./Ultimate.py --spec ../sv-benchmarks/c/properties/termination.prp --file ../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for termination Using default analysis Version 906a4fb5 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -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_1b.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 cb528549fa76ae8087cf7043645dfa20323a0116 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.25-906a4fb [2020-10-19 18:39:56,712 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-19 18:39:56,715 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-19 18:39:56,740 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-19 18:39:56,741 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-19 18:39:56,742 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-19 18:39:56,744 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-19 18:39:56,746 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-19 18:39:56,748 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-19 18:39:56,749 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-19 18:39:56,750 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-19 18:39:56,751 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-19 18:39:56,752 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-19 18:39:56,753 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-19 18:39:56,754 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-19 18:39:56,755 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-19 18:39:56,756 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-19 18:39:56,758 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-19 18:39:56,759 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-19 18:39:56,761 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-19 18:39:56,763 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-19 18:39:56,764 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-19 18:39:56,766 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-19 18:39:56,767 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-19 18:39:56,770 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-19 18:39:56,770 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-19 18:39:56,770 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-19 18:39:56,771 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-19 18:39:56,772 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-19 18:39:56,773 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-19 18:39:56,773 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-19 18:39:56,774 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-19 18:39:56,775 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-19 18:39:56,776 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-19 18:39:56,777 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-19 18:39:56,777 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-19 18:39:56,778 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-19 18:39:56,778 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-19 18:39:56,779 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-19 18:39:56,780 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-19 18:39:56,781 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-19 18:39:56,781 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-10-19 18:39:56,807 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-19 18:39:56,808 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-19 18:39:56,809 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-19 18:39:56,809 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-19 18:39:56,810 INFO L138 SettingsManager]: * Use SBE=true [2020-10-19 18:39:56,810 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-10-19 18:39:56,810 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-10-19 18:39:56,811 INFO L138 SettingsManager]: * Use old map elimination=false [2020-10-19 18:39:56,811 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-10-19 18:39:56,811 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-10-19 18:39:56,811 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-10-19 18:39:56,812 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-19 18:39:56,812 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-10-19 18:39:56,812 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-19 18:39:56,813 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-19 18:39:56,813 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-10-19 18:39:56,813 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-10-19 18:39:56,813 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-10-19 18:39:56,814 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-19 18:39:56,814 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-10-19 18:39:56,814 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-19 18:39:56,814 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-10-19 18:39:56,815 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-19 18:39:56,815 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-19 18:39:56,815 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-10-19 18:39:56,816 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-19 18:39:56,816 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-19 18:39:56,816 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-19 18:39:56,816 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-10-19 18:39:56,817 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-10-19 18:39:56,818 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 -> cb528549fa76ae8087cf7043645dfa20323a0116 [2020-10-19 18:39:57,144 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-19 18:39:57,157 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-19 18:39:57,160 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-19 18:39:57,162 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-19 18:39:57,163 INFO L275 PluginConnector]: CDTParser initialized [2020-10-19 18:39:57,164 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-10-19 18:39:57,228 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98a66c4db/d9fb3dd83cd24d58930e2d271f31f9c4/FLAG685665196 [2020-10-19 18:39:57,621 INFO L306 CDTParser]: Found 1 translation units. [2020-10-19 18:39:57,622 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-10-19 18:39:57,629 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98a66c4db/d9fb3dd83cd24d58930e2d271f31f9c4/FLAG685665196 [2020-10-19 18:39:57,983 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/98a66c4db/d9fb3dd83cd24d58930e2d271f31f9c4 [2020-10-19 18:39:57,988 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-19 18:39:57,995 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-19 18:39:57,997 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-19 18:39:57,997 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-19 18:39:58,001 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-19 18:39:58,002 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.10 06:39:57" (1/1) ... [2020-10-19 18:39:58,006 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44c05edb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58, skipping insertion in model container [2020-10-19 18:39:58,006 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.10 06:39:57" (1/1) ... [2020-10-19 18:39:58,014 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-19 18:39:58,036 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-19 18:39:58,196 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-19 18:39:58,200 INFO L203 MainTranslator]: Completed pre-run [2020-10-19 18:39:58,216 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-19 18:39:58,231 INFO L208 MainTranslator]: Completed translation [2020-10-19 18:39:58,231 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58 WrapperNode [2020-10-19 18:39:58,231 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-19 18:39:58,232 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-19 18:39:58,232 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-19 18:39:58,233 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-19 18:39:58,240 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,244 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,261 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-19 18:39:58,262 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-19 18:39:58,262 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-19 18:39:58,262 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-19 18:39:58,328 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,329 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,329 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,329 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,333 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,339 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,340 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (1/1) ... [2020-10-19 18:39:58,341 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-19 18:39:58,343 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-19 18:39:58,343 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-19 18:39:58,343 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-19 18:39:58,345 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (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 [2020-10-19 18:39:58,402 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-10-19 18:39:58,402 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-10-19 18:39:58,402 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-10-19 18:39:58,403 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-10-19 18:39:58,403 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-19 18:39:58,403 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-19 18:39:58,584 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-19 18:39:58,585 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-10-19 18:39:58,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.10 06:39:58 BoogieIcfgContainer [2020-10-19 18:39:58,587 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-19 18:39:58,588 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-10-19 18:39:58,588 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-10-19 18:39:58,592 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-10-19 18:39:58,593 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-19 18:39:58,593 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 19.10 06:39:57" (1/3) ... [2020-10-19 18:39:58,595 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@6555801e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 19.10 06:39:58, skipping insertion in model container [2020-10-19 18:39:58,595 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-19 18:39:58,595 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.10 06:39:58" (2/3) ... [2020-10-19 18:39:58,596 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@6555801e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 19.10 06:39:58, skipping insertion in model container [2020-10-19 18:39:58,596 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-19 18:39:58,596 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.10 06:39:58" (3/3) ... [2020-10-19 18:39:58,598 INFO L373 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1b.c [2020-10-19 18:39:58,667 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-10-19 18:39:58,669 INFO L360 BuchiCegarLoop]: Hoare is false [2020-10-19 18:39:58,672 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-10-19 18:39:58,673 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-19 18:39:58,673 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-19 18:39:58,673 INFO L364 BuchiCegarLoop]: Difference is false [2020-10-19 18:39:58,673 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-19 18:39:58,674 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-10-19 18:39:58,699 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-10-19 18:39:58,762 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:39:58,762 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:39:58,762 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:39:58,770 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-19 18:39:58,770 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:39:58,771 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-10-19 18:39:58,771 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-10-19 18:39:58,774 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:39:58,774 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:39:58,774 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:39:58,775 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-19 18:39:58,775 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:39:58,782 INFO L794 eck$LassoCheckResult]: Stem: 13#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 22#L25true call main_#t~ret6 := rec2(main_~x~0);< 3#rec2ENTRYtrue [2020-10-19 18:39:58,782 INFO L796 eck$LassoCheckResult]: Loop: 3#rec2ENTRYtrue ~j := #in~j; 20#L18true assume !(~j <= 0); 18#L20true call #t~ret3 := rec1(~j - 1);< 4#rec1ENTRYtrue ~i := #in~i; 9#L12true assume ~i <= 0;#res := 0; 5#rec1FINALtrue assume true; 12#rec1EXITtrue >#33#return; 23#L20-1true call #t~ret4 := rec2(#t~ret3);< 3#rec2ENTRYtrue [2020-10-19 18:39:58,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:58,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2020-10-19 18:39:58,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:39:58,799 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027938181] [2020-10-19 18:39:58,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:39:58,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:58,864 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:58,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:58,868 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:58,883 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:39:58,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:58,885 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2020-10-19 18:39:58,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:39:58,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244052044] [2020-10-19 18:39:58,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:39:58,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:58,902 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:58,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:58,908 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:58,911 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:39:58,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:58,913 INFO L82 PathProgramCache]: Analyzing trace with hash -1371489668, now seen corresponding path program 1 times [2020-10-19 18:39:58,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:39:58,913 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581023212] [2020-10-19 18:39:58,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:39:58,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:58,923 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:58,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:39:58,930 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:39:58,933 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:39:59,129 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:39:59,130 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:39:59,130 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:39:59,130 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:39:59,130 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-19 18:39:59,130 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:39:59,131 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:39:59,131 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:39:59,131 