./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 9a8b2e8d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerTermination.xml -i ../sv-benchmarks/c/termination-crafted/NestedRecursion_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 0.1.25-9a8b2e8 [2020-10-20 06:32:54,764 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-20 06:32:54,767 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-20 06:32:54,794 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-20 06:32:54,794 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-20 06:32:54,796 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-20 06:32:54,797 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-20 06:32:54,799 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-20 06:32:54,801 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-20 06:32:54,802 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-20 06:32:54,803 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-20 06:32:54,805 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-20 06:32:54,805 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-20 06:32:54,806 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-20 06:32:54,807 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-20 06:32:54,809 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-20 06:32:54,810 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-20 06:32:54,811 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-20 06:32:54,812 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-20 06:32:54,815 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-20 06:32:54,817 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-20 06:32:54,818 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-20 06:32:54,820 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-20 06:32:54,827 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-20 06:32:54,830 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-20 06:32:54,836 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-20 06:32:54,836 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-20 06:32:54,837 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-20 06:32:54,838 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-20 06:32:54,839 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-20 06:32:54,840 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-20 06:32:54,843 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-20 06:32:54,844 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-20 06:32:54,846 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-20 06:32:54,847 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-20 06:32:54,848 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-20 06:32:54,849 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-20 06:32:54,849 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-20 06:32:54,850 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-20 06:32:54,851 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-20 06:32:54,852 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-20 06:32:54,854 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-10-20 06:32:54,903 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-20 06:32:54,903 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-20 06:32:54,905 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-20 06:32:54,905 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-20 06:32:54,906 INFO L138 SettingsManager]: * Use SBE=true [2020-10-20 06:32:54,906 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-10-20 06:32:54,906 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-10-20 06:32:54,906 INFO L138 SettingsManager]: * Use old map elimination=false [2020-10-20 06:32:54,907 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-10-20 06:32:54,907 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-10-20 06:32:54,908 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-10-20 06:32:54,909 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-20 06:32:54,909 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-10-20 06:32:54,909 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-20 06:32:54,910 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-20 06:32:54,910 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-10-20 06:32:54,910 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-10-20 06:32:54,911 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-10-20 06:32:54,911 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-20 06:32:54,911 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-10-20 06:32:54,912 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-20 06:32:54,912 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-10-20 06:32:54,912 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-20 06:32:54,912 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-20 06:32:54,913 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-10-20 06:32:54,913 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-20 06:32:54,913 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-20 06:32:54,913 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-20 06:32:54,914 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-10-20 06:32:54,915 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-10-20 06:32:54,916 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 [2020-10-20 06:32:55,115 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 06:32:55,126 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 06:32:55,130 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 06:32:55,132 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 06:32:55,132 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 06:32:55,133 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-10-20 06:32:55,202 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/627ffd8a7/aa45418dcfa742949c373df7f2a632c8/FLAGb54a02d24 [2020-10-20 06:32:55,702 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 06:32:55,702 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/termination-crafted/NestedRecursion_1b.c [2020-10-20 06:32:55,713 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/627ffd8a7/aa45418dcfa742949c373df7f2a632c8/FLAGb54a02d24 [2020-10-20 06:32:56,018 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/627ffd8a7/aa45418dcfa742949c373df7f2a632c8 [2020-10-20 06:32:56,021 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 06:32:56,029 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 06:32:56,030 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 06:32:56,030 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 06:32:56,035 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 06:32:56,036 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,040 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56dfc410 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56, skipping insertion in model container [2020-10-20 06:32:56,040 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,048 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 06:32:56,063 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 06:32:56,290 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 06:32:56,293 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 06:32:56,308 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 06:32:56,322 INFO L208 MainTranslator]: Completed translation [2020-10-20 06:32:56,323 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56 WrapperNode [2020-10-20 06:32:56,323 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 06:32:56,324 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 06:32:56,324 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 06:32:56,324 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 06:32:56,331 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,335 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,354 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 06:32:56,355 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 06:32:56,355 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 06:32:56,355 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 06:32:56,365 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,365 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,366 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,366 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,369 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,371 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,371 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... [2020-10-20 06:32:56,372 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 06:32:56,373 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 06:32:56,373 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 06:32:56,373 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 06:32:56,374 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:56,436 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-10-20 06:32:56,436 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-10-20 06:32:56,436 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-10-20 06:32:56,436 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-10-20 06:32:56,436 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 06:32:56,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 06:32:56,608 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 06:32:56,609 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-10-20 06:32:56,611 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:32:56 BoogieIcfgContainer [2020-10-20 06:32:56,611 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 06:32:56,611 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-10-20 06:32:56,612 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-10-20 06:32:56,615 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-10-20 06:32:56,616 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:32:56,617 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 20.10 06:32:56" (1/3) ... [2020-10-20 06:32:56,618 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@6233d224 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 20.10 