./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 9a8b2e8d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerTermination.xml -i ../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(F end) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 0837a1e1d82be1b28ccf3514392f1b01c88a9160 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.25-9a8b2e8 [2020-10-20 06:32:58,894 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-20 06:32:58,898 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-20 06:32:58,936 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-20 06:32:58,936 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-20 06:32:58,946 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-20 06:32:58,948 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-20 06:32:58,951 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-20 06:32:58,954 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-20 06:32:58,963 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-20 06:32:58,964 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-20 06:32:58,965 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-20 06:32:58,965 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-20 06:32:58,966 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-20 06:32:58,968 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-20 06:32:58,969 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-20 06:32:58,969 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-20 06:32:58,970 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-20 06:32:58,972 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-20 06:32:58,974 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-20 06:32:58,975 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-20 06:32:58,976 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-20 06:32:58,977 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-20 06:32:58,978 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-20 06:32:58,980 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-20 06:32:58,981 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-20 06:32:58,981 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-20 06:32:58,982 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-20 06:32:58,982 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-20 06:32:58,983 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-20 06:32:58,983 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-20 06:32:58,984 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-20 06:32:58,985 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-20 06:32:58,986 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-20 06:32:58,987 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-20 06:32:58,987 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-20 06:32:58,988 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-20 06:32:58,988 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-20 06:32:58,988 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-20 06:32:58,989 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-20 06:32:58,990 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-20 06:32:58,991 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-10-20 06:32:59,015 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-20 06:32:59,015 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-20 06:32:59,016 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-20 06:32:59,017 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-20 06:32:59,017 INFO L138 SettingsManager]: * Use SBE=true [2020-10-20 06:32:59,017 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-10-20 06:32:59,017 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-10-20 06:32:59,018 INFO L138 SettingsManager]: * Use old map elimination=false [2020-10-20 06:32:59,018 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-10-20 06:32:59,018 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-10-20 06:32:59,018 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-10-20 06:32:59,019 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-20 06:32:59,019 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-10-20 06:32:59,019 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-20 06:32:59,019 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-20 06:32:59,020 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-10-20 06:32:59,020 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-10-20 06:32:59,020 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-10-20 06:32:59,020 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-20 06:32:59,021 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-10-20 06:32:59,021 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-20 06:32:59,021 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-10-20 06:32:59,021 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-20 06:32:59,022 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-20 06:32:59,022 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-10-20 06:32:59,022 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-20 06:32:59,022 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-20 06:32:59,023 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-20 06:32:59,023 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-10-20 06:32:59,024 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-10-20 06:32:59,024 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 -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0837a1e1d82be1b28ccf3514392f1b01c88a9160 [2020-10-20 06:32:59,223 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 06:32:59,244 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 06:32:59,248 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 06:32:59,250 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 06:32:59,250 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 06:32:59,251 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c [2020-10-20 06:32:59,312 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8fc2e95d6/5f652758c72643bdb5e2ecf6b19c2272/FLAGce2d0d393 [2020-10-20 06:32:59,751 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 06:32:59,751 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c [2020-10-20 06:32:59,759 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8fc2e95d6/5f652758c72643bdb5e2ecf6b19c2272/FLAGce2d0d393 [2020-10-20 06:33:00,096 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8fc2e95d6/5f652758c72643bdb5e2ecf6b19c2272 [2020-10-20 06:33:00,102 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 06:33:00,112 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 06:33:00,115 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 06:33:00,115 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 06:33:00,119 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 06:33:00,120 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,123 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5221da7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00, skipping insertion in model container [2020-10-20 06:33:00,124 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,134 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 06:33:00,152 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 06:33:00,374 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 06:33:00,379 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 06:33:00,396 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 06:33:00,411 INFO L208 MainTranslator]: Completed translation [2020-10-20 06:33:00,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00 WrapperNode [2020-10-20 06:33:00,412 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 06:33:00,414 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 06:33:00,414 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 06:33:00,414 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 06:33:00,424 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,430 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,448 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 06:33:00,449 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 06:33:00,449 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 06:33:00,449 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 06:33:00,457 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,457 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,458 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,458 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,462 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,464 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,464 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... [2020-10-20 06:33:00,466 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 06:33:00,466 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 06:33:00,466 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 06:33:00,466 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 06:33:00,469 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:00,532 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-10-20 06:33:00,533 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-10-20 06:33:00,533 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-10-20 06:33:00,533 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-10-20 06:33:00,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 06:33:00,533 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 06:33:00,693 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 06:33:00,694 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-10-20 06:33:00,696 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:33:00 BoogieIcfgContainer [2020-10-20 06:33:00,696 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 06:33:00,697 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-10-20 06:33:00,697 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-10-20 06:33:00,701 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-10-20 06:33:00,702 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:33:00,702 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 20.10 06:33:00" (1/3) ... [2020-10-20 06:33:00,704 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@2232bf11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 20.10 06:33:00, skipping insertion in model container [2020-10-20 06:33:00,704 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:33:00,704 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:33:00" (2/3) ... [2020-10-20 06:33:00,705 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@2232bf11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 20.10 06:33:00, skipping insertion in model container [2020-10-20 06:33:00,705 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:33:00,705 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:33:00" (3/3) ... [2020-10-20 06:33:00,707 INFO L373 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1d.c [2020-10-20 06:33:00,756 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-10-20 06:33:00,757 INFO L360 BuchiCegarLoop]: Hoare is false [2020-10-20 06:33:00,757 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-10-20 06:33:00,757 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 06:33:00,757 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 06:33:00,758 INFO L364 BuchiCegarLoop]: Difference is false [2020-10-20 06:33:00,758 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 06:33:00,758 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-10-20 06:33:00,774 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-10-20 06:33:00,798 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:00,798 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:00,798 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:00,806 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-20 06:33:00,806 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:00,806 