume true; 2683#rec1EXIT >#31#return; 2682#L14-3 #res := 1 + #t~ret2;havoc #t~ret2;havoc #t~ret1;havoc #t~ret0; 2681#rec1FINAL assume true; 2680#rec1EXIT >#33#return; 2653#L20-1 call #t~ret4 := rec2(#t~ret3 - 1);< 2652#rec2ENTRY ~j := #in~j; 2655#L18 assume !(~j <= 0); 2659#L20 call #t~ret3 := rec1(~j);< 2656#rec1ENTRY [2019-12-07 17:32:27,955 INFO L796 eck$LassoCheckResult]: Loop: 2656#rec1ENTRY ~i := #in~i; 2658#L12 assume !(~i <= 0); 2657#L14 call #t~ret0 := rec1(~i - 2);< 2656#rec1ENTRY [2019-12-07 17:32:27,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:27,955 INFO L82 PathProgramCache]: Analyzing trace with hash -1852176490, now seen corresponding path program 2 times [2019-12-07 17:32:27,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:27,955 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129742802] [2019-12-07 17:32:27,955 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:27,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:27,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:28,002 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-12-07 17:32:28,002 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129742802] [2019-12-07 17:32:28,002 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220240699] [2019-12-07 17:32:28,002 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 17:32:28,021 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-12-07 17:32:28,021 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 17:32:28,021 INFO L264 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:28,022 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:28,025 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-12-07 17:32:28,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 17:32:28,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2019-12-07 17:32:28,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652075962] [2019-12-07 17:32:28,026 INFO L799 eck$LassoCheckResult]: stem already infeasible [2019-12-07 17:32:28,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:28,026 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 4 times [2019-12-07 17:32:28,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:32:28,026 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023589425] [2019-12-07 17:32:28,027 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:32:28,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:28,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:32:28,029 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:32:28,051 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:28,052 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:28,052 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:28,052 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:28,052 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2019-12-07 17:32:28,052 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:28,052 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:28,052 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:28,052 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration7_Loop [2019-12-07 17:32:28,052 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:28,052 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:28,053 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,054 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,055 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,056 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,057 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,060 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,074 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:28,074 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:28,077 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:28,077 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:28,079 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:28,079 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:28,084 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:28,084 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:28,086 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:28,086 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:28,090 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:28,090 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:28,092 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:28,092 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:28,096 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:28,096 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:28,099 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-12-07 17:32:28,099 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:28,103 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-12-07 17:32:28,103 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:28,109 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-12-07 17:32:28,109 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-12-07 17:32:28,114 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-12-07 17:32:28,115 INFO L210 LassoAnalysis]: Preferences: [2019-12-07 17:32:28,115 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2019-12-07 17:32:28,115 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-12-07 17:32:28,115 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2019-12-07 17:32:28,115 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2019-12-07 17:32:28,115 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:28,115 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2019-12-07 17:32:28,115 INFO L132 ssoRankerPreferences]: Path of dumped script: [2019-12-07 17:32:28,115 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration7_Loop [2019-12-07 17:32:28,115 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2019-12-07 17:32:28,115 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-12-07 17:32:28,116 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,118 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,119 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,120 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,121 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,124 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-12-07 17:32:28,137 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-12-07 17:32:28,137 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/bin/uautomizer/z3 Starting monitored process 51 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 51 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-12-07 17:32:28,140 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 [2019-12-07 17:32:28,141 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:28,141 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:28,141 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:28,141 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:28,141 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:28,142 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:28,142 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:28,143 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:28,146 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 [2019-12-07 17:32:28,147 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:28,147 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:28,147 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:28,147 