06:32:56, skipping insertion in model container [2020-10-20 06:32:56,618 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:32:56,618 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 06:32:56" (2/3) ... [2020-10-20 06:32:56,619 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@6233d224 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 20.10 06:32:56, skipping insertion in model container [2020-10-20 06:32:56,619 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-10-20 06:32:56,619 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:32:56" (3/3) ... [2020-10-20 06:32:56,621 INFO L373 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1b.c [2020-10-20 06:32:56,670 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-10-20 06:32:56,671 INFO L360 BuchiCegarLoop]: Hoare is false [2020-10-20 06:32:56,671 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-10-20 06:32:56,671 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 06:32:56,671 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 06:32:56,671 INFO L364 BuchiCegarLoop]: Difference is false [2020-10-20 06:32:56,671 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 06:32:56,671 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-10-20 06:32:56,686 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-10-20 06:32:56,712 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:56,712 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:32:56,712 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:32:56,720 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-20 06:32:56,720 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:32:56,720 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-10-20 06:32:56,721 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-10-20 06:32:56,724 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:56,724 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:32:56,724 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:32:56,725 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-10-20 06:32:56,725 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:32:56,732 INFO L794 eck$LassoCheckResult]: Stem: 13#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 22#L25true call main_#t~ret6 := rec2(main_~x~0);< 3#rec2ENTRYtrue [2020-10-20 06:32:56,732 INFO L796 eck$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 [2020-10-20 06:32:56,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:56,738 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2020-10-20 06:32:56,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:56,746 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578693644] [2020-10-20 06:32:56,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:56,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:56,810 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:56,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:56,813 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:56,833 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:56,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:56,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2020-10-20 06:32:56,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:56,841 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69267839] [2020-10-20 06:32:56,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:56,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:56,859 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:56,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:56,866 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:56,871 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:56,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:56,874 INFO L82 PathProgramCache]: Analyzing trace with hash -1371489668, now seen corresponding path program 1 times [2020-10-20 06:32:56,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:56,874 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197828491] [2020-10-20 06:32:56,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:56,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:56,883 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:56,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:56,890 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:56,893 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:57,128 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:32:57,129 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:32:57,130 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:32:57,130 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:32:57,130 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:32:57,130 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,131 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:32:57,131 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:32:57,131 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-10-20 06:32:57,131 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:32:57,132 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:32:57,157 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,167 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,172 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,177 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,182 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,325 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:32:57,326 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) [2020-10-20 06:32:57,342 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:57,342 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,354 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:57,354 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_~j=0} Honda state: {rec2_~j=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,391 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:57,392 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:32:57,396 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:57,396 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#t~ret3=0} Honda state: {rec2_#t~ret3=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,430 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:57,431 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:32:57,437 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:57,437 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#res=0} Honda state: {rec2_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,466 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:57,466 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:32:57,470 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:57,470 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#t~ret4=0} Honda state: {rec2_#t~ret4=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,496 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:57,496 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:32:57,545 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:32:57,545 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:32:57,560 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,592 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:32:57,592 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:32:57,592 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:32:57,592 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:32:57,593 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:32:57,593 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,593 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:32:57,593 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:32:57,593 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration1_Loop [2020-10-20 06:32:57,593 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:32:57,593 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:32:57,596 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,603 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,607 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,612 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,622 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:57,676 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:32:57,682 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,691 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:57,694 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:57,695 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:57,696 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:57,696 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:57,696 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:32:57,702 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:57,704 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:32:57,708 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) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,756 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:57,759 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:57,759 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:57,760 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:57,760 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:57,760 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:32:57,763 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:57,764 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:32:57,766 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) [2020-10-20 06:32:57,816 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:57,818 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:57,819 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:57,819 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:57,819 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:57,819 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,822 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:57,822 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:32:57,824 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,868 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:57,870 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:57,870 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:57,871 