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-10-20 06:33:00,806 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-10-20 06:33:00,809 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:00,809 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:00,809 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:00,810 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-20 06:33:00,810 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:00,816 INFO L794 eck$LassoCheckResult]: Stem: 13#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 22#L25true call main_#t~ret6 := rec2(main_~x~0);< 3#rec2ENTRYtrue [2020-10-20 06:33:00,817 INFO L796 eck$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 [2020-10-20 06:33:00,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:00,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2020-10-20 06:33:00,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:00,834 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4652473] [2020-10-20 06:33:00,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:00,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:00,897 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:00,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:00,901 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:00,919 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:00,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:00,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2020-10-20 06:33:00,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:00,922 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901974226] [2020-10-20 06:33:00,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:00,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:01,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:33:01,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:01,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:01,059 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901974226] [2020-10-20 06:33:01,060 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 06:33:01,061 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-20 06:33:01,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664371962] [2020-10-20 06:33:01,068 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-10-20 06:33:01,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:01,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-20 06:33:01,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-20 06:33:01,092 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 5 states. [2020-10-20 06:33:01,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:01,333 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2020-10-20 06:33:01,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-20 06:33:01,336 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 25 states and 33 transitions. [2020-10-20 06:33:01,340 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:01,348 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 25 states to 16 states and 22 transitions. [2020-10-20 06:33:01,349 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 16 [2020-10-20 06:33:01,349 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 16 [2020-10-20 06:33:01,350 INFO L73 IsDeterministic]: Start isDeterministic. Operand 16 states and 22 transitions. [2020-10-20 06:33:01,351 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-10-20 06:33:01,352 INFO L691 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2020-10-20 06:33:01,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states and 22 transitions. [2020-10-20 06:33:01,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-10-20 06:33:01,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-10-20 06:33:01,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 22 transitions. [2020-10-20 06:33:01,380 INFO L714 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2020-10-20 06:33:01,381 INFO L594 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2020-10-20 06:33:01,381 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-10-20 06:33:01,381 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 16 states and 22 transitions. [2020-10-20 06:33:01,382 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:01,383 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:01,383 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:01,384 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-20 06:33:01,385 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:01,385 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 [2020-10-20 06:33:01,385 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~ret0;havoc #t~ret2;havoc #t~ret1; 76#rec1FINAL assume true; 78#rec1EXIT >#33#return; 65#L20-1 call #t~ret4 := rec2(#t~ret3 - 1);< 63#rec2ENTRY [2020-10-20 06:33:01,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:01,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 2 times [2020-10-20 06:33:01,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:01,387 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155232176] [2020-10-20 06:33:01,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:01,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:01,390 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:01,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:01,393 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:01,401 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:01,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:01,402 INFO L82 PathProgramCache]: Analyzing trace with hash -616266826, now seen corresponding path program 1 times [2020-10-20 06:33:01,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:01,403 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853463591] [2020-10-20 06:33:01,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:01,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:01,422 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:01,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:01,438 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:01,443 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:01,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:01,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1277860358, now seen corresponding path program 1 times [2020-10-20 06:33:01,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:01,445 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999084872] [2020-10-20 06:33:01,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:01,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:01,462 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:01,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:01,482 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:01,487 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:01,737 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2020-10-20 06:33:01,922 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:01,923 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:01,924 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:01,924 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:01,924 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:01,924 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:01,924 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:01,924 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:01,925 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration2_Loop [2020-10-20 06:33:01,925 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:01,925 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:01,943 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:01,950 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:01,953 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:01,955 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:01,959 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:02,021 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:02,022 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2020-10-20 06:33:02,041 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:02,041 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:02,053 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:02,053 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:02,091 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:02,092 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:02,095 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:02,095 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2020-10-20 06:33:02,130 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:02,131 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:02,137 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:02,138 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:02,168 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:02,168 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:02,177 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:02,177 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2020-10-20 06:33:02,203 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:02,203 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:02,245 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:02,245 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:02,251 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:02,282 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:02,282 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:02,282 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:02,282 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:02,282 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:02,282 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:02,283 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:02,283 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:02,283 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration2_Loop [2020-10-20 06:33:02,284 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:02,284 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:02,285 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:02,293 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:02,296 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:02,301 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:02,309 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:02,345 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:02,351 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2020-10-20 06:33:02,365 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:02,367 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:02,367 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:02,368 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:02,368 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:02,368 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:02,371 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:02,373 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:02,378 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:02,415 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:02,417 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:02,417 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:02,418 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:02,418 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:02,418 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:02,419 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:02,420 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:02,427 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:02,456 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:02,458 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:02,458 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:02,458 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:02,458 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:02,459 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:02,460 