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-10-19 18:39:59,131 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:39:59,131 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:39:59,153 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,165 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,169 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,174 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,181 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,241 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:39:59,242 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 [2020-10-19 18:39:59,255 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:39:59,255 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:39:59,265 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:39:59,266 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 [2020-10-19 18:39:59,315 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:39:59,316 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:39:59,321 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:39:59,321 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) [2020-10-19 18:39:59,369 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:39:59,369 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:39:59,378 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:39:59,378 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) [2020-10-19 18:39:59,425 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:39:59,426 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:39:59,433 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:39:59,433 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 [2020-10-19 18:39:59,477 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:39:59,478 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) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:39:59,505 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-19 18:39:59,505 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:39:59,512 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-19 18:39:59,543 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:39:59,544 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:39:59,544 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:39:59,544 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:39:59,545 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-19 18:39:59,545 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:39:59,545 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:39:59,545 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:39:59,545 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-10-19 18:39:59,546 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:39:59,546 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:39:59,547 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,552 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,555 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,559 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,568 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:39:59,609 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:39:59,615 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) [2020-10-19 18:39:59,629 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 [2020-10-19 18:39:59,632 INFO L338 nArgumentSynthesizer]: Template has degree 0. Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:39:59,632 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:39:59,633 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:39:59,633 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:39:59,634 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:39:59,636 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:39:59,637 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:39:59,640 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) [2020-10-19 18:39:59,687 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 [2020-10-19 18:39:59,690 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:39:59,690 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:39:59,690 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:39:59,690 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:39:59,691 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:39:59,692 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:39:59,692 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 [2020-10-19 18:39:59,695 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 [2020-10-19 18:39:59,733 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 [2020-10-19 18:39:59,736 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:39:59,736 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:39:59,736 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:39:59,736 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:39:59,736 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:39:59,737 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:39:59,737 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:39:59,741 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 [2020-10-19 18:39:59,765 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 [2020-10-19 18:39:59,767 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:39:59,767 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:39:59,768 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:39:59,768 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:39:59,768 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:39:59,769 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:39:59,770 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:39:59,779 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-19 18:39:59,793 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-10-19 18:39:59,793 INFO L444 ModelExtractionUtils]: 0 out of 3 variables were initially zero. Simplification set additionally 1 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 [2020-10-19 18:39:59,812 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-19 18:39:59,812 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-19 18:39:59,813 INFO L510 LassoAnalysis]: Proved termination. [2020-10-19 18:39:59,814 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#in~j) = 1*rec2_#in~j Supporting invariants [] [2020-10-19 18:39:59,838 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-19 18:39:59,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:39:59,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:39:59,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-10-19 18:39:59,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:39:59,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:39:59,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2020-10-19 18:39:59,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:00,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:40:00,106 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 6 loop predicates [2020-10-19 18:40:00,108 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 21 states. Second operand 7 states. [2020-10-19 18:40:00,744 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 21 states.. Second operand 7 states. Result 194 states and 279 transitions. Complement of second has 61 states. [2020-10-19 18:40:00,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 11 states 1 stem states 9 non-accepting loop states 1 accepting loop states [2020-10-19 18:40:00,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-10-19 18:40:00,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 57 transitions. [2020-10-19 18:40:00,759 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 8 letters. [2020-10-19 18:40:00,766 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:00,767 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 10 letters. Loop has 8 letters. [2020-10-19 18:40:00,768 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:00,769 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 16 letters. [2020-10-19 18:40:00,769 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:00,771 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 194 states and 279 transitions. [2020-10-19 18:40:00,803 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:40:00,824 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 194 states to 82 states and 120 transitions. [2020-10-19 18:40:00,826 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 35 [2020-10-19 18:40:00,827 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 38 [2020-10-19 18:40:00,829 INFO L73 IsDeterministic]: Start isDeterministic. Operand 82 states and 120 transitions. [2020-10-19 18:40:00,830 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:00,830 INFO L691 BuchiCegarLoop]: Abstraction has 82 states and 120 transitions. [2020-10-19 18:40:00,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states and 120 transitions. [2020-10-19 18:40:00,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-10-19 18:40:00,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-10-19 18:40:00,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 83 transitions. [2020-10-19 18:40:00,895 INFO L714 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-10-19 18:40:00,895 INFO L594 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-10-19 18:40:00,896 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-10-19 18:40:00,896 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 55 states and 83 transitions. [2020-10-19 18:40:00,901 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:40:00,902 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:40:00,902 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:40:00,903 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:00,903 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-19 18:40:00,903 INFO L794 eck$LassoCheckResult]: Stem: 378#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 345#L25 call main_#t~ret6 := rec2(main_~x~0);< 344#rec2ENTRY ~j := #in~j; 347#L18 assume !(~j <= 0); 363#L20 call #t~ret3 := rec1(~j - 1);< 379#rec1ENTRY ~i := #in~i; 397#L12 assume !(~i <= 0); 351#L14 call #t~ret0 := rec1(~i - 2);< 350#rec1ENTRY [2020-10-19 18:40:00,904 INFO L796 eck$LassoCheckResult]: Loop: 350#rec1ENTRY ~i := #in~i; 358#L12 assume !(~i <= 0); 354#L14 call #t~ret0 := rec1(~i - 2);< 350#rec1ENTRY [2020-10-19 18:40:00,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:00,908 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2020-10-19 18:40:00,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:00,912 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225982465] [2020-10-19 18:40:00,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:00,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:00,935 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:00,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:00,940 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:00,942 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:00,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:00,943 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2020-10-19 18:40:00,943 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:00,944 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445418755] [2020-10-19 18:40:00,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:00,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:00,948 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:00,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:00,950 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:00,951 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:00,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:00,952 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2020-10-19 18:40:00,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:00,953 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388188893] [2020-10-19 18:40:00,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:00,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:00,960 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:00,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:00,968 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:00,970 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:01,003 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:01,003 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:01,003 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:01,004 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:01,004 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-19 18:40:01,004 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,004 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:01,004 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:01,004 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-10-19 18:40:01,004 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:01,005 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:01,006 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,014 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,016 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,019 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,022 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,025 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,063 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:01,064 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) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,069 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:01,069 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:01,074 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:01,074 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,110 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:01,111 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:01,114 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:01,114 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,141 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:01,141 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:01,145 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:01,145 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,169 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:01,169 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:01,172 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:01,172 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,195 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:01,195 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:01,198 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:01,198 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:01,235 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:01,235 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /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) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,262 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-19 18:40:01,262 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:01,305 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-19 18:40:01,307 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:01,307 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:01,307 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:01,307 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:01,308 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-19 18:40:01,308 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,308 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:01,308 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:01,308 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-10-19 18:40:01,308 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:01,308 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:01,310 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,312 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,315 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,317 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,319 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,325 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,357 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:01,357 INFO L489 LassoAnalysis]: Using template 'affine'. 