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:57,871 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:57,871 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:32:57,873 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:57,873 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:32:57,876 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:32:57,882 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-10-20 06:32:57,883 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) [2020-10-20 06:32:57,897 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:32:57,897 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:32:57,898 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:32:57,899 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#in~j) = 1*rec2_#in~j Supporting invariants [] Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:57,956 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:32:57,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:58,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:32:58,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-10-20 06:32:58,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:32:58,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:32:58,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 11 conjunts are in the unsatisfiable core [2020-10-20 06:32:58,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:32:58,148 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:32:58,163 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 [2020-10-20 06:32:58,164 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 21 states. Second operand 7 states. [2020-10-20 06:32:58,704 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. [2020-10-20 06:32:58,705 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 [2020-10-20 06:32:58,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-10-20 06:32:58,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 57 transitions. [2020-10-20 06:32:58,712 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 8 letters. [2020-10-20 06:32:58,716 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:32:58,716 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 10 letters. Loop has 8 letters. [2020-10-20 06:32:58,716 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:32:58,717 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 57 transitions. Stem has 2 letters. Loop has 16 letters. [2020-10-20 06:32:58,717 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:32:58,718 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 194 states and 279 transitions. [2020-10-20 06:32:58,738 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:58,753 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 194 states to 82 states and 120 transitions. [2020-10-20 06:32:58,754 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 35 [2020-10-20 06:32:58,755 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 38 [2020-10-20 06:32:58,755 INFO L73 IsDeterministic]: Start isDeterministic. Operand 82 states and 120 transitions. [2020-10-20 06:32:58,756 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:32:58,756 INFO L691 BuchiCegarLoop]: Abstraction has 82 states and 120 transitions. [2020-10-20 06:32:58,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states and 120 transitions. [2020-10-20 06:32:58,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-10-20 06:32:58,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-10-20 06:32:58,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 83 transitions. [2020-10-20 06:32:58,805 INFO L714 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-10-20 06:32:58,805 INFO L594 BuchiCegarLoop]: Abstraction has 55 states and 83 transitions. [2020-10-20 06:32:58,805 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-10-20 06:32:58,805 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 55 states and 83 transitions. [2020-10-20 06:32:58,807 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:58,807 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:32:58,808 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:32:58,808 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:32:58,808 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-20 06:32:58,809 INFO L794 eck$LassoCheckResult]: Stem: 378#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 345#L25 call main_#t~ret6 := rec2(main_~x~0);< 344#rec2ENTRY ~j := #in~j; 347#L18 assume !(~j <= 0); 363#L20 call #t~ret3 := rec1(~j - 1);< 379#rec1ENTRY ~i := #in~i; 397#L12 assume !(~i <= 0); 351#L14 call #t~ret0 := rec1(~i - 2);< 350#rec1ENTRY [2020-10-20 06:32:58,809 INFO L796 eck$LassoCheckResult]: Loop: 350#rec1ENTRY ~i := #in~i; 358#L12 assume !(~i <= 0); 354#L14 call #t~ret0 := rec1(~i - 2);< 350#rec1ENTRY [2020-10-20 06:32:58,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:58,809 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2020-10-20 06:32:58,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:58,810 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782203966] [2020-10-20 06:32:58,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:58,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:58,819 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:58,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:58,825 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:58,828 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:58,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:58,828 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2020-10-20 06:32:58,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:58,829 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805907280] [2020-10-20 06:32:58,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:58,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:58,833 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:58,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:58,836 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:58,837 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:58,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:58,838 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2020-10-20 06:32:58,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:58,839 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542847060] [2020-10-20 06:32:58,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:58,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:58,847 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:58,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:58,854 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:58,856 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:58,913 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:32:58,914 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:32:58,914 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:32:58,914 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:32:58,914 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:32:58,915 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:58,915 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:32:58,915 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:32:58,916 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-10-20 06:32:58,916 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:32:58,916 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:32:58,918 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:58,923 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:58,926 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:58,929 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:58,932 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:58,935 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:58,976 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:32:58,976 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:32:58,980 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:58,980 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:58,984 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:58,984 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) [2020-10-20 06:32:59,033 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:59,033 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,038 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:59,038 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) [2020-10-20 06:32:59,088 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:59,088 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,092 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:59,092 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) [2020-10-20 06:32:59,141 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:59,141 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,145 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:59,146 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 [2020-10-20 06:32:59,190 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:59,191 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:32:59,196 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:32:59,197 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) [2020-10-20 06:32:59,241 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:32:59,241 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) [2020-10-20 06:32:59,294 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:32:59,294 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,330 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:32:59,332 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:32:59,332 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:32:59,332 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:32:59,333 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:32:59,333 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:32:59,333 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,333 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:32:59,333 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:32:59,333 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration2_Loop [2020-10-20 06:32:59,333 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:32:59,334 