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:02,460 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:02,468 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:02,515 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:02,517 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:02,518 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:02,518 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:02,518 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:02,518 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:02,521 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:02,521 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:02,527 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:02,532 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:33:02,533 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:02,542 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:02,542 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:02,542 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:02,543 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#in~j) = 1*rec2_#in~j Supporting invariants [] [2020-10-20 06:33:02,572 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:02,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:02,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:02,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-10-20 06:33:02,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:02,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:02,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 19 conjunts are in the unsatisfiable core [2020-10-20 06:33:02,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:02,880 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-10-20 06:33:02,884 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 [2020-10-20 06:33:02,885 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 16 states and 22 transitions. cyclomatic complexity: 8 Second operand 9 states. [2020-10-20 06:33:03,313 INFO L75 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. [2020-10-20 06:33:03,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 10 states 1 stem states 8 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:03,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-10-20 06:33:03,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 36 transitions. [2020-10-20 06:33:03,320 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 2 letters. Loop has 24 letters. [2020-10-20 06:33:03,322 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:03,323 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 26 letters. Loop has 24 letters. [2020-10-20 06:33:03,324 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:03,324 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 2 letters. Loop has 48 letters. [2020-10-20 06:33:03,325 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:03,325 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 101 states and 147 transitions. [2020-10-20 06:33:03,333 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:03,339 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 101 states to 89 states and 135 transitions. [2020-10-20 06:33:03,339 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 38 [2020-10-20 06:33:03,340 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 41 [2020-10-20 06:33:03,340 INFO L73 IsDeterministic]: Start isDeterministic. Operand 89 states and 135 transitions. [2020-10-20 06:33:03,342 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:03,342 INFO L691 BuchiCegarLoop]: Abstraction has 89 states and 135 transitions. [2020-10-20 06:33:03,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states and 135 transitions. [2020-10-20 06:33:03,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 62. [2020-10-20 06:33:03,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-10-20 06:33:03,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 98 transitions. [2020-10-20 06:33:03,360 INFO L714 BuchiCegarLoop]: Abstraction has 62 states and 98 transitions. [2020-10-20 06:33:03,360 INFO L594 BuchiCegarLoop]: Abstraction has 62 states and 98 transitions. [2020-10-20 06:33:03,360 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-10-20 06:33:03,360 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 62 states and 98 transitions. [2020-10-20 06:33:03,363 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:03,363 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:03,363 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:03,364 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:03,364 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-20 06:33:03,364 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 [2020-10-20 06:33:03,365 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 [2020-10-20 06:33:03,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:03,365 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2020-10-20 06:33:03,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:03,366 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702405399] [2020-10-20 06:33:03,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:03,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:03,372 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:03,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:03,376 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:03,378 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:03,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:03,379 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2020-10-20 06:33:03,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:03,380 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987030564] [2020-10-20 06:33:03,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:03,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:03,384 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:03,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:03,386 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:03,387 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:03,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:03,388 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2020-10-20 06:33:03,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:03,389 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844599588] [2020-10-20 06:33:03,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:03,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:03,395 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:03,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:03,401 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:03,403 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:03,446 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:03,447 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:03,447 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:03,447 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:03,447 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:03,447 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,447 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:03,447 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:03,448 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration3_Loop [2020-10-20 06:33:03,448 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:03,448 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:03,450 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,452 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,455 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,458 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,461 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,468 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,515 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:03,515 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:03,527 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:03,527 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,532 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:03,533 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:03,584 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:03,584 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,588 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:03,588 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:03,634 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:03,634 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,638 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:03,639 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:03,684 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:03,684 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,688 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:03,688 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:03,733 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:03,734 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:03,775 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:03,775 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,874 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:03,877 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:03,877 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:03,877 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:03,877 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:03,878 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:03,878 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,878 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:03,878 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:03,878 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration3_Loop [2020-10-20 06:33:03,878 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:03,878 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:03,879 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,883 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,886 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,888 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,894 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,905 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,965 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:03,966 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:03,971 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,973 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:03,973 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:03,973 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:03,973 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:03,973 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:03,974 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:03,974 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:03,976 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,008 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:04,010 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:04,010 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:04,011 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:04,011 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:04,011 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:04,012 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:04,012 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:04,014 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:04,065 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:04,068 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:04,068 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:04,068 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:04,068 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:04,068 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,071 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:04,071 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:04,073 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,103 