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) [2020-10-19 18:40:01,366 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,368 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:01,368 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:01,368 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:01,369 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:01,369 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:01,370 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:01,370 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:01,371 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) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,399 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 [2020-10-19 18:40:01,401 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:01,401 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:01,401 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:01,401 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:01,402 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:01,402 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:01,403 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:01,404 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 [2020-10-19 18:40:01,428 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 [2020-10-19 18:40:01,430 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:01,430 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:01,430 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:01,430 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:01,431 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:01,432 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:01,432 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:01,436 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:01,473 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 [2020-10-19 18:40:01,474 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:01,475 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:01,475 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:01,475 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:01,475 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,476 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:01,476 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:01,478 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,501 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 [2020-10-19 18:40:01,503 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:01,503 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:01,504 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:01,504 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:01,504 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:01,505 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:01,505 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:01,513 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-19 18:40:01,516 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-19 18:40:01,517 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:01,568 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-19 18:40:01,569 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-19 18:40:01,569 INFO L510 LassoAnalysis]: Proved termination. Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,569 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-10-19 18:40:01,605 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-19 18:40:01,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:01,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:01,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-19 18:40:01,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:01,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:01,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-19 18:40:01,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:01,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:40:01,714 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 [2020-10-19 18:40:01,714 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 55 states and 83 transitions. cyclomatic complexity: 32 Second operand 4 states. [2020-10-19 18:40:01,783 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 55 states and 83 transitions. cyclomatic complexity: 32. Second operand 4 states. Result 105 states and 149 transitions. Complement of second has 13 states. [2020-10-19 18:40:01,786 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 [2020-10-19 18:40:01,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-10-19 18:40:01,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 17 transitions. [2020-10-19 18:40:01,788 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 3 letters. [2020-10-19 18:40:01,789 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:01,789 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 11 letters. Loop has 3 letters. [2020-10-19 18:40:01,789 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:01,789 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 6 letters. [2020-10-19 18:40:01,790 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:01,790 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 105 states and 149 transitions. [2020-10-19 18:40:01,794 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:40:01,801 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 105 states to 93 states and 137 transitions. [2020-10-19 18:40:01,801 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 37 [2020-10-19 18:40:01,802 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 39 [2020-10-19 18:40:01,802 INFO L73 IsDeterministic]: Start isDeterministic. Operand 93 states and 137 transitions. [2020-10-19 18:40:01,804 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:01,804 INFO L691 BuchiCegarLoop]: Abstraction has 93 states and 137 transitions. [2020-10-19 18:40:01,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states and 137 transitions. [2020-10-19 18:40:01,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2020-10-19 18:40:01,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-10-19 18:40:01,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 129 transitions. [2020-10-19 18:40:01,821 INFO L714 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-10-19 18:40:01,821 INFO L594 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-10-19 18:40:01,822 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-10-19 18:40:01,822 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 89 states and 129 transitions. [2020-10-19 18:40:01,823 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:40:01,823 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:40:01,824 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:40:01,824 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:01,824 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-19 18:40:01,825 INFO L794 eck$LassoCheckResult]: Stem: 613#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 614#L25 call main_#t~ret6 := rec2(main_~x~0);< 620#rec2ENTRY ~j := #in~j; 633#L18 assume !(~j <= 0); 615#L20 call #t~ret3 := rec1(~j - 1);< 642#rec1ENTRY ~i := #in~i; 637#L12 assume !(~i <= 0); 577#L14 call #t~ret0 := rec1(~i - 2);< 576#rec1ENTRY ~i := #in~i; 579#L12 assume ~i <= 0;#res := 0; 583#rec1FINAL assume true; 584#rec1EXIT >#27#return; 593#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 595#rec1ENTRY [2020-10-19 18:40:01,825 INFO L796 eck$LassoCheckResult]: Loop: 595#rec1ENTRY ~i := #in~i; 632#L12 assume !(~i <= 0); 589#L14 call #t~ret0 := rec1(~i - 2);< 595#rec1ENTRY [2020-10-19 18:40:01,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:01,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2020-10-19 18:40:01,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:01,826 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998022306] [2020-10-19 18:40:01,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:01,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:01,833 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:01,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:01,839 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:01,841 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:01,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:01,842 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2020-10-19 18:40:01,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:01,842 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123553995] [2020-10-19 18:40:01,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:01,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:01,845 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:01,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:01,849 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:01,850 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:01,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:01,850 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2020-10-19 18:40:01,851 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:01,851 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277112452] [2020-10-19 18:40:01,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:01,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:01,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-19 18:40:01,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:01,920 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-19 18:40:01,921 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277112452] [2020-10-19 18:40:01,921 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-19 18:40:01,921 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-19 18:40:01,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732520211] [2020-10-19 18:40:01,955 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:01,956 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:01,956 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:01,956 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:01,956 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-19 18:40:01,956 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:01,956 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:01,956 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:01,956 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-10-19 18:40:01,957 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:01,957 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:01,958 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,960 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,966 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,968 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,971 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:01,973 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:02,002 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:02,002 INFO L404 LassoAnalysis]: Checking for nontermination... 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) [2020-10-19 18:40:02,006 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:02,006 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 [2020-10-19 18:40:02,012 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:02,012 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:02,045 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:02,046 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) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:02,079 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-19 18:40:02,079 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:02,106 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-19 18:40:02,108 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:02,108 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:02,108 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:02,108 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:02,108 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-19 18:40:02,108 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:02,108 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:02,108 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:02,108 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-10-19 18:40:02,109 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:02,109 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:02,110 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:02,113 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:02,118 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:02,121 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:02,123 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:02,125 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:02,160 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:02,161 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) [2020-10-19 18:40:02,170 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 [2020-10-19 18:40:02,172 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:02,172 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:02,172 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:02,172 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:02,172 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:02,173 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:02,173 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 [2020-10-19 18:40:02,175 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) [2020-10-19 18:40:02,212 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 [2020-10-19 18:40:02,213 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:02,213 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:02,213 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:02,214 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:02,214 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:02,215 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:02,215 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:02,217 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-19 18:40:02,223 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-19 18:40:02,223 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:02,229 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-19 18:40:02,230 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-19 18:40:02,230 INFO L510 LassoAnalysis]: Proved termination. [2020-10-19 18:40:02,230 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:02,253 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-19 18:40:02,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:02,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-10-19 18:40:02,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:02,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-19 18:40:02,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:02,349 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:40:02,350 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 [2020-10-19 18:40:02,350 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 89 states and 129 transitions. cyclomatic complexity: 47 Second operand 5 states. [2020-10-19 18:40:02,464 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 89 states and 129 transitions. cyclomatic complexity: 47. Second operand 5 states. Result 134 states and 193 transitions. Complement of second has 14 