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:32:59,335 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:59,338 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:59,340 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:59,342 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:59,352 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:59,358 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:32:59,389 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:32:59,389 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) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,398 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:59,400 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:59,400 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:59,400 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:59,400 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:59,401 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:32:59,402 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:59,402 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:32:59,404 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-10-20 06:32:59,442 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:59,444 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:59,444 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:59,444 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:59,445 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:59,445 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:32:59,446 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:59,446 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,448 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,482 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:59,483 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:59,483 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:59,483 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:59,483 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:59,484 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:32:59,484 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:59,485 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:32:59,487 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) [2020-10-20 06:32:59,525 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:59,527 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:59,527 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:59,527 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:59,527 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:59,527 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:32:59,528 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:59,528 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,535 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) [2020-10-20 06:32:59,561 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:32:59,563 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:32:59,564 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:32:59,564 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:32:59,564 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:32:59,564 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:32:59,565 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:32:59,565 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,572 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:32:59,575 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:32:59,576 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) [2020-10-20 06:32:59,583 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:32:59,584 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:32:59,584 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:32:59,584 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:32:59,608 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:32:59,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:59,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:32:59,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-20 06:32:59,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:32:59,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:32:59,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:32:59,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:32:59,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:32:59,748 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 3 loop predicates [2020-10-20 06:32:59,748 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 55 states and 83 transitions. cyclomatic complexity: 32 Second operand 4 states. [2020-10-20 06:32:59,812 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. [2020-10-20 06:32:59,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:32:59,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-10-20 06:32:59,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 17 transitions. [2020-10-20 06:32:59,815 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 3 letters. [2020-10-20 06:32:59,815 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:32:59,815 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 11 letters. Loop has 3 letters. [2020-10-20 06:32:59,816 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:32:59,816 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 17 transitions. Stem has 8 letters. Loop has 6 letters. [2020-10-20 06:32:59,816 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:32:59,817 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 105 states and 149 transitions. [2020-10-20 06:32:59,820 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:59,824 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 105 states to 93 states and 137 transitions. [2020-10-20 06:32:59,825 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 37 [2020-10-20 06:32:59,825 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 39 [2020-10-20 06:32:59,825 INFO L73 IsDeterministic]: Start isDeterministic. Operand 93 states and 137 transitions. [2020-10-20 06:32:59,827 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:32:59,827 INFO L691 BuchiCegarLoop]: Abstraction has 93 states and 137 transitions. [2020-10-20 06:32:59,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states and 137 transitions. [2020-10-20 06:32:59,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2020-10-20 06:32:59,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-10-20 06:32:59,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 129 transitions. [2020-10-20 06:32:59,840 INFO L714 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-10-20 06:32:59,840 INFO L594 BuchiCegarLoop]: Abstraction has 89 states and 129 transitions. [2020-10-20 06:32:59,840 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-10-20 06:32:59,840 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 89 states and 129 transitions. [2020-10-20 06:32:59,842 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:32:59,842 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:32:59,842 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:32:59,843 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:32:59,843 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-20 06:32:59,843 INFO L794 eck$LassoCheckResult]: Stem: 613#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 614#L25 call main_#t~ret6 := rec2(main_~x~0);< 620#rec2ENTRY ~j := #in~j; 633#L18 assume !(~j <= 0); 615#L20 call #t~ret3 := rec1(~j - 1);< 642#rec1ENTRY ~i := #in~i; 637#L12 assume !(~i <= 0); 577#L14 call #t~ret0 := rec1(~i - 2);< 576#rec1ENTRY ~i := #in~i; 579#L12 assume ~i <= 0;#res := 0; 583#rec1FINAL assume true; 584#rec1EXIT >#27#return; 593#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 595#rec1ENTRY [2020-10-20 06:32:59,844 INFO L796 eck$LassoCheckResult]: Loop: 595#rec1ENTRY ~i := #in~i; 632#L12 assume !(~i <= 0); 589#L14 call #t~ret0 := rec1(~i - 2);< 595#rec1ENTRY [2020-10-20 06:32:59,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:59,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2020-10-20 06:32:59,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:59,845 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292737632] [2020-10-20 06:32:59,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:59,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:59,853 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:59,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:59,860 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:59,862 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:59,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:59,863 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2020-10-20 06:32:59,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:59,863 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975426620] [2020-10-20 06:32:59,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:59,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:59,867 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:59,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:32:59,870 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:32:59,871 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:32:59,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:32:59,872 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2020-10-20 06:32:59,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:32:59,872 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053512328] [2020-10-20 06:32:59,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:32:59,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:32:59,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:32:59,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:32:59,966 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-20 06:32:59,966 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053512328] [2020-10-20 06:32:59,967 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 06:32:59,967 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-20 06:32:59,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741675117] [2020-10-20 06:33:00,006 