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:04,105 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:04,105 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:04,105 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:04,105 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:04,105 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:04,110 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:04,110 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:04,113 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:04,119 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:33:04,119 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:04,127 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:04,127 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:04,127 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:04,127 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,157 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:04,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:04,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-20 06:33:04,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:04,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:04,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:04,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:04,269 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 3 loop predicates [2020-10-20 06:33:04,269 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 62 states and 98 transitions. cyclomatic complexity: 40 Second operand 4 states. [2020-10-20 06:33:04,325 INFO L75 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. [2020-10-20 06:33:04,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:04,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-10-20 06:33:04,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 13 transitions. [2020-10-20 06:33:04,328 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 8 letters. Loop has 3 letters. [2020-10-20 06:33:04,328 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:04,328 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 11 letters. Loop has 3 letters. [2020-10-20 06:33:04,329 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:04,329 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 8 letters. Loop has 6 letters. [2020-10-20 06:33:04,329 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:04,329 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 108 states and 165 transitions. [2020-10-20 06:33:04,334 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:04,339 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 108 states to 96 states and 153 transitions. [2020-10-20 06:33:04,339 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 40 [2020-10-20 06:33:04,340 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 42 [2020-10-20 06:33:04,340 INFO L73 IsDeterministic]: Start isDeterministic. Operand 96 states and 153 transitions. [2020-10-20 06:33:04,341 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:04,341 INFO L691 BuchiCegarLoop]: Abstraction has 96 states and 153 transitions. [2020-10-20 06:33:04,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states and 153 transitions. [2020-10-20 06:33:04,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2020-10-20 06:33:04,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-10-20 06:33:04,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 143 transitions. [2020-10-20 06:33:04,357 INFO L714 BuchiCegarLoop]: Abstraction has 92 states and 143 transitions. [2020-10-20 06:33:04,357 INFO L594 BuchiCegarLoop]: Abstraction has 92 states and 143 transitions. [2020-10-20 06:33:04,358 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-10-20 06:33:04,358 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 143 transitions. [2020-10-20 06:33:04,360 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:04,360 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:04,361 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:04,361 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:04,362 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-20 06:33:04,362 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 [2020-10-20 06:33:04,362 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 [2020-10-20 06:33:04,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:04,363 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2020-10-20 06:33:04,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:04,363 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690415583] [2020-10-20 06:33:04,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:04,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:04,371 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:04,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:04,377 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:04,379 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:04,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:04,380 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2020-10-20 06:33:04,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:04,380 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515757148] [2020-10-20 06:33:04,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:04,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:04,384 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:04,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:04,386 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:04,387 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:04,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:04,388 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2020-10-20 06:33:04,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:04,388 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705053327] [2020-10-20 06:33:04,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:04,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:04,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,437 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-20 06:33:04,437 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705053327] [2020-10-20 06:33:04,438 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 06:33:04,438 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-20 06:33:04,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910461598] [2020-10-20 06:33:04,472 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:04,473 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:04,473 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:04,473 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:04,473 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:04,473 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,473 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:04,473 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:04,473 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration4_Loop [2020-10-20 06:33:04,474 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:04,474 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:04,475 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,478 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,481 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,485 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,493 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,496 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,532 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:04,532 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:04,539 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:04,539 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,548 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:04,548 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:04,585 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:04,586 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,590 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:04,590 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:04,627 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:04,627 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,631 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:04,632 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:04,669 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:04,669 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:04,706 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:04,707 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,742 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:04,743 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:04,743 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:04,743 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:04,743 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:04,744 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:04,744 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,744 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:04,744 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:04,744 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration4_Loop [2020-10-20 06:33:04,744 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:04,744 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:04,748 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,750 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,753 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,758 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,761 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,763 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,801 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:04,801 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:04,809 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:04,810 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:04,810 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:04,811 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:04,811 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:04,811 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:04,811 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:04,812 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,813 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,840 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:04,841 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:04,841 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:04,841 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:04,841 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:04,841 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:04,851 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:04,851 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:04,853 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,878 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:04,880 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:04,880 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:04,880 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:04,880 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:04,880 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:04,881 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:04,881 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:04,883 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:04,885 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:33:04,885 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2020-10-20 06:33:04,890 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:04,890 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:04,891 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:04,891 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-10-20 06:33:04,911 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:04,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:04,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-10-20 