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:28,147 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:28,147 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:28,147 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:28,149 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:28,153 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 [2019-12-07 17:32:28,154 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:28,154 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:28,154 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:28,154 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:28,154 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:28,154 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:28,154 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:28,155 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:28,159 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 [2019-12-07 17:32:28,160 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:28,160 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:28,160 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:28,160 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:28,160 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:28,160 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:28,160 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:28,162 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:28,165 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 [2019-12-07 17:32:28,166 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2019-12-07 17:32:28,167 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-12-07 17:32:28,167 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2019-12-07 17:32:28,167 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2019-12-07 17:32:28,167 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2019-12-07 17:32:28,167 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-12-07 17:32:28,167 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-12-07 17:32:28,169 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-12-07 17:32:28,171 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-12-07 17:32:28,171 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_56687e18-7cbe-4b46-b4f2-c4e9daea99d5/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 [2019-12-07 17:32:28,173 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-12-07 17:32:28,174 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-12-07 17:32:28,174 INFO L510 LassoAnalysis]: Proved termination. [2019-12-07 17:32:28,174 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2019-12-07 17:32:28,175 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-12-07 17:32:28,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:28,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:28,201 INFO L264 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-12-07 17:32:28,202 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:28,212 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,214 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,215 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:28,220 INFO L264 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:28,220 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:28,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:28,231 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 [2019-12-07 17:32:28,232 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2019-12-07 17:32:28,269 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 63 states and 75 transitions. Complement of second has 13 states. [2019-12-07 17:32:28,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:28,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-12-07 17:32:28,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 10 transitions. [2019-12-07 17:32:28,270 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 10 transitions. Stem has 29 letters. Loop has 3 letters. [2019-12-07 17:32:28,270 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:28,270 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2019-12-07 17:32:28,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:28,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:28,296 INFO L264 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-12-07 17:32:28,298 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:28,308 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,310 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,311 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:28,317 INFO L264 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:28,317 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:28,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:28,328 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 [2019-12-07 17:32:28,329 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2019-12-07 17:32:28,365 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 63 states and 75 transitions. Complement of second has 13 states. [2019-12-07 17:32:28,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:28,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-12-07 17:32:28,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 10 transitions. [2019-12-07 17:32:28,366 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 10 transitions. Stem has 29 letters. Loop has 3 letters. [2019-12-07 17:32:28,366 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:28,366 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2019-12-07 17:32:28,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:32:28,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:28,393 INFO L264 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-12-07 17:32:28,394 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:28,405 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,406 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,408 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:32:28,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:32:28,414 INFO L264 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 17:32:28,414 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:32:28,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 17:32:28,427 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 [2019-12-07 17:32:28,427 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2019-12-07 17:32:28,479 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 77 states and 89 transitions. Complement of second has 13 states. [2019-12-07 17:32:28,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-12-07 17:32:28,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-12-07 17:32:28,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2019-12-07 17:32:28,480 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 3 letters. [2019-12-07 17:32:28,480 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:28,481 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2019-12-07 17:32:28,481 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:28,481 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 6 letters. [2019-12-07 17:32:28,481 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-12-07 17:32:28,482 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 77 states and 89 transitions. [2019-12-07 17:32:28,482 