states. [2020-10-19 18:40:02,466 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 [2020-10-19 18:40:02,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-19 18:40:02,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 19 transitions. [2020-10-19 18:40:02,467 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 3 letters. [2020-10-19 18:40:02,468 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:02,468 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 16 letters. Loop has 3 letters. [2020-10-19 18:40:02,468 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:02,469 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 6 letters. [2020-10-19 18:40:02,469 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:02,469 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 134 states and 193 transitions. [2020-10-19 18:40:02,473 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:40:02,478 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 134 states to 122 states and 181 transitions. [2020-10-19 18:40:02,479 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 48 [2020-10-19 18:40:02,479 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2020-10-19 18:40:02,480 INFO L73 IsDeterministic]: Start isDeterministic. Operand 122 states and 181 transitions. [2020-10-19 18:40:02,480 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:02,480 INFO L691 BuchiCegarLoop]: Abstraction has 122 states and 181 transitions. [2020-10-19 18:40:02,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states and 181 transitions. [2020-10-19 18:40:02,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 113. [2020-10-19 18:40:02,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-10-19 18:40:02,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 165 transitions. [2020-10-19 18:40:02,494 INFO L714 BuchiCegarLoop]: Abstraction has 113 states and 165 transitions. [2020-10-19 18:40:02,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-19 18:40:02,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-19 18:40:02,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-19 18:40:02,498 INFO L87 Difference]: Start difference. First operand 113 states and 165 transitions. Second operand 6 states. [2020-10-19 18:40:02,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-19 18:40:02,578 INFO L93 Difference]: Finished difference Result 123 states and 175 transitions. [2020-10-19 18:40:02,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-19 18:40:02,580 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 123 states and 175 transitions. [2020-10-19 18:40:02,584 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2020-10-19 18:40:02,588 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 123 states to 121 states and 173 transitions. [2020-10-19 18:40:02,588 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 55 [2020-10-19 18:40:02,589 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 55 [2020-10-19 18:40:02,589 INFO L73 IsDeterministic]: Start isDeterministic. Operand 121 states and 173 transitions. [2020-10-19 18:40:02,589 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:02,589 INFO L691 BuchiCegarLoop]: Abstraction has 121 states and 173 transitions. [2020-10-19 18:40:02,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states and 173 transitions. [2020-10-19 18:40:02,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 101. [2020-10-19 18:40:02,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-10-19 18:40:02,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 143 transitions. [2020-10-19 18:40:02,601 INFO L714 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-10-19 18:40:02,601 INFO L594 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-10-19 18:40:02,601 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-10-19 18:40:02,601 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 101 states and 143 transitions. [2020-10-19 18:40:02,603 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2020-10-19 18:40:02,603 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:40:02,603 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:40:02,604 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:02,604 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:02,604 INFO L794 eck$LassoCheckResult]: Stem: 1167#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1168#L25 call main_#t~ret6 := rec2(main_~x~0);< 1174#rec2ENTRY ~j := #in~j; 1185#L18 assume !(~j <= 0); 1146#L20 call #t~ret3 := rec1(~j - 1);< 1184#rec1ENTRY ~i := #in~i; 1183#L12 assume !(~i <= 0); 1156#L14 call #t~ret0 := rec1(~i - 2);< 1181#rec1ENTRY ~i := #in~i; 1179#L12 assume !(~i <= 0); 1161#L14 call #t~ret0 := rec1(~i - 2);< 1178#rec1ENTRY ~i := #in~i; 1180#L12 assume ~i <= 0;#res := 0; 1222#rec1FINAL assume true; 1166#rec1EXIT >#27#return; 1133#L14-1 [2020-10-19 18:40:02,604 INFO L796 eck$LassoCheckResult]: Loop: 1133#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1132#rec1ENTRY ~i := #in~i; 1135#L12 assume ~i <= 0;#res := 0; 1140#rec1FINAL assume true; 1141#rec1EXIT >#29#return; 1154#L14-2 call #t~ret2 := rec1(#t~ret1);< 1163#rec1ENTRY ~i := #in~i; 1204#L12 assume !(~i <= 0); 1157#L14 call #t~ret0 := rec1(~i - 2);< 1163#rec1ENTRY ~i := #in~i; 1204#L12 assume ~i <= 0;#res := 0; 1205#rec1FINAL assume true; 1213#rec1EXIT >#27#return; 1133#L14-1 [2020-10-19 18:40:02,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:02,605 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2020-10-19 18:40:02,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:02,605 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495849169] [2020-10-19 18:40:02,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:02,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:02,613 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:02,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:02,619 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:02,621 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:02,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:02,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2020-10-19 18:40:02,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:02,622 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561673092] [2020-10-19 18:40:02,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:02,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-19 18:40:02,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-19 18:40:02,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,667 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-19 18:40:02,667 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561673092] [2020-10-19 18:40:02,667 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358540988] [2020-10-19 18:40:02,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-19 18:40:02,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-10-19 18:40:02,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:02,711 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:40:02,711 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-10-19 18:40:02,712 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2020-10-19 18:40:02,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554615545] [2020-10-19 18:40:02,712 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-10-19 18:40:02,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-19 18:40:02,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-19 18:40:02,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-19 18:40:02,713 INFO L87 Difference]: Start difference. First operand 101 states and 143 transitions. cyclomatic complexity: 49 Second operand 6 states. [2020-10-19 18:40:02,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-19 18:40:02,774 INFO L93 Difference]: Finished difference Result 117 states and 161 transitions. [2020-10-19 18:40:02,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-19 18:40:02,775 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 117 states and 161 transitions. [2020-10-19 18:40:02,779 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:40:02,782 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 117 states to 117 states and 161 transitions. [2020-10-19 18:40:02,782 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 53 [2020-10-19 18:40:02,783 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 53 [2020-10-19 18:40:02,783 INFO L73 IsDeterministic]: Start isDeterministic. Operand 117 states and 161 transitions. [2020-10-19 18:40:02,783 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:02,783 INFO L691 BuchiCegarLoop]: Abstraction has 117 states and 161 transitions. [2020-10-19 18:40:02,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states and 161 transitions. [2020-10-19 18:40:02,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2020-10-19 18:40:02,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-10-19 18:40:02,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 157 transitions. [2020-10-19 18:40:02,794 INFO L714 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-10-19 18:40:02,794 INFO L594 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-10-19 18:40:02,794 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-10-19 18:40:02,795 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 113 states and 157 transitions. [2020-10-19 18:40:02,796 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-19 18:40:02,796 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:40:02,796 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:40:02,798 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:02,798 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:02,798 INFO L794 eck$LassoCheckResult]: Stem: 1445#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1446#L25 call main_#t~ret6 := rec2(main_~x~0);< 1458#rec2ENTRY ~j := #in~j; 1471#L18 assume !(~j <= 0); 1422#L20 call #t~ret3 := rec1(~j - 1);< 1470#rec1ENTRY ~i := #in~i; 1469#L12 assume !(~i <= 0); 1418#L14 call #t~ret0 := rec1(~i - 2);< 1467#rec1ENTRY ~i := #in~i; 1440#L12 assume ~i <= 0;#res := 0; 1417#rec1FINAL assume true; 1419#rec1EXIT >#27#return; 1410#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1441#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1434#L14-3 #res := 1 + #t~ret2;havoc #t~ret1;havoc #t~ret0;havoc #t~ret2; 1435#rec1FINAL assume true; 1464#rec1EXIT >#33#return; 1404#L20-1 [2020-10-19 18:40:02,798 INFO L796 eck$LassoCheckResult]: Loop: 1404#L20-1 call #t~ret4 := rec2(#t~ret3);< 1403#rec2ENTRY ~j := #in~j; 1405#L18 assume !(~j <= 0); 1452#L20 call #t~ret3 := rec1(~j - 1);< 1454#rec1ENTRY ~i := #in~i; 1512#L12 assume !(~i <= 0); 1447#L14 call #t~ret0 := rec1(~i - 2);< 1454#rec1ENTRY ~i := #in~i; 1512#L12 assume ~i <= 0;#res := 0; 1511#rec1FINAL assume true; 1507#rec1EXIT >#27#return; 1411#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1506#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1463#L14-3 #res := 1 + #t~ret2;havoc #t~ret1;havoc #t~ret0;havoc #t~ret2; 1475#rec1FINAL assume true; 1461#rec1EXIT >#33#return; 1404#L20-1 [2020-10-19 18:40:02,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:02,799 INFO L82 PathProgramCache]: Analyzing trace with hash -790062692, now seen corresponding path program 1 times [2020-10-19 18:40:02,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:02,799 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839092547] [2020-10-19 18:40:02,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:02,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:02,813 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:02,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:02,822 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:02,825 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:02,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:02,826 INFO L82 PathProgramCache]: Analyzing trace with hash 125202860, now seen corresponding path program 1 times [2020-10-19 18:40:02,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:02,826 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248952830] [2020-10-19 18:40:02,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:02,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:02,835 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:02,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:02,843 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:02,846 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:02,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:02,846 INFO L82 PathProgramCache]: Analyzing trace with hash -2019382713, now seen corresponding path program 1 times [2020-10-19 18:40:02,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:02,847 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190861161] [2020-10-19 18:40:02,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:02,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-10-19 18:40:02,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-19 18:40:02,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-19 18:40:02,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-19 18:40:02,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-10-19 18:40:02,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:02,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-19 18:40:02,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:03,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-19 18:40:03,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:03,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-19 18:40:03,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:03,012 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-10-19 18:40:03,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190861161] [2020-10-19 18:40:03,013 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251535357] [2020-10-19 18:40:03,013 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 [2020-10-19 18:40:03,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:03,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2020-10-19 18:40:03,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:03,094 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-10-19 18:40:03,095 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-19 18:40:03,095 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-10-19 18:40:03,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942678709] [2020-10-19 18:40:03,387 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:03,388 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:03,388 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:03,388 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:03,388 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-19 18:40:03,388 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:03,389 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:03,389 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:03,389 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-10-19 18:40:03,389 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:03,389 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:03,391 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:03,405 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:03,410 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:03,459 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:03,460 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:03,462 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:03,463 INFO L160 nArgumentSynthesizer]: Using integer mode. 