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:00,006 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:00,006 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:00,006 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:00,006 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:00,006 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:00,006 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:00,007 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:00,007 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-10-20 06:33:00,007 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:00,007 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:00,008 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,010 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,016 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,019 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,021 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,023 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,057 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:00,057 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) [2020-10-20 06:33:00,060 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:00,060 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:00,064 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:00,064 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) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:00,093 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:00,093 INFO L160 nArgumentSynthesizer]: Using integer mode. 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 [2020-10-20 06:33:00,119 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:00,119 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:00,163 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:00,165 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:00,165 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:00,165 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:00,165 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:00,166 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:00,166 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:00,166 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:00,166 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:00,166 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration3_Loop [2020-10-20 06:33:00,166 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:00,166 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:00,167 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,170 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,175 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,178 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,180 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,182 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:00,213 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:00,215 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) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:00,224 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:00,226 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:00,226 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:00,226 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:00,226 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:00,226 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:00,227 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:00,227 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:00,229 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:00,253 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:00,254 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:00,254 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:00,254 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:00,261 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:00,261 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:00,264 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:00,264 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:00,266 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:00,268 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:33:00,268 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) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:00,271 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:00,271 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:00,271 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:00,271 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-10-20 06:33:00,293 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:00,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:00,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-10-20 06:33:00,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:00,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:00,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:00,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:00,409 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:00,409 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 89 states and 129 transitions. cyclomatic complexity: 47 Second operand 5 states. [2020-10-20 06:33:00,532 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. [2020-10-20 06:33:00,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:00,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:00,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 19 transitions. [2020-10-20 06:33:00,536 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 3 letters. [2020-10-20 06:33:00,536 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:00,536 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 16 letters. Loop has 3 letters. [2020-10-20 06:33:00,537 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:00,537 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 19 transitions. Stem has 13 letters. Loop has 6 letters. [2020-10-20 06:33:00,537 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:00,537 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 134 states and 193 transitions. [2020-10-20 06:33:00,542 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:00,552 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 134 states to 122 states and 181 transitions. [2020-10-20 06:33:00,552 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 48 [2020-10-20 06:33:00,553 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2020-10-20 06:33:00,553 INFO L73 IsDeterministic]: Start isDeterministic. Operand 122 states and 181 transitions. [2020-10-20 06:33:00,553 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:00,553 INFO L691 BuchiCegarLoop]: Abstraction has 122 states and 181 transitions. [2020-10-20 06:33:00,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states and 181 transitions. [2020-10-20 06:33:00,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 113. [2020-10-20 06:33:00,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-10-20 06:33:00,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 165 transitions. [2020-10-20 06:33:00,566 INFO L714 BuchiCegarLoop]: Abstraction has 113 states and 165 transitions. [2020-10-20 06:33:00,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:00,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-20 06:33:00,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-20 06:33:00,571 INFO L87 Difference]: Start difference. First operand 113 states and 165 transitions. Second operand 6 states. [2020-10-20 06:33:00,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:00,628 INFO L93 Difference]: Finished difference Result 123 states and 175 transitions. [2020-10-20 06:33:00,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-20 06:33:00,630 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 123 states and 175 transitions. [2020-10-20 06:33:00,634 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2020-10-20 06:33:00,638 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 123 states to 121 states and 173 transitions. [2020-10-20 06:33:00,639 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 55 [2020-10-20 06:33:00,639 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 55 [2020-10-20 06:33:00,639 INFO L73 IsDeterministic]: Start isDeterministic. Operand 121 states and 173 transitions. [2020-10-20 06:33:00,640 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:00,640 INFO L691 BuchiCegarLoop]: Abstraction has 121 states and 173 transitions. [2020-10-20 06:33:00,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states and 173 transitions. [2020-10-20 06:33:00,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 101. [2020-10-20 06:33:00,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-10-20 06:33:00,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 143 transitions. [2020-10-20 06:33:00,653 INFO L714 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-10-20 06:33:00,653 INFO L594 BuchiCegarLoop]: Abstraction has 101 states and 143 transitions. [2020-10-20 06:33:00,653 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-10-20 06:33:00,653 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 101 states and 143 transitions. [2020-10-20 06:33:00,655 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2020-10-20 06:33:00,655 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:00,656 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:00,657 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:00,657 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:00,657 INFO L794 eck$LassoCheckResult]: Stem: 1167#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1168#L25 call main_#t~ret6 := rec2(main_~x~0);< 1174#rec2ENTRY ~j := #in~j; 1185#L18 assume !(~j <= 0); 1146#L20 call #t~ret3 := rec1(~j - 1);< 1184#rec1ENTRY ~i := #in~i; 1183#L12 assume !(~i <= 0); 1156#L14 call #t~ret0 := rec1(~i - 2);< 1181#rec1ENTRY ~i := #in~i; 1179#L12 assume !