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2019-12-07 17:32:28,482 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 77 states to 0 states and 0 transitions. [2019-12-07 17:32:28,483 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2019-12-07 17:32:28,483 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2019-12-07 17:32:28,483 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2019-12-07 17:32:28,483 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2019-12-07 17:32:28,483 INFO L688 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-12-07 17:32:28,483 INFO L711 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-12-07 17:32:28,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:32:28,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-12-07 17:32:28,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2019-12-07 17:32:28,483 INFO L87 Difference]: Start difference. First operand 0 states and 0 transitions. Second operand 8 states. [2019-12-07 17:32:28,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:32:28,484 INFO L93 Difference]: Finished difference Result 0 states and 0 transitions. [2019-12-07 17:32:28,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-07 17:32:28,484 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 0 states and 0 transitions. [2019-12-07 17:32:28,484 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2019-12-07 17:32:28,484 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 0 states to 0 states and 0 transitions. [2019-12-07 17:32:28,484 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2019-12-07 17:32:28,484 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2019-12-07 17:32:28,484 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2019-12-07 17:32:28,485 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2019-12-07 17:32:28,485 INFO L688 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-12-07 17:32:28,485 INFO L711 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-12-07 17:32:28,485 INFO L591 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-12-07 17:32:28,485 INFO L424 BuchiCegarLoop]: ======== Iteration 8============ [2019-12-07 17:32:28,485 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2019-12-07 17:32:28,485 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2019-12-07 17:32:28,485 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2019-12-07 17:32:28,490 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 07.12 05:32:28 BoogieIcfgContainer [2019-12-07 17:32:28,490 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2019-12-07 17:32:28,490 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 17:32:28,490 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 17:32:28,490 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 17:32:28,491 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:32:25" (3/4) ... [2019-12-07 17:32:28,493 INFO L140 WitnessPrinter]: No result that supports witness generation found [2019-12-07 17:32:28,493 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 17:32:28,494 INFO L168 Benchmark]: Toolchain (without parser) took 3524.81 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 157.3 MB). Free memory was 944.7 MB in the beginning and 843.4 MB in the end (delta: 101.3 MB). Peak memory consumption was 258.6 MB. Max. memory is 11.5 GB. [2019-12-07 17:32:28,495 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 960.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:32:28,495 INFO L168 Benchmark]: CACSL2BoogieTranslator took 164.78 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 97.5 MB). Free memory was 944.7 MB in the beginning and 1.1 GB in the end (delta: -147.5 MB). Peak memory consumption was 23.3 MB. Max. memory is 11.5 GB. [2019-12-07 17:32:28,495 INFO L168 Benchmark]: Boogie Procedure Inliner took 19.21 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:32:28,496 INFO L168 Benchmark]: Boogie Preprocessor took 10.28 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:32:28,496 INFO L168 Benchmark]: RCFGBuilder took 129.97 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. [2019-12-07 17:32:28,496 INFO L168 Benchmark]: BuchiAutomizer took 3194.79 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 59.8 MB). Free memory was 1.1 GB in the beginning and 843.4 MB in the end (delta: 231.8 MB). Peak memory consumption was 291.6 MB. Max. memory is 11.5 GB. [2019-12-07 17:32:28,497 INFO L168 Benchmark]: Witness Printer took 3.06 ms. Allocated memory is still 1.2 GB. Free memory is still 843.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:32:28,499 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 960.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 164.78 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 97.5 MB). Free memory was 944.7 MB in the beginning and 1.1 GB in the end (delta: -147.5 MB). Peak memory consumption was 23.3 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 19.21 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.28 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 129.97 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. * BuchiAutomizer took 3194.79 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 59.8 MB). Free memory was 1.1 GB in the beginning and 843.4 MB in the end (delta: 231.8 MB). Peak memory consumption was 291.6 MB. Max. memory is 11.5 GB. * Witness Printer took 3.06 ms. Allocated memory is still 1.2 GB. Free memory is still 843.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: Constructed decomposition of program Your program was decomposed into 10 terminating modules (5 trivial, 3 deterministic, 2 nondeterministic). One deterministic module has affine ranking function \old(j) and consists of 10 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 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 5 locations. 5 modules have a trivial ranking function, the largest among these consists of 8 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 3.1s and 8 iterations. TraceHistogramMax:5. Analysis of lassos took 1.5s. Construction of modules took 0.2s. Büchi inclusion checks took 1.1s. Highest rank in rank-based complementation 3. Minimization of det autom 3. Minimization of nondet autom 7. Automata minimization 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 89 StatesRemovedByMinimization, 7 NontrivialMinimizations. Non-live state removal took 0.0s Buchi closure took 0.0s. Biggest automaton had 111 states and ocurred in iteration 5. Nontrivial modules had stage [3, 0, 2, 0, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 22/24 HoareTripleCheckerStatistics: 188 SDtfs, 186 SDslu, 297 SDs, 0 SdLazy, 307 SolverSat, 134 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time LassoAnalysisResults: nont0 unkn0 SFLI2 SFLT2 conc0 concLT2 SILN0 SILU0 SILI0 SILT1 lasso0 LassoPreprocessingBenchmarks: Lassos: inital11 mio100 ax100 hnf100 lsp100 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq151 hnf93 smp100 dnf100 smp100 tf112 neg100 sie111 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 10ms VariablesStem: 0 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 0 MotzkinApplications: 2 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 18 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 5 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 0.2s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...