06:33:04,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:04,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:04,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:05,002 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:05,003 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 143 transitions. cyclomatic complexity: 57 Second operand 5 states. [2020-10-20 06:33:05,110 INFO L75 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. [2020-10-20 06:33:05,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:05,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:05,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-10-20 06:33:05,120 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 13 letters. Loop has 3 letters. [2020-10-20 06:33:05,120 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:05,121 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 16 letters. Loop has 3 letters. [2020-10-20 06:33:05,121 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:05,121 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 13 letters. Loop has 6 letters. [2020-10-20 06:33:05,121 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:05,121 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 132 states and 207 transitions. [2020-10-20 06:33:05,124 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:05,128 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 132 states to 120 states and 195 transitions. [2020-10-20 06:33:05,129 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 49 [2020-10-20 06:33:05,129 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 51 [2020-10-20 06:33:05,129 INFO L73 IsDeterministic]: Start isDeterministic. Operand 120 states and 195 transitions. [2020-10-20 06:33:05,129 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:05,129 INFO L691 BuchiCegarLoop]: Abstraction has 120 states and 195 transitions. [2020-10-20 06:33:05,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states and 195 transitions. [2020-10-20 06:33:05,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 116. [2020-10-20 06:33:05,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-10-20 06:33:05,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 185 transitions. [2020-10-20 06:33:05,143 INFO L714 BuchiCegarLoop]: Abstraction has 116 states and 185 transitions. [2020-10-20 06:33:05,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:05,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-20 06:33:05,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-20 06:33:05,143 INFO L87 Difference]: Start difference. First operand 116 states and 185 transitions. Second operand 6 states. [2020-10-20 06:33:05,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:05,196 INFO L93 Difference]: Finished difference Result 129 states and 195 transitions. [2020-10-20 06:33:05,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-20 06:33:05,196 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 129 states and 195 transitions. [2020-10-20 06:33:05,200 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2020-10-20 06:33:05,204 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 129 states to 127 states and 193 transitions. [2020-10-20 06:33:05,205 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 59 [2020-10-20 06:33:05,205 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 59 [2020-10-20 06:33:05,205 INFO L73 IsDeterministic]: Start isDeterministic. Operand 127 states and 193 transitions. [2020-10-20 06:33:05,206 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:05,206 INFO L691 BuchiCegarLoop]: Abstraction has 127 states and 193 transitions. [2020-10-20 06:33:05,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states and 193 transitions. [2020-10-20 06:33:05,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 104. [2020-10-20 06:33:05,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-10-20 06:33:05,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 157 transitions. [2020-10-20 06:33:05,220 INFO L714 BuchiCegarLoop]: Abstraction has 104 states and 157 transitions. [2020-10-20 06:33:05,220 INFO L594 BuchiCegarLoop]: Abstraction has 104 states and 157 transitions. [2020-10-20 06:33:05,220 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-10-20 06:33:05,221 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 104 states and 157 transitions. [2020-10-20 06:33:05,223 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2020-10-20 06:33:05,223 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:05,223 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:05,224 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:05,224 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:05,224 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 [2020-10-20 06:33:05,225 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 [2020-10-20 06:33:05,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:05,225 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2020-10-20 06:33:05,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:05,226 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166706896] [2020-10-20 06:33:05,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:05,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:05,233 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:05,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:05,239 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:05,241 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:05,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:05,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2020-10-20 06:33:05,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:05,242 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984165613] [2020-10-20 06:33:05,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:05,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-20 06:33:05,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-20 06:33:05,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,300 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-20 06:33:05,300 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984165613] [2020-10-20 06:33:05,300 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582864359] [2020-10-20 06:33:05,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 06:33:05,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-10-20 06:33:05,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,331 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:05,331 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-10-20 06:33:05,331 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2020-10-20 06:33:05,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073170068] [2020-10-20 06:33:05,332 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-10-20 06:33:05,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:05,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-20 06:33:05,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-20 06:33:05,333 INFO L87 Difference]: Start difference. First operand 104 states and 157 transitions. cyclomatic complexity: 59 Second operand 6 states. [2020-10-20 06:33:05,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:05,386 INFO L93 Difference]: Finished difference Result 119 states and 173 transitions. [2020-10-20 06:33:05,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-20 06:33:05,388 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 119 states and 173 transitions. [2020-10-20 06:33:05,391 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:05,394 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 119 states to 114 states and 164 transitions. [2020-10-20 06:33:05,395 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 50 [2020-10-20 06:33:05,395 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2020-10-20 06:33:05,395 INFO L73 IsDeterministic]: Start isDeterministic. Operand 114 states and 164 transitions. [2020-10-20 06:33:05,395 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:05,396 INFO L691 BuchiCegarLoop]: Abstraction has 114 states and 164 transitions. [2020-10-20 06:33:05,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states and 164 transitions. [2020-10-20 06:33:05,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2020-10-20 06:33:05,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-10-20 06:33:05,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 161 transitions. [2020-10-20 06:33:05,409 INFO L714 BuchiCegarLoop]: Abstraction has 111 states and 161 transitions. [2020-10-20 06:33:05,409 INFO L594 BuchiCegarLoop]: Abstraction has 111 states and 161 transitions. [2020-10-20 06:33:05,409 INFO L427 BuchiCegarLoop]: ======== Iteration 6============ [2020-10-20 06:33:05,409 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 111 states and 161 transitions. [2020-10-20 06:33:05,419 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:05,420 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:05,424 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:05,426 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:05,426 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-20 06:33:05,426 INFO L794 eck$LassoCheckResult]: Stem: 1471#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1472#L25 call main_#t~ret6 := rec2(main_~x~0);< 1479#rec2ENTRY ~j := #in~j; 1501#L18 assume !(~j <= 0); 1481#L20 call #t~ret3 := rec1(~j);< 1494#rec1ENTRY ~i := #in~i; 1491#L12 assume !(~i <= 0); 1440#L14 call #t~ret0 := rec1(~i - 2);< 1488#rec1ENTRY ~i := #in~i; 1486#L12 assume !(~i <= 0); 1437#L14 call #t~ret0 := rec1(~i - 2);< 1485#rec1ENTRY ~i := #in~i; 1487#L12 assume ~i <= 0;#res := 0; 1505#rec1FINAL assume true; 1496#rec1EXIT >#27#return; 1448#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1449#rec1ENTRY ~i := #in~i; 1508#L12 assume ~i <= 0;#res := 0; 1507#rec1FINAL assume true; 1506#rec1EXIT >#29#return; 1428#L14-2 call #t~ret2 := rec1(#t~ret1);< 1427#rec1ENTRY ~i := #in~i; 1429#L12 assume ~i <= 0;#res := 0; 1465#rec1FINAL assume true; 1467#rec1EXIT >#31#return; 1460#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 1434#rec1FINAL assume true; 1444#rec1EXIT >#27#return; 1441#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1474#rec1ENTRY [2020-10-20 06:33:05,427 INFO L796 eck$LassoCheckResult]: Loop: 1474#rec1ENTRY ~i := #in~i; 1504#L12 assume !