(~i <= 0); 1161#L14 call #t~ret0 := rec1(~i - 2);< 1178#rec1ENTRY ~i := #in~i; 1180#L12 assume ~i <= 0;#res := 0; 1222#rec1FINAL assume true; 1166#rec1EXIT >#27#return; 1133#L14-1 [2020-10-20 06:33:00,657 INFO L796 eck$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 [2020-10-20 06:33:00,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:00,658 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2020-10-20 06:33:00,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:00,658 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012042727] [2020-10-20 06:33:00,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:00,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:00,666 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:00,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:00,673 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:00,675 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:00,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:00,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2020-10-20 06:33:00,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:00,676 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108859201] [2020-10-20 06:33:00,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:00,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-20 06:33:00,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-20 06:33:00,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,729 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-20 06:33:00,730 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108859201] [2020-10-20 06:33:00,730 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897639920] [2020-10-20 06:33:00,730 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 [2020-10-20 06:33:00,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-10-20 06:33:00,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:00,769 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:00,770 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-10-20 06:33:00,770 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2020-10-20 06:33:00,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378880794] [2020-10-20 06:33:00,771 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-10-20 06:33:00,771 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:00,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-20 06:33:00,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-20 06:33:00,772 INFO L87 Difference]: Start difference. First operand 101 states and 143 transitions. cyclomatic complexity: 49 Second operand 6 states. [2020-10-20 06:33:00,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:00,831 INFO L93 Difference]: Finished difference Result 117 states and 161 transitions. [2020-10-20 06:33:00,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-20 06:33:00,832 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 117 states and 161 transitions. [2020-10-20 06:33:00,835 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:00,838 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 117 states to 117 states and 161 transitions. [2020-10-20 06:33:00,839 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 53 [2020-10-20 06:33:00,839 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 53 [2020-10-20 06:33:00,839 INFO L73 IsDeterministic]: Start isDeterministic. Operand 117 states and 161 transitions. [2020-10-20 06:33:00,840 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:00,840 INFO L691 BuchiCegarLoop]: Abstraction has 117 states and 161 transitions. [2020-10-20 06:33:00,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states and 161 transitions. [2020-10-20 06:33:00,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2020-10-20 06:33:00,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-10-20 06:33:00,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 157 transitions. [2020-10-20 06:33:00,850 INFO L714 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-10-20 06:33:00,851 INFO L594 BuchiCegarLoop]: Abstraction has 113 states and 157 transitions. [2020-10-20 06:33:00,851 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-10-20 06:33:00,851 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 113 states and 157 transitions. [2020-10-20 06:33:00,852 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-10-20 06:33:00,853 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:00,853 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:00,854 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:00,855 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:00,855 INFO L794 eck$LassoCheckResult]: Stem: 1445#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1446#L25 call main_#t~ret6 := rec2(main_~x~0);< 1458#rec2ENTRY ~j := #in~j; 1471#L18 assume !(~j <= 0); 1422#L20 call #t~ret3 := rec1(~j - 1);< 1470#rec1ENTRY ~i := #in~i; 1469#L12 assume !(~i <= 0); 1418#L14 call #t~ret0 := rec1(~i - 2);< 1467#rec1ENTRY ~i := #in~i; 1440#L12 assume ~i <= 0;#res := 0; 1417#rec1FINAL assume true; 1419#rec1EXIT >#27#return; 1410#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1441#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1434#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 1435#rec1FINAL assume true; 1464#rec1EXIT >#33#return; 1404#L20-1 [2020-10-20 06:33:00,855 INFO L796 eck$LassoCheckResult]: Loop: 1404#L20-1 call #t~ret4 := rec2(#t~ret3);< 1403#rec2ENTRY ~j := #in~j; 1405#L18 assume !(~j <= 0); 1452#L20 call #t~ret3 := rec1(~j - 1);< 1454#rec1ENTRY ~i := #in~i; 1512#L12 assume !(~i <= 0); 1447#L14 call #t~ret0 := rec1(~i - 2);< 1454#rec1ENTRY ~i := #in~i; 1512#L12 assume ~i <= 0;#res := 0; 1511#rec1FINAL assume true; 1507#rec1EXIT >#27#return; 1411#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1409#rec1ENTRY ~i := #in~i; 1412#L12 assume ~i <= 0;#res := 0; 1515#rec1FINAL assume true; 1509#rec1EXIT >#29#return; 1506#L14-2 call #t~ret2 := rec1(#t~ret1);< 1442#rec1ENTRY ~i := #in~i; 1510#L12 assume ~i <= 0;#res := 0; 1508#rec1FINAL assume true; 1505#rec1EXIT >#31#return; 1463#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 1475#rec1FINAL assume true; 1461#rec1EXIT >#33#return; 1404#L20-1 [2020-10-20 06:33:00,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:00,856 INFO L82 PathProgramCache]: Analyzing trace with hash -790062692, now seen corresponding path program 1 times [2020-10-20 06:33:00,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:00,856 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880653662] [2020-10-20 06:33:00,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:00,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:00,867 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:00,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:00,876 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:00,879 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:00,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:00,880 INFO L82 PathProgramCache]: Analyzing trace with hash 125202860, now seen corresponding path program 1 times [2020-10-20 06:33:00,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:00,881 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324119308] [2020-10-20 06:33:00,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:00,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:00,890 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:00,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:00,898 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:00,901 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:00,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:00,902 INFO L82 PathProgramCache]: Analyzing trace with hash -2019382713, now seen corresponding path program 1 times [2020-10-20 06:33:00,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:00,903 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860711177] [2020-10-20 06:33:00,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:00,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-10-20 06:33:00,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:33:00,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:00,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:00,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-20 06:33:00,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:01,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-10-20 06:33:01,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:01,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:33:01,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:01,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:01,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:01,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-20 06:33:01,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:01,070 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-10-20 06:33:01,070 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860711177] [2020-10-20 06:33:01,070 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186760554] [2020-10-20 06:33:01,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 06:33:01,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:01,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2020-10-20 06:33:01,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:01,162 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 22 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-10-20 06:33:01,162 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 06:33:01,162 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-10-20 06:33:01,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591954738] [2020-10-20 06:33:01,446 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:01,446 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:01,446 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:01,447 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:01,447 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:01,447 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:01,447 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:01,447 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:01,447 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-10-20 06:33:01,447 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:01,447 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:01,449 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:01,459 