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 [2020-10-19 18:40:03,491 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-19 18:40:03,491 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:05,155 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-19 18:40:05,158 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:05,158 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:05,158 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:05,158 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:05,158 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-19 18:40:05,159 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:05,159 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:05,159 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:05,159 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-10-19 18:40:05,159 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:05,159 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:05,160 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:05,162 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:05,164 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:05,212 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:05,212 INFO L489 LassoAnalysis]: Using template 'affine'. 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) [2020-10-19 18:40:05,223 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 [2020-10-19 18:40:05,224 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:05,224 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:05,224 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:05,224 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:05,225 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:05,225 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:05,225 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:05,231 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 37 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:05,264 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 [2020-10-19 18:40:05,265 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:05,265 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:05,266 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:05,266 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:05,266 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:05,266 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:05,267 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:05,268 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:05,291 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 [2020-10-19 18:40:05,292 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:05,292 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:05,292 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:05,293 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:05,293 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:05,295 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:05,295 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:05,298 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-19 18:40:05,301 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-10-19 18:40:05,301 INFO L444 ModelExtractionUtils]: 2 out of 5 variables were initially zero. Simplification set additionally 1 variables to zero. 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 [2020-10-19 18:40:05,304 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-19 18:40:05,304 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-19 18:40:05,304 INFO L510 LassoAnalysis]: Proved termination. [2020-10-19 18:40:05,304 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#t~ret3) = 1*rec2_#t~ret3 Supporting invariants [] [2020-10-19 18:40:05,324 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-19 18:40:05,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:05,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:05,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 12 conjunts are in the unsatisfiable core [2020-10-19 18:40:05,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:05,406 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:05,412 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:05,416 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:05,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:05,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-19 18:40:05,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:05,633 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-19 18:40:05,634 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 9 loop predicates [2020-10-19 18:40:05,634 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 113 states and 157 transitions. cyclomatic complexity: 51 Second operand 11 states. [2020-10-19 18:40:06,123 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 113 states and 157 transitions. cyclomatic complexity: 51. Second operand 11 states. Result 584 states and 903 transitions. Complement of second has 45 states. [2020-10-19 18:40:06,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 11 states 2 stem states 8 non-accepting loop states 1 accepting loop states [2020-10-19 18:40:06,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-19 18:40:06,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 52 transitions. [2020-10-19 18:40:06,127 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 24 letters. [2020-10-19 18:40:06,128 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:06,128 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 49 letters. Loop has 24 letters. [2020-10-19 18:40:06,129 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:06,129 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 48 letters. [2020-10-19 18:40:06,130 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:06,130 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 584 states and 903 transitions. [2020-10-19 18:40:06,164 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-10-19 18:40:06,184 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 584 states to 432 states and 649 transitions. [2020-10-19 18:40:06,184 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 140 [2020-10-19 18:40:06,185 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 141 [2020-10-19 18:40:06,187 INFO L73 IsDeterministic]: Start isDeterministic. Operand 432 states and 649 transitions. [2020-10-19 18:40:06,187 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:06,187 INFO L691 BuchiCegarLoop]: Abstraction has 432 states and 649 transitions. [2020-10-19 18:40:06,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states and 649 transitions. [2020-10-19 18:40:06,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 383. [2020-10-19 18:40:06,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 383 states. [2020-10-19 18:40:06,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 534 transitions. [2020-10-19 18:40:06,250 INFO L714 BuchiCegarLoop]: Abstraction has 383 states and 534 transitions. [2020-10-19 18:40:06,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-19 18:40:06,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-19 18:40:06,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-10-19 18:40:06,252 INFO L87 Difference]: Start difference. First operand 383 states and 534 transitions. Second operand 11 states. [2020-10-19 18:40:06,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-19 18:40:06,488 INFO L93 Difference]: Finished difference Result 442 states and 645 transitions. [2020-10-19 18:40:06,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-19 18:40:06,489 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 442 states and 645 transitions. [2020-10-19 18:40:06,496 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-10-19 18:40:06,504 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 442 states to 349 states and 495 transitions. [2020-10-19 18:40:06,505 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 131 [2020-10-19 18:40:06,506 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 135 [2020-10-19 18:40:06,506 INFO L73 IsDeterministic]: Start isDeterministic. Operand 349 states and 495 transitions. [2020-10-19 18:40:06,516 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:06,516 INFO L691 BuchiCegarLoop]: Abstraction has 349 states and 495 transitions. [2020-10-19 18:40:06,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states and 495 transitions. [2020-10-19 18:40:06,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 314. [2020-10-19 18:40:06,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-10-19 18:40:06,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 415 transitions. [2020-10-19 18:40:06,555 INFO L714 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-10-19 18:40:06,555 INFO L594 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-10-19 18:40:06,555 INFO L427 BuchiCegarLoop]: ======== Iteration 6============ [2020-10-19 18:40:06,555 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 314 states and 415 transitions. [2020-10-19 18:40:06,558 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-10-19 18:40:06,559 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:40:06,559 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:40:06,561 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:06,561 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-19 18:40:06,562 INFO L794 eck$LassoCheckResult]: Stem: 3449#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 3450#L25 call main_#t~ret6 := rec2(main_~x~0);< 3467#rec2ENTRY ~j := #in~j; 3489#L18 assume !(~j <= 0); 3469#L20 call #t~ret3 := rec1(~j - 1);< 3487#rec1ENTRY ~i := #in~i; 3503#L12 assume !(~i <= 0); 3497#L14 call #t~ret0 := rec1(~i - 2);< 3502#rec1ENTRY ~i := #in~i; 3507#L12 assume ~i <= 0;#res := 0; 3561#rec1FINAL assume true; 3558#rec1EXIT >#27#return; 3553#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 3554#rec1ENTRY ~i := #in~i; 3557#L12 assume ~i <= 0;#res := 0; 3556#rec1FINAL assume true; 3552#rec1EXIT >#29#return; 3547#L14-2 call #t~ret2 := rec1(#t~ret1);< 3550#rec1ENTRY ~i := #in~i; 3555#L12 assume ~i <= 0;#res := 0; 3551#rec1FINAL assume true; 3549#rec1EXIT >#31#return; 3545#L14-3 #res := 1 + #t~ret2;havoc #t~ret1;havoc #t~ret0;havoc #t~ret2; 3582#rec1FINAL assume true; 3468#rec1EXIT >#33#return; 3388#L20-1 call #t~ret4 := rec2(#t~ret3);< 3387#rec2ENTRY ~j := #in~j; 3389#L18 assume !(~j <= 0); 3534#L20 call #t~ret3 := rec1(~j - 1);< 3474#rec1ENTRY ~i := #in~i; 3580#L12 assume !(~i <= 0); 3418#L14 call #t~ret0 := rec1(~i - 2);< 3452#rec1ENTRY [2020-10-19 18:40:06,562 INFO L796 eck$LassoCheckResult]: Loop: 3452#rec1ENTRY ~i := #in~i; 3566#L12 assume !(~i <= 0); 3417#L14 call #t~ret0 := rec1(~i - 2);< 3452#rec1ENTRY [2020-10-19 18:40:06,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:06,564 INFO L82 PathProgramCache]: Analyzing trace with hash -744961728, now seen corresponding path program 2 times [2020-10-19 18:40:06,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:06,564 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665461372] [2020-10-19 18:40:06,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:06,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:06,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-10-19 18:40:06,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:06,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-19 18:40:06,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:06,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-19 18:40:06,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:06,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-19 18:40:06,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:06,670 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-10-19 18:40:06,670 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665461372] [2020-10-19 18:40:06,670 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176037643] [2020-10-19 18:40:06,670 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-19 18:40:06,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-19 18:40:06,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-19 18:40:06,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2020-10-19 18:40:06,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:06,727 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-10-19 18:40:06,730 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-19 18:40:06,730 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2020-10-19 18:40:06,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106150588] [2020-10-19 18:40:06,732 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-10-19 18:40:06,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:06,732 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2020-10-19 18:40:06,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:06,733 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367885399] [2020-10-19 18:40:06,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:06,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:06,737 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:06,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:06,739 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:06,740 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:06,772 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:06,772 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:06,773 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:06,773 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:06,773 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-19 18:40:06,773 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:06,773 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:06,773 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:06,773 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-10-19 18:40:06,774 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:06,774 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:06,775 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:06,777 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:06,783 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:06,785 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:06,788 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:06,790 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:06,829 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:06,829 INFO L404 LassoAnalysis]: Checking for nontermination... 