(~i <= 0); 1438#L14 call #t~ret0 := rec1(~i - 2);< 1474#rec1ENTRY [2020-10-20 06:33:05,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:05,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2020-10-20 06:33:05,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:05,428 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702488190] [2020-10-20 06:33:05,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:05,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:05,438 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:05,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:05,446 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:05,450 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:05,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:05,450 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2020-10-20 06:33:05,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:05,451 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381292073] [2020-10-20 06:33:05,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:05,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:05,453 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:05,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:05,455 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:05,456 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:05,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:05,457 INFO L82 PathProgramCache]: Analyzing trace with hash -2050992272, now seen corresponding path program 2 times [2020-10-20 06:33:05,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:05,457 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642705611] [2020-10-20 06:33:05,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:05,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:05,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:33:05,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:05,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-20 06:33:05,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,550 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-10-20 06:33:05,550 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642705611] [2020-10-20 06:33:05,550 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338765221] [2020-10-20 06:33:05,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2020-10-20 06:33:05,583 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-20 06:33:05,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 06:33:05,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:05,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,603 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-10-20 06:33:05,603 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 06:33:05,604 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-10-20 06:33:05,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864056036] [2020-10-20 06:33:05,631 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:05,631 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:05,631 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:05,631 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:05,631 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:05,631 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,631 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:05,631 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:05,632 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration6_Loop [2020-10-20 06:33:05,632 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:05,632 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:05,633 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,635 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,637 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,639 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,643 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,645 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,687 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:05,687 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,692 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:05,692 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:05,694 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:05,694 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:05,717 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:05,717 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,719 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:05,719 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2020-10-20 06:33:05,742 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:05,742 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:05,744 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:05,744 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:05,768 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:05,768 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,794 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:05,794 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:05,820 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:05,821 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:05,821 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:05,821 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:05,822 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:05,822 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:05,822 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,822 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:05,822 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:05,822 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration6_Loop [2020-10-20 06:33:05,822 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:05,822 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:05,824 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,825 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,827 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,833 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,835 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,838 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,867 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:05,867 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2020-10-20 06:33:05,872 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:05,873 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:05,873 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:05,873 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:05,873 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:05,873 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:05,874 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:05,874 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:05,875 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:05,898 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,900 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:05,900 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:05,900 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:05,900 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:05,901 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:05,901 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:05,901 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:05,903 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,926 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:05,927 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:05,927 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:05,928 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:05,928 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:05,928 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:05,929 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:05,929 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:05,931 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:05,932 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:33:05,932 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,935 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:05,936 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:05,936 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:05,936 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-10-20 06:33:05,956 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:05,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:06,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:06,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:06,043 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,050 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,079 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:06,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:06,119 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:06,119 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:06,119 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2020-10-20 06:33:06,192 INFO L75 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. [2020-10-20 06:33:06,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:06,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:06,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-10-20 06:33:06,194 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 3 letters. [2020-10-20 06:33:06,194 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:06,194 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:06,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:06,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:06,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:06,302 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,310 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,320 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:06,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:06,366 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:06,367 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:06,367 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2020-10-20 06:33:06,429 INFO L75 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. [2020-10-20 06:33:06,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:06,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:06,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-10-20 06:33:06,430 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 3 letters. [2020-10-20 06:33:06,430 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:06,430 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:06,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:06,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:06,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:06,495 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,499 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,503 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:06,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:06,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:06,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:06,531 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:06,532 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2020-10-20 06:33:06,638 INFO L75 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. [2020-10-20 06:33:06,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:06,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:06,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-10-20 06:33:06,640 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 3 letters. [2020-10-20 06:33:06,640 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:06,641 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-10-20 06:33:06,641 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:06,641 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 6 letters. [2020-10-20 06:33:06,641 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:06,642 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 156 states and 218 transitions. [2020-10-20 06:33:06,645 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 15 [2020-10-20 06:33:06,649 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 156 states to 138 states and 200 transitions. [2020-10-20 06:33:06,650 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 54 [2020-10-20 06:33:06,650 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 57 [2020-10-20 06:33:06,651 INFO L73 IsDeterministic]: Start isDeterministic. Operand 138 states and 200 transitions. [2020-10-20 06:33:06,651 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:06,651 INFO L691 BuchiCegarLoop]: Abstraction has 138 states and 200 transitions. [2020-10-20 06:33:06,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states and 200 transitions. [2020-10-20 06:33:06,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 119. [2020-10-20 06:33:06,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-10-20 06:33:06,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 169 transitions. [2020-10-20 06:33:06,666 INFO L714 BuchiCegarLoop]: Abstraction has 119 states and 169 transitions. [2020-10-20 06:33:06,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:06,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-20 06:33:06,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-10-20 06:33:06,667 INFO L87 Difference]: Start difference. First operand 119 states and 169 transitions. Second operand 8 states. [2020-10-20 06:33:06,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:06,723 INFO L93 Difference]: Finished difference Result 97 states and 115 