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:01,461 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:01,508 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:01,508 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) [2020-10-20 06:33:01,519 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:01,519 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:01,560 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:01,561 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:03,251 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:03,253 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:03,253 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:03,253 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:03,253 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:03,253 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:03,254 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,254 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:03,254 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:03,254 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration5_Loop [2020-10-20 06:33:03,254 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:03,254 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:03,256 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,258 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,259 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:03,311 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:03,312 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) [2020-10-20 06:33:03,319 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:03,321 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:03,321 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:03,321 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:03,321 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:03,321 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:03,322 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:03,322 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 [2020-10-20 06:33:03,328 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) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,361 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:03,363 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:03,363 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:03,363 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:03,363 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:03,363 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:03,363 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:03,364 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:03,365 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) [2020-10-20 06:33:03,388 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,389 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:03,389 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:03,390 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:03,390 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:03,390 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:03,392 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:03,393 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:03,396 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:03,404 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-10-20 06:33:03,404 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) [2020-10-20 06:33:03,416 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:03,417 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:03,417 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:03,417 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#t~ret3) = 1*rec2_#t~ret3 Supporting invariants [] Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:03,441 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:03,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:03,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:03,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 12 conjunts are in the unsatisfiable core [2020-10-20 06:33:03,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:03,518 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:03,525 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:03,529 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:03,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:03,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-20 06:33:03,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:03,752 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-20 06:33:03,753 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 [2020-10-20 06:33:03,753 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 113 states and 157 transitions. cyclomatic complexity: 51 Second operand 11 states. [2020-10-20 06:33:04,231 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. [2020-10-20 06:33:04,232 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 [2020-10-20 06:33:04,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-20 06:33:04,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 52 transitions. [2020-10-20 06:33:04,233 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 24 letters. [2020-10-20 06:33:04,234 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:04,234 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 49 letters. Loop has 24 letters. [2020-10-20 06:33:04,235 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:04,235 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 52 transitions. Stem has 25 letters. Loop has 48 letters. [2020-10-20 06:33:04,236 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:04,236 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 584 states and 903 transitions. [2020-10-20 06:33:04,247 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-10-20 06:33:04,257 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 584 states to 432 states and 649 transitions. [2020-10-20 06:33:04,258 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 140 [2020-10-20 06:33:04,259 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 141 [2020-10-20 06:33:04,259 INFO L73 IsDeterministic]: Start isDeterministic. Operand 432 states and 649 transitions. [2020-10-20 06:33:04,259 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:04,259 INFO L691 BuchiCegarLoop]: Abstraction has 432 states and 649 transitions. [2020-10-20 06:33:04,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states and 649 transitions. [2020-10-20 06:33:04,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 383. [2020-10-20 06:33:04,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 383 states. [2020-10-20 06:33:04,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 534 transitions. [2020-10-20 06:33:04,294 INFO L714 BuchiCegarLoop]: Abstraction has 383 states and 534 transitions. [2020-10-20 06:33:04,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:04,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-20 06:33:04,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-10-20 06:33:04,295 INFO L87 Difference]: Start difference. First operand 383 states and 534 transitions. Second operand 11 states. [2020-10-20 06:33:04,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:04,510 INFO L93 Difference]: Finished difference Result 442 states and 645 transitions. [2020-10-20 06:33:04,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-20 06:33:04,512 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 442 states and 645 transitions. [2020-10-20 06:33:04,521 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-10-20 06:33:04,529 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 442 states to 349 states and 495 transitions. [2020-10-20 06:33:04,530 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 131 [2020-10-20 06:33:04,531 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 135 [2020-10-20 06:33:04,531 INFO L73 IsDeterministic]: Start isDeterministic. Operand 349 states and 495 transitions. [2020-10-20 06:33:04,541 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:04,541 INFO L691 BuchiCegarLoop]: Abstraction has 349 states and 495 transitions. [2020-10-20 06:33:04,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states and 495 transitions. [2020-10-20 06:33:04,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 314. [2020-10-20 06:33:04,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-10-20 06:33:04,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 415 transitions. [2020-10-20 06:33:04,584 INFO L714 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-10-20 06:33:04,584 INFO L594 BuchiCegarLoop]: Abstraction has 314 states and 415 transitions. [2020-10-20 06:33:04,584 INFO L427 BuchiCegarLoop]: ======== Iteration 6============ [2020-10-20 06:33:04,584 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 314 states and 415 transitions. [2020-10-20 06:33:04,587 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 14 [2020-10-20 06:33:04,587 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:04,587 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:04,590 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:04,590 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-20 06:33:04,590 INFO L794 eck$LassoCheckResult]: Stem: 3449#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 3450#L25 call main_#t~ret6 := rec2(main_~x~0);< 3467#rec2ENTRY ~j := #in~j; 3489#L18 assume !(~j <= 0); 3469#L20 call #t~ret3 := rec1(~j - 1);< 3487#rec1ENTRY ~i := #in~i; 3503#L12 assume !(~i <= 0); 3497#L14 call #t~ret0 := rec1(~i - 2);< 3502#rec1ENTRY ~i := #in~i; 3507#L12 assume ~i <= 0;#res := 0; 3561#rec1FINAL assume true; 3558#rec1EXIT >#27#return; 3553#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 3554#rec1ENTRY ~i := #in~i; 3557#L12 assume ~i <= 0;#res := 0; 3556#rec1FINAL assume true; 3552#rec1EXIT >#29#return; 3547#L14-2 call #t~ret2 := rec1(#t~ret1);< 3550#rec1ENTRY ~i := #in~i; 3555#L12 assume ~i <= 0;#res := 0; 3551#rec1FINAL assume true; 3549#rec1EXIT >#31#return; 3545#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 3582#rec1FINAL assume true; 3468#rec1EXIT >#33#return; 3388#L20-1 call #t~ret4 := rec2(#t~ret3);< 3387#rec2ENTRY ~j := #in~j; 3389#L18 assume !