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) [2020-10-19 18:40:06,838 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:06,838 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:06,845 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:06,846 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 42 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:06,894 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:06,894 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 42 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 43 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:06,938 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-19 18:40:06,938 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:07,031 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-19 18:40:07,032 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:07,032 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:07,032 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:07,032 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:07,032 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-19 18:40:07,033 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:07,033 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:07,033 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:07,033 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-10-19 18:40:07,033 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:07,033 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:07,034 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:07,036 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:07,044 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:07,046 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:07,048 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:07,051 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:07,076 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:07,077 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-19 18:40:07,084 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 [2020-10-19 18:40:07,085 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:07,086 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:07,086 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:07,086 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:07,086 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:07,087 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:07,087 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:07,089 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 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 [2020-10-19 18:40:07,116 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 [2020-10-19 18:40:07,117 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:07,117 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:07,117 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:07,117 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:07,118 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:07,118 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:07,118 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:07,120 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-19 18:40:07,122 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-19 18:40:07,122 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 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:07,125 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-19 18:40:07,125 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-19 18:40:07,125 INFO L510 LassoAnalysis]: Proved termination. [2020-10-19 18:40:07,125 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-10-19 18:40:07,145 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-19 18:40:07,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:07,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:07,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-10-19 18:40:07,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:07,228 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,237 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,240 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:07,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-19 18:40:07,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:07,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:40:07,282 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 [2020-10-19 18:40:07,283 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-10-19 18:40:07,364 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114. Second operand 5 states. Result 348 states and 455 transitions. Complement of second has 14 states. [2020-10-19 18:40:07,367 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 [2020-10-19 18:40:07,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-19 18:40:07,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-10-19 18:40:07,368 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-10-19 18:40:07,368 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:07,368 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-19 18:40:07,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:07,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:07,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-10-19 18:40:07,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:07,450 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,454 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,456 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:07,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-19 18:40:07,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:07,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:40:07,493 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 [2020-10-19 18:40:07,493 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-10-19 18:40:07,571 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114. Second operand 5 states. Result 348 states and 455 transitions. Complement of second has 14 states. [2020-10-19 18:40:07,572 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 [2020-10-19 18:40:07,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-19 18:40:07,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-10-19 18:40:07,573 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-10-19 18:40:07,573 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:07,574 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-19 18:40:07,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:07,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:07,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-10-19 18:40:07,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:07,656 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,660 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,665 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:07,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:07,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-19 18:40:07,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:07,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:40:07,701 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 [2020-10-19 18:40:07,701 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-10-19 18:40:07,809 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114. Second operand 5 states. Result 485 states and 616 transitions. Complement of second has 16 states. [2020-10-19 18:40:07,810 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 [2020-10-19 18:40:07,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-19 18:40:07,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-10-19 18:40:07,811 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-10-19 18:40:07,811 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:07,812 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 35 letters. Loop has 3 letters. [2020-10-19 18:40:07,812 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:07,812 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 6 letters. [2020-10-19 18:40:07,814 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:07,814 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 485 states and 616 transitions. [2020-10-19 18:40:07,822 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 26 [2020-10-19 18:40:07,830 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 485 states to 395 states and 526 transitions. [2020-10-19 18:40:07,831 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 129 [2020-10-19 18:40:07,831 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 136 [2020-10-19 18:40:07,832 INFO L73 IsDeterministic]: Start isDeterministic. Operand 395 states and 526 transitions. [2020-10-19 18:40:07,832 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:07,832 INFO L691 BuchiCegarLoop]: Abstraction has 395 states and 526 transitions. [2020-10-19 18:40:07,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states and 526 transitions. [2020-10-19 18:40:07,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 351. [2020-10-19 18:40:07,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-10-19 18:40:07,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 456 transitions. [2020-10-19 18:40:07,849 INFO L714 BuchiCegarLoop]: Abstraction has 351 states and 456 transitions. [2020-10-19 18:40:07,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-19 18:40:07,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-19 18:40:07,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-10-19 18:40:07,851 INFO L87 Difference]: Start difference. First operand 351 states and 456 transitions. Second operand 10 states. [2020-10-19 18:40:07,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-19 18:40:07,967 INFO L93 Difference]: Finished difference Result 378 states and 513 transitions. [2020-10-19 18:40:07,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-19 18:40:07,968 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 378 states and 513 transitions. [2020-10-19 18:40:07,973 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-10-19 18:40:07,975 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 378 states to 104 states and 142 transitions. [2020-10-19 18:40:07,976 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 98 [2020-10-19 18:40:07,976 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 98 [2020-10-19 18:40:07,976 INFO L73 IsDeterministic]: Start isDeterministic. Operand 104 states and 142 transitions. [2020-10-19 18:40:07,977 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:07,977 INFO L691 BuchiCegarLoop]: Abstraction has 104 states and 142 transitions. [2020-10-19 18:40:07,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states and 142 transitions. [2020-10-19 18:40:07,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 86. [2020-10-19 18:40:07,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-10-19 18:40:07,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 106 transitions. [2020-10-19 18:40:07,984 INFO L714 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-10-19 18:40:07,985 INFO L594 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-10-19 18:40:07,985 INFO L427 BuchiCegarLoop]: ======== Iteration 7============ [2020-10-19 18:40:07,985 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 86 states and 106 transitions. [2020-10-19 18:40:07,986 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-10-19 18:40:07,986 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:40:07,986 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:40:07,987 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:07,988 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-19 18:40:07,988 INFO L794 eck$LassoCheckResult]: Stem: 6181#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 6182#L25 call main_#t~ret6 := rec2(main_~x~0);< 6187#rec2ENTRY ~j := #in~j; 6209#L18 assume !(~j <= 0); 6206#L20 call #t~ret3 := rec1(~j - 1);< 6208#rec1ENTRY ~i := #in~i; 6207#L12 assume !(~i <= 0); 6177#L14 call #t~ret0 := rec1(~i - 2);< 6189#rec1ENTRY ~i := #in~i; 6158#L12 assume !(~i <= 0); 6157#L14 [2020-10-19 18:40:07,988 INFO L796 eck$LassoCheckResult]: Loop: 6157#L14 call #t~ret0 := rec1(~i - 2);< 6156#rec1ENTRY ~i := #in~i; 6158#L12 assume !(~i <= 0); 6157#L14 [2020-10-19 18:40:07,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:07,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1371444593, now seen corresponding path program 3 times [2020-10-19 18:40:07,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:07,989 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711818106] [2020-10-19 18:40:07,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:08,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:08,001 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:08,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:08,005 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:08,009 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:08,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:08,010 INFO L82 PathProgramCache]: Analyzing trace with hash 54781, now seen corresponding path program 4 times [2020-10-19 18:40:08,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:08,011 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38270839] [2020-10-19 18:40:08,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:08,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:08,014 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:08,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:08,018 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:08,019 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:08,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:08,019 INFO L82 PathProgramCache]: Analyzing trace with hash 1318041775, now seen corresponding path program 4 times [2020-10-19 18:40:08,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:08,020 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761207411] [2020-10-19 18:40:08,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:08,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:08,026 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:08,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:08,033 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:08,043 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:08,073 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:08,073 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:08,073 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:08,073 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:08,074 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-19 18:40:08,074 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:08,074 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:08,074 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:08,074 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-10-19 18:40:08,074 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:08,074 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:08,075 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:08,082 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:08,085 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:08,087 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:08,090 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:08,124 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:08,125 INFO L404 LassoAnalysis]: Checking for nontermination... 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) [2020-10-19 18:40:08,128 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:08,128 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /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) [2020-10-19 18:40:08,170 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-19 18:40:08,170 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:11,689 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-19 18:40:11,691 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:11,691 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:11,691 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:11,691 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:11,692 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-19 18:40:11,692 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:11,692 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:11,692 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:11,692 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-10-19 18:40:11,692 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:11,692 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:11,693 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:11,699 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:11,702 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:11,704 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:11,707 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:11,740 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:11,741 INFO L489 LassoAnalysis]: Using template 'affine'. 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 [2020-10-19 18:40:11,743 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 [2020-10-19 18:40:11,745 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:11,745 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:11,745 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:11,745 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:11,745 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:11,746 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:11,746 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:11,748 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-19 18:40:11,750 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-19 18:40:11,750 INFO L444 ModelExtractionUtils]: 2 out of 4 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 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 [2020-10-19 18:40:11,753 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-19 18:40:11,753 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-19 18:40:11,753 INFO L510 LassoAnalysis]: Proved termination. [2020-10-19 18:40:11,754 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_~i) = 1*rec1_~i Supporting invariants [] [2020-10-19 18:40:11,773 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-19 18:40:11,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:11,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:11,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-19 18:40:11,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:11,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:11,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-19 18:40:11,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:11,838 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-19 18:40:11,838 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 [2020-10-19 18:40:11,838 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 86 states and 106 transitions. cyclomatic complexity: 23 Second operand 4 states. [2020-10-19 18:40:11,889 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 86 states and 106 transitions. cyclomatic complexity: 23. Second operand 4 states. Result 100 states and 124 transitions. Complement of second has 11 states. [2020-10-19 18:40:11,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 1 stem states 3 non-accepting loop states 1 accepting loop states [2020-10-19 18:40:11,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-10-19 18:40:11,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 13 transitions. [2020-10-19 18:40:11,894 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 3 letters. [2020-10-19 18:40:11,894 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:11,894 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 13 letters. Loop has 3 letters. [2020-10-19 18:40:11,894 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:11,894 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 6 letters. [2020-10-19 18:40:11,895 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:11,895 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 100 states and 124 transitions. [2020-10-19 18:40:11,897 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-10-19 18:40:11,899 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 100 states to 94 states and 117 transitions. [2020-10-19 18:40:11,899 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 83 [2020-10-19 18:40:11,899 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 84 [2020-10-19 18:40:11,899 INFO L73 IsDeterministic]: Start isDeterministic. Operand 94 states and 117 transitions. [2020-10-19 18:40:11,900 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:11,900 INFO L691 BuchiCegarLoop]: Abstraction has 94 states and 117 transitions. [2020-10-19 18:40:11,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states and 117 transitions. [2020-10-19 18:40:11,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2020-10-19 18:40:11,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-10-19 18:40:11,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 114 transitions. [2020-10-19 18:40:11,904 INFO L714 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-10-19 18:40:11,904 INFO L594 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-10-19 18:40:11,905 INFO L427 BuchiCegarLoop]: ======== Iteration 8============ [2020-10-19 18:40:11,905 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 114 transitions. [2020-10-19 18:40:11,906 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-10-19 18:40:11,906 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-19 18:40:11,906 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-19 18:40:11,907 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-19 18:40:11,908 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2020-10-19 18:40:11,908 INFO L794 eck$LassoCheckResult]: Stem: 6438#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 6407#L25 call main_#t~ret6 := rec2(main_~x~0);< 6406#rec2ENTRY ~j := #in~j; 6408#L18 assume !(~j <= 0); 6441#L20 call #t~ret3 := rec1(~j - 1);< 6442#rec1ENTRY ~i := #in~i; 6463#L12 assume !(~i <= 0); 6426#L14 call #t~ret0 := rec1(~i - 2);< 6460#rec1ENTRY ~i := #in~i; 6477#L12 assume !(~i <= 0); 6410#L14 call #t~ret0 := rec1(~i - 2);< 6409#rec1ENTRY ~i := #in~i; 6411#L12 assume ~i <= 0;#res := 0; 6497#rec1FINAL assume true; 6495#rec1EXIT >#27#return; 6419#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6425#rec1ENTRY ~i := #in~i; 6491#L12 assume ~i <= 0;#res := 0; 6490#rec1FINAL assume true; 6468#rec1EXIT >#29#return; 6469#L14-2 call #t~ret2 := rec1(#t~ret1);< 6481#rec1ENTRY ~i := #in~i; 6487#L12 assume ~i <= 0;#res := 0; 6486#rec1FINAL assume true; 6479#rec1EXIT >#31#return; 6478#L14-3 #res := 1 + #t~ret2;havoc #t~ret1;havoc #t~ret0;havoc #t~ret2; 6466#rec1FINAL assume true; 6467#rec1EXIT >#27#return; 6422#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6456#rec1ENTRY [2020-10-19 18:40:11,908 INFO L796 eck$LassoCheckResult]: Loop: 6456#rec1ENTRY ~i := #in~i; 6484#L12 assume !(~i <= 0); 6421#L14 call #t~ret0 := rec1(~i - 2);< 6439#rec1ENTRY ~i := #in~i; 6483#L12 assume !(~i <= 0); 6417#L14 call #t~ret0 := rec1(~i - 2);< 6440#rec1ENTRY ~i := #in~i; 6437#L12 assume ~i <= 0;#res := 0; 6416#rec1FINAL assume true; 6418#rec1EXIT >#27#return; 6419#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6425#rec1ENTRY ~i := #in~i; 6491#L12 assume ~i <= 0;#res := 0; 6490#rec1FINAL assume true; 6468#rec1EXIT >#29#return; 6469#L14-2 call #t~ret2 := rec1(#t~ret1);< 6481#rec1ENTRY ~i := #in~i; 6487#L12 assume ~i <= 0;#res := 0; 6486#rec1FINAL assume true; 6479#rec1EXIT >#31#return; 6478#L14-3 #res := 1 + #t~ret2;havoc #t~ret1;havoc #t~ret0;havoc #t~ret2; 6466#rec1FINAL assume true; 6467#rec1EXIT >#27#return; 6423#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6456#rec1ENTRY [2020-10-19 18:40:11,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:11,909 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2020-10-19 18:40:11,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:11,909 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710893391] [2020-10-19 18:40:11,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:11,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:11,916 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:11,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:11,921 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:11,924 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:11,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:11,925 INFO L82 PathProgramCache]: Analyzing trace with hash -165506564, now seen corresponding path program 1 times [2020-10-19 18:40:11,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:11,925 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205080499] [2020-10-19 18:40:11,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:11,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:11,931 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:11,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-19 18:40:11,935 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-19 18:40:11,938 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-19 18:40:11,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:11,938 INFO L82 PathProgramCache]: Analyzing trace with hash 2126813793, now seen corresponding path program 2 times [2020-10-19 18:40:11,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-19 18:40:11,939 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274062556] [2020-10-19 18:40:11,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-19 18:40:11,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:11,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-19 18:40:11,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:11,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-19 18:40:11,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:11,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-19 18:40:11,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:11,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-19 18:40:11,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:12,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-10-19 18:40:12,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:12,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-19 18:40:12,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:12,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-19 18:40:12,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:12,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-19 18:40:12,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:12,028 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 24 proven. 29 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2020-10-19 18:40:12,028 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274062556] [2020-10-19 18:40:12,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84987033] [2020-10-19 18:40:12,029 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-19 18:40:12,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-19 18:40:12,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-19 18:40:12,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-19 18:40:12,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:12,072 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 109 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-10-19 18:40:12,072 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-19 18:40:12,073 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-10-19 18:40:12,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890480316] [2020-10-19 18:40:12,318 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:12,319 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:12,319 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:12,319 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:12,319 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-19 18:40:12,319 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:12,320 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:12,320 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:12,320 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-10-19 18:40:12,320 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:12,320 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:12,321 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,334 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,342 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,345 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,352 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,354 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,393 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:12,394 INFO L404 LassoAnalysis]: Checking for nontermination... 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 [2020-10-19 18:40:12,397 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:12,398 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:12,400 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:12,400 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 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 [2020-10-19 18:40:12,423 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:12,423 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:12,425 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:12,425 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 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 [2020-10-19 18:40:12,450 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:12,450 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:12,453 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-19 18:40:12,453 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 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 [2020-10-19 18:40:12,475 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-19 18:40:12,475 INFO L160 nArgumentSynthesizer]: Using integer mode. 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) [2020-10-19 18:40:12,500 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-19 18:40:12,500 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-19 18:40:12,504 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:12,524 INFO L210 LassoAnalysis]: Preferences: [2020-10-19 18:40:12,524 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-19 18:40:12,524 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-19 18:40:12,524 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-19 18:40:12,524 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-19 18:40:12,524 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:12,524 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-19 18:40:12,525 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-19 18:40:12,525 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-10-19 18:40:12,525 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-19 18:40:12,525 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-19 18:40:12,526 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,528 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,529 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,536 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,538 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,541 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-19 18:40:12,574 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-19 18:40:12,575 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:12,581 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 [2020-10-19 18:40:12,582 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:12,582 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:12,582 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:12,582 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:12,583 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:12,583 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:12,583 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:12,584 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:12,605 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 [2020-10-19 18:40:12,607 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:12,607 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:12,607 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:12,607 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:12,607 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:12,608 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:12,608 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:12,609 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 59 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:12,632 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 [2020-10-19 18:40:12,634 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-19 18:40:12,634 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-19 18:40:12,634 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-19 18:40:12,634 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-19 18:40:12,634 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-19 18:40:12,635 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-19 18:40:12,635 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-19 18:40:12,637 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-19 18:40:12,640 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-10-19 18:40:12,640 INFO L444 ModelExtractionUtils]: 0 out of 3 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-19 18:40:12,642 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-19 18:40:12,643 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-19 18:40:12,643 INFO L510 LassoAnalysis]: Proved termination. [2020-10-19 18:40:12,643 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-10-19 18:40:12,668 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-19 18:40:12,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:12,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:12,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-19 18:40:12,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:12,748 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:12,751 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:12,755 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:12,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:12,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-19 18:40:12,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:13,004 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-19 18:40:13,004 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 9 loop predicates [2020-10-19 18:40:13,005 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-10-19 18:40:13,070 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26. Second operand 11 states. Result 100 states and 122 transitions. Complement of second has 7 states. [2020-10-19 18:40:13,070 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 [2020-10-19 18:40:13,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-19 18:40:13,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-10-19 18:40:13,071 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-10-19 18:40:13,072 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:13,072 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-19 18:40:13,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:13,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:13,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-19 18:40:13,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:13,142 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:13,145 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:13,147 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:13,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:13,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-19 18:40:13,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:13,318 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-19 18:40:13,319 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 9 loop predicates [2020-10-19 18:40:13,319 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-10-19 18:40:13,382 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26. Second operand 11 states. Result 100 states and 122 transitions. Complement of second has 7 states. [2020-10-19 18:40:13,383 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 [2020-10-19 18:40:13,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-19 18:40:13,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-10-19 18:40:13,383 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-10-19 18:40:13,384 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:13,384 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-19 18:40:13,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:13,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:13,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-19 18:40:13,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:13,453 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:13,455 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:13,457 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:13,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:13,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-19 18:40:13,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:13,603 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-19 18:40:13,604 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 9 loop predicates [2020-10-19 18:40:13,604 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-10-19 18:40:13,948 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26. Second operand 11 states. Result 257 states and 303 transitions. Complement of second has 31 states. [2020-10-19 18:40:13,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 11 states 2 stem states 8 non-accepting loop states 1 accepting loop states [2020-10-19 18:40:13,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-19 18:40:13,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 38 transitions. [2020-10-19 18:40:13,949 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 38 transitions. Stem has 29 letters. Loop has 24 letters. [2020-10-19 18:40:13,949 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:13,950 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-19 18:40:13,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-19 18:40:13,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:14,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-19 18:40:14,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:14,020 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:14,023 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:14,025 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-19 18:40:14,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-19 18:40:14,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-19 18:40:14,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-19 18:40:14,199 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-19 18:40:14,200 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and with honda bouncer for loop.2 stem predicates 9 loop predicates [2020-10-19 18:40:14,200 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-10-19 18:40:14,762 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26. Second operand 11 states. Result 409 states and 515 transitions. Complement of second has 80 states. [2020-10-19 18:40:14,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 15 states 2 stem states 12 non-accepting loop states 1 accepting loop states [2020-10-19 18:40:14,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-19 18:40:14,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 49 transitions. [2020-10-19 18:40:14,765 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 24 letters. [2020-10-19 18:40:14,765 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:14,765 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 53 letters. Loop has 24 letters. [2020-10-19 18:40:14,768 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:14,768 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 48 letters. [2020-10-19 18:40:14,769 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-19 18:40:14,770 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 409 states and 515 transitions. [2020-10-19 18:40:14,778 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 62 [2020-10-19 18:40:14,782 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 409 states to 253 states and 345 transitions. [2020-10-19 18:40:14,782 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 154 [2020-10-19 18:40:14,783 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 164 [2020-10-19 18:40:14,783 INFO L73 IsDeterministic]: Start isDeterministic. Operand 253 states and 345 transitions. [2020-10-19 18:40:14,783 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-19 18:40:14,783 INFO L691 BuchiCegarLoop]: Abstraction has 253 states and 345 transitions. [2020-10-19 18:40:14,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states and 345 transitions. [2020-10-19 18:40:14,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 216. [2020-10-19 18:40:14,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-10-19 18:40:14,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 270 transitions. [2020-10-19 18:40:14,794 INFO L714 BuchiCegarLoop]: Abstraction has 216 states and 270 transitions. [2020-10-19 18:40:14,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-19 18:40:14,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-19 18:40:14,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-10-19 18:40:14,795 INFO L87 Difference]: Start difference. First operand 216 states and 270 transitions. Second operand 8 states. [2020-10-19 18:40:14,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-19 18:40:14,849 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-10-19 18:40:14,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-19 18:40:14,850 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 35 states and 37 transitions. [2020-10-19 18:40:14,851 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-10-19 18:40:14,851 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 35 states to 0 states and 0 transitions. [2020-10-19 18:40:14,851 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-10-19 18:40:14,851 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-10-19 18:40:14,851 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-10-19 18:40:14,851 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-10-19 18:40:14,851 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-19 18:40:14,851 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-19 18:40:14,851 INFO L594 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-19 18:40:14,851 INFO L427 BuchiCegarLoop]: ======== Iteration 9============ [2020-10-19 18:40:14,852 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2020-10-19 18:40:14,852 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-10-19 18:40:14,852 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2020-10-19 18:40:14,860 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 19.10 06:40:14 BoogieIcfgContainer [2020-10-19 18:40:14,860 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-10-19 18:40:14,861 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-19 18:40:14,862 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-19 18:40:14,862 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-19 18:40:14,862 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.10 06:39:58" (3/4) ... [2020-10-19 18:40:14,865 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-10-19 18:40:14,865 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-19 18:40:14,867 INFO L168 Benchmark]: Toolchain (without parser) took 16876.92 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 314.6 MB). Free memory was 958.6 MB in the beginning and 958.8 MB in the end (delta: -190.2 kB). Peak memory consumption was 314.4 MB. Max. memory is 11.5 GB. [2020-10-19 18:40:14,868 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2020-10-19 18:40:14,869 INFO L168 Benchmark]: CACSL2BoogieTranslator took 234.97 ms. Allocated memory is still 1.0 GB. Free memory was 958.6 MB in the beginning and 947.9 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2020-10-19 18:40:14,869 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.29 ms. Allocated memory is still 1.0 GB. Free memory is still 947.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2020-10-19 18:40:14,870 INFO L168 Benchmark]: Boogie Preprocessor took 79.86 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.9 MB). Free memory was 947.9 MB in the beginning and 1.1 GB in the end (delta: -175.0 MB). Peak memory consumption was 15.2 MB. Max. memory is 11.5 GB. [2020-10-19 18:40:14,871 INFO L168 Benchmark]: RCFGBuilder took 244.57 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 18.7 MB). Peak memory consumption was 18.7 MB. Max. memory is 11.5 GB. [2020-10-19 18:40:14,875 INFO L168 Benchmark]: BuchiAutomizer took 16272.32 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 187.7 MB). Free memory was 1.1 GB in the beginning and 958.8 MB in the end (delta: 145.4 MB). Peak memory consumption was 333.1 MB. Max. memory is 11.5 GB. [2020-10-19 18:40:14,877 INFO L168 Benchmark]: Witness Printer took 3.94 ms. Allocated memory is still 1.3 GB. Free memory is still 958.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2020-10-19 18:40:14,881 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 234.97 ms. Allocated memory is still 1.0 GB. Free memory was 958.6 MB in the beginning and 947.9 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 29.29 ms. Allocated memory is still 1.0 GB. Free memory is still 947.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 79.86 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.9 MB). Free memory was 947.9 MB in the beginning and 1.1 GB in the end (delta: -175.0 MB). Peak memory consumption was 15.2 MB. Max. memory is 11.5 GB. * RCFGBuilder took 244.57 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 18.7 MB). Peak memory consumption was 18.7 MB. Max. memory is 11.5 GB. * BuchiAutomizer took 16272.32 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 187.7 MB). Free memory was 1.1 GB in the beginning and 958.8 MB in the end (delta: 145.4 MB). Peak memory consumption was 333.1 MB. Max. memory is 11.5 GB. * Witness Printer took 3.94 ms. Allocated memory is still 1.3 GB. Free memory is still 958.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: Constructed decomposition of program Your program was decomposed into 12 terminating modules (5 trivial, 5 deterministic, 2 nondeterministic). One deterministic module has affine ranking function \old(j) and consists of 11 locations. One deterministic module has affine ranking function \old(i) and consists of 4 locations. One deterministic module has affine ranking function \old(i) and consists of 5 locations. One deterministic module has affine ranking function org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@adb2bc and consists of 11 locations. One deterministic module has affine ranking function i and consists of 5 locations. One nondeterministic module has affine ranking function \old(i) and consists of 5 locations. One nondeterministic module has affine ranking function \old(i) and consists of 15 locations. 5 modules have a trivial ranking function, the largest among these consists of 11 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 16.2s and 9 iterations. TraceHistogramMax:5. Analysis of lassos took 9.9s. Construction of modules took 1.1s. Büchi inclusion checks took 4.4s. Highest rank in rank-based complementation 3. Minimization of det autom 1. Minimization of nondet autom 11. Automata minimization 0.2s AutomataMinimizationTime, 11 MinimizatonAttempts, 249 StatesRemovedByMinimization, 11 NontrivialMinimizations. Non-live state removal took 0.2s Buchi closure took 0.0s. Biggest automaton had 314 states and ocurred in iteration 5. Nontrivial modules had stage [5, 0, 1, 1, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 38/58 HoareTripleCheckerStatistics: 288 SDtfs, 338 SDslu, 505 SDs, 0 SdLazy, 952 SolverSat, 325 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time LassoAnalysisResults: nont0 unkn0 SFLI1 SFLT3 conc0 concLT3 SILN0 SILU0 SILI0 SILT1 lasso0 LassoPreprocessingBenchmarks: Lassos: inital13 mio100 ax100 hnf92 lsp100 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq155 hnf92 smp100 dnf100 smp100 tf112 neg100 sie110 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 23ms VariablesStem: 0 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 0 MotzkinApplications: 2 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 14 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 7 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 5.7s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...