transitions. [2020-10-20 06:33:06,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-20 06:33:06,724 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 97 states and 115 transitions. [2020-10-20 06:33:06,725 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2020-10-20 06:33:06,727 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 97 states to 62 states and 74 transitions. [2020-10-20 06:33:06,727 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 11 [2020-10-20 06:33:06,728 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 11 [2020-10-20 06:33:06,728 INFO L73 IsDeterministic]: Start isDeterministic. Operand 62 states and 74 transitions. [2020-10-20 06:33:06,728 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:06,728 INFO L691 BuchiCegarLoop]: Abstraction has 62 states and 74 transitions. [2020-10-20 06:33:06,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states and 74 transitions. [2020-10-20 06:33:06,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2020-10-20 06:33:06,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-10-20 06:33:06,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2020-10-20 06:33:06,733 INFO L714 BuchiCegarLoop]: Abstraction has 53 states and 64 transitions. [2020-10-20 06:33:06,733 INFO L594 BuchiCegarLoop]: Abstraction has 53 states and 64 transitions. [2020-10-20 06:33:06,733 INFO L427 BuchiCegarLoop]: ======== Iteration 7============ [2020-10-20 06:33:06,734 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 53 states and 64 transitions. [2020-10-20 06:33:06,734 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2020-10-20 06:33:06,734 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:06,735 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:06,736 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:06,736 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-20 06:33:06,736 INFO L794 eck$LassoCheckResult]: Stem: 2675#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 2650#L25 call main_#t~ret6 := rec2(main_~x~0);< 2649#rec2ENTRY ~j := #in~j; 2651#L18 assume !(~j <= 0); 2679#L20 call #t~ret3 := rec1(~j);< 2690#rec1ENTRY ~i := #in~i; 2691#L12 assume !(~i <= 0); 2669#L14 call #t~ret0 := rec1(~i - 2);< 2688#rec1ENTRY ~i := #in~i; 2698#L12 assume ~i <= 0;#res := 0; 2701#rec1FINAL assume true; 2687#rec1EXIT >#27#return; 2661#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 2660#rec1ENTRY ~i := #in~i; 2663#L12 assume ~i <= 0;#res := 0; 2664#rec1FINAL assume true; 2665#rec1EXIT >#29#return; 2684#L14-2 call #t~ret2 := rec1(#t~ret1);< 2673#rec1ENTRY ~i := #in~i; 2686#L12 assume ~i <= 0;#res := 0; 2685#rec1FINAL assume true; 2683#rec1EXIT >#31#return; 2682#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 2681#rec1FINAL assume true; 2680#rec1EXIT >#33#return; 2653#L20-1 call #t~ret4 := rec2(#t~ret3 - 1);< 2652#rec2ENTRY ~j := #in~j; 2655#L18 assume !(~j <= 0); 2659#L20 call #t~ret3 := rec1(~j);< 2656#rec1ENTRY [2020-10-20 06:33:06,736 INFO L796 eck$LassoCheckResult]: Loop: 2656#rec1ENTRY ~i := #in~i; 2658#L12 assume !(~i <= 0); 2657#L14 call #t~ret0 := rec1(~i - 2);< 2656#rec1ENTRY [2020-10-20 06:33:06,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:06,737 INFO L82 PathProgramCache]: Analyzing trace with hash -1852176490, now seen corresponding path program 2 times [2020-10-20 06:33:06,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:06,737 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387621004] [2020-10-20 06:33:06,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:06,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-10-20 06:33:06,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:33:06,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:06,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-20 06:33:06,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:06,849 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-10-20 06:33:06,850 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387621004] [2020-10-20 06:33:06,850 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057006028] [2020-10-20 06:33:06,850 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2020-10-20 06:33:06,880 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-20 06:33:06,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 06:33:06,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:06,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:06,894 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-10-20 06:33:06,894 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 06:33:06,895 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-10-20 06:33:06,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022821273] [2020-10-20 06:33:06,896 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-10-20 06:33:06,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:06,896 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 4 times [2020-10-20 06:33:06,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:06,896 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533150982] [2020-10-20 06:33:06,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:06,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:06,899 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:06,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:06,901 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:06,902 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:06,967 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:06,967 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:06,967 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:06,967 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:06,967 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:06,968 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:06,968 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:06,968 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:06,968 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration7_Loop [2020-10-20 06:33:06,968 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:06,968 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:06,970 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,973 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,974 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,976 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,979 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,992 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:07,020 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:07,021 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,024 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:07,024 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:07,027 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:07,027 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:07,050 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:07,050 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,053 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:07,053 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,075 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:07,075 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:07,077 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:07,077 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,101 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:07,101 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:07,105 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:07,105 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 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,129 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:07,130 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,154 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:07,154 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:07,216 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:07,217 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:07,218 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:07,218 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:07,218 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:07,218 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:07,218 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,218 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:07,218 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:07,218 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration7_Loop [2020-10-20 06:33:07,218 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:07,218 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:07,220 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:07,222 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:07,224 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:07,226 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:07,228 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:07,234 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:07,268 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:07,269 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:07,279 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,281 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:07,281 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:07,281 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:07,281 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:07,281 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:07,282 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:07,282 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:07,283 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,308 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:07,309 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:07,309 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:07,309 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:07,309 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:07,310 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:07,310 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:07,310 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:07,312 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,335 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:07,336 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:07,337 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:07,337 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:07,337 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:07,337 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:07,337 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:07,337 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:07,339 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,363 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:07,364 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:07,364 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:07,364 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:07,364 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:07,364 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:07,364 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:07,365 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:07,366 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,389 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:07,390 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:07,391 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:07,391 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:07,391 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:07,391 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:07,391 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:07,392 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:07,394 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:07,397 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:33:07,397 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:33:07,399 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:07,400 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:07,400 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:07,400 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-10-20 06:33:07,420 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:07,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:07,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:07,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:07,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:07,524 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,527 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,531 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:07,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:07,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:07,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:07,559 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:07,559 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2020-10-20 06:33:07,646 INFO L75 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. [2020-10-20 06:33:07,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:07,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:07,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 10 transitions. [2020-10-20 06:33:07,649 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 10 transitions. Stem has 29 letters. Loop has 3 letters. [2020-10-20 06:33:07,649 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:07,649 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:07,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:07,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:07,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:07,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:07,718 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,722 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,725 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:07,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:07,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:07,758 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:07,759 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:07,759 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2020-10-20 06:33:07,837 INFO L75 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. [2020-10-20 06:33:07,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:07,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:07,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 10 transitions. [2020-10-20 06:33:07,840 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 10 transitions. Stem has 29 letters. Loop has 3 letters. [2020-10-20 06:33:07,840 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:07,840 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:07,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:07,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:07,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:07,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:07,917 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,919 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,922 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:07,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:07,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:07,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:07,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:07,949 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:07,949 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2020-10-20 06:33:08,045 INFO L75 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. [2020-10-20 06:33:08,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:08,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:08,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-10-20 06:33:08,046 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 3 letters. [2020-10-20 06:33:08,047 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:08,047 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-10-20 06:33:08,047 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:08,047 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 6 letters. [2020-10-20 06:33:08,048 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:08,048 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 77 states and 89 transitions. [2020-10-20 06:33:08,055 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-10-20 06:33:08,055 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 77 states to 0 states and 0 transitions. [2020-10-20 06:33:08,055 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-10-20 06:33:08,056 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-10-20 06:33:08,056 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-10-20 06:33:08,056 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-10-20 06:33:08,056 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-20 06:33:08,056 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-20 06:33:08,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:08,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-20 06:33:08,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-10-20 06:33:08,057 INFO L87 Difference]: Start difference. First operand 0 states and 0 transitions. Second operand 8 states. [2020-10-20 06:33:08,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:08,058 INFO L93 Difference]: Finished difference Result 0 states and 0 transitions. [2020-10-20 06:33:08,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-20 06:33:08,058 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 0 states and 0 transitions. [2020-10-20 06:33:08,058 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-10-20 06:33:08,058 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 0 states to 0 states and 0 transitions. [2020-10-20 06:33:08,058 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-10-20 06:33:08,058 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-10-20 06:33:08,058 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-10-20 06:33:08,059 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-10-20 06:33:08,059 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-20 06:33:08,059 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-20 06:33:08,059 INFO L594 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-20 06:33:08,059 INFO L427 BuchiCegarLoop]: ======== Iteration 8============ [2020-10-20 06:33:08,059 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2020-10-20 06:33:08,059 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-10-20 06:33:08,059 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2020-10-20 06:33:08,066 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 20.10 06:33:08 BoogieIcfgContainer [2020-10-20 06:33:08,066 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-10-20 06:33:08,067 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 06:33:08,067 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 06:33:08,067 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 06:33:08,068 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:33:00" (3/4) ... [2020-10-20 06:33:08,072 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-10-20 06:33:08,072 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 06:33:08,074 INFO L168 Benchmark]: Toolchain (without parser) took 7969.53 ms. Allocated memory was 36.7 MB in the beginning and 77.1 MB in the end (delta: 40.4 MB). Free memory was 14.5 MB in the beginning and 54.6 MB in the end (delta: -40.1 MB). Peak memory consumption was 240.8 kB. Max. memory is 14.3 GB. [2020-10-20 06:33:08,074 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 34.1 MB. Free memory was 19.4 MB in the beginning and 19.4 MB in the end (delta: 31.3 kB). Peak memory consumption was 31.3 kB. Max. memory is 14.3 GB. [2020-10-20 06:33:08,075 INFO L168 Benchmark]: CACSL2BoogieTranslator took 298.43 ms. Allocated memory was 36.7 MB in the beginning and 44.6 MB in the end (delta: 7.9 MB). Free memory was 13.6 MB in the beginning and 26.5 MB in the end (delta: -12.9 MB). Peak memory consumption was 11.4 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:08,076 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.04 ms. Allocated memory is still 44.6 MB. Free memory was 26.3 MB in the beginning and 24.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:08,076 INFO L168 Benchmark]: Boogie Preprocessor took 16.83 ms. Allocated memory is still 44.6 MB. Free memory was 24.9 MB in the beginning and 23.8 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.1 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:08,077 INFO L168 Benchmark]: RCFGBuilder took 230.25 ms. Allocated memory was 44.6 MB in the beginning and 47.2 MB in the end (delta: 2.6 MB). Free memory was 23.8 MB in the beginning and 27.1 MB in the end (delta: -3.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:08,078 INFO L168 Benchmark]: BuchiAutomizer took 7369.58 ms. Allocated memory was 47.2 MB in the beginning and 77.1 MB in the end (delta: 29.9 MB). Free memory was 26.9 MB in the beginning and 54.6 MB in the end (delta: -27.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:08,078 INFO L168 Benchmark]: Witness Printer took 5.16 ms. Allocated memory is still 77.1 MB. Free memory is still 54.6 MB. There was no memory consumed. Max. memory is 14.3 GB. [2020-10-20 06:33:08,082 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 34.1 MB. Free memory was 19.4 MB in the beginning and 19.4 MB in the end (delta: 31.3 kB). Peak memory consumption was 31.3 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 298.43 ms. Allocated memory was 36.7 MB in the beginning and 44.6 MB in the end (delta: 7.9 MB). Free memory was 13.6 MB in the beginning and 26.5 MB in the end (delta: -12.9 MB). Peak memory consumption was 11.4 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 35.04 ms. Allocated memory is still 44.6 MB. Free memory was 26.3 MB in the beginning and 24.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 16.83 ms. Allocated memory is still 44.6 MB. Free memory was 24.9 MB in the beginning and 23.8 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.1 MB. Max. memory is 14.3 GB. * RCFGBuilder took 230.25 ms. Allocated memory was 44.6 MB in the beginning and 47.2 MB in the end (delta: 2.6 MB). Free memory was 23.8 MB in the beginning and 27.1 MB in the end (delta: -3.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 14.3 GB. * BuchiAutomizer took 7369.58 ms. Allocated memory was 47.2 MB in the beginning and 77.1 MB in the end (delta: 29.9 MB). Free memory was 26.9 MB in the beginning and 54.6 MB in the end (delta: -27.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 14.3 GB. * Witness Printer took 5.16 ms. Allocated memory is still 77.1 MB. Free memory is still 54.6 MB. There was no memory consumed. Max. memory is 14.3 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 7.3s and 8 iterations. TraceHistogramMax:5. Analysis of lassos took 4.1s. Construction of modules took 0.5s. Büchi inclusion checks took 2.3s. Highest rank in rank-based complementation 3. Minimization of det autom 3. Minimization of nondet autom 7. Automata minimization 0.1s 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, 0.5s Time LassoAnalysisResults: nont0 unkn0 SFLI2 SFLT2 conc0 concLT2 SILN0 SILU0 SILI0 SILT1 lasso0 LassoPreprocessingBenchmarks: Lassos: inital12 mio100 ax100 hnf91 lsp100 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq151 hnf93 smp100 dnf100 smp100 tf112 neg100 sie111 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 26ms VariablesStem: 0 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 0 MotzkinApplications: 2 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 18 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 5 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 0.6s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...