(~j <= 0); 3534#L20 call #t~ret3 := rec1(~j - 1);< 3474#rec1ENTRY ~i := #in~i; 3580#L12 assume !(~i <= 0); 3418#L14 call #t~ret0 := rec1(~i - 2);< 3452#rec1ENTRY [2020-10-20 06:33:04,590 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 [2020-10-20 06:33:04,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:04,591 INFO L82 PathProgramCache]: Analyzing trace with hash -744961728, now seen corresponding path program 2 times [2020-10-20 06:33:04,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:04,591 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756091200] [2020-10-20 06:33:04,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:04,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-10-20 06:33:04,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:33:04,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:04,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-20 06:33:04,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:04,715 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-10-20 06:33:04,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756091200] [2020-10-20 06:33:04,716 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466359630] [2020-10-20 06:33:04,716 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) [2020-10-20 06:33:04,743 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-20 06:33:04,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 06:33:04,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2020-10-20 06:33:04,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:04,767 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-10-20 06:33:04,767 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 06:33:04,767 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2020-10-20 06:33:04,767 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689246782] [2020-10-20 06:33:04,768 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-10-20 06:33:04,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:04,768 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2020-10-20 06:33:04,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:04,769 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369749215] [2020-10-20 06:33:04,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:04,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:04,774 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:04,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:04,775 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:04,776 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:04,800 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:04,801 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:04,801 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:04,801 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:04,801 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:04,801 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:04,801 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:04,801 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:04,801 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-10-20 06:33:04,801 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:04,802 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:04,802 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,805 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,810 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,812 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,815 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,817 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:04,849 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:04,849 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) [2020-10-20 06:33:04,858 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:04,858 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 [2020-10-20 06:33:04,861 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:04,861 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) [2020-10-20 06:33:04,899 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:04,899 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) [2020-10-20 06:33:04,951 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:04,951 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 [2020-10-20 06:33:05,054 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:05,056 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:05,056 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:05,057 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:05,057 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:05,057 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:05,057 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,057 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:05,057 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:05,057 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration6_Loop [2020-10-20 06:33:05,057 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:05,057 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:05,058 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,061 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,066 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,068 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,070 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,072 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:05,099 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:05,099 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) [2020-10-20 06:33:05,108 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:05,109 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:05,109 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:05,110 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:05,110 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:05,110 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:05,110 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:05,110 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 [2020-10-20 06:33:05,112 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) [2020-10-20 06:33:05,146 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:05,148 INFO L338 nArgumentSynthesizer]: Template has degree 0. Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,148 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:05,148 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:05,148 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:05,148 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:05,149 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:05,150 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:05,152 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:05,154 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:33:05,154 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) [2020-10-20 06:33:05,158 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:05,158 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:05,158 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:05,158 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:05,191 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:05,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:05,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-10-20 06:33:05,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,270 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,274 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,278 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:05,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,306 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:05,306 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:05,306 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-10-20 06:33:05,390 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. [2020-10-20 06:33:05,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:05,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:05,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-10-20 06:33:05,392 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-10-20 06:33:05,392 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:05,392 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:05,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:05,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-10-20 06:33:05,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,473 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,477 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,480 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:05,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,525 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:05,526 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:05,526 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-10-20 06:33:05,609 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. [2020-10-20 06:33:05,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:05,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:05,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-10-20 06:33:05,611 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 32 letters. Loop has 3 letters. [2020-10-20 06:33:05,611 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:05,612 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:05,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:05,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 18 conjunts are in the unsatisfiable core [2020-10-20 06:33:05,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,688 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,691 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,694 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:05,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:05,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:05,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:05,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:05,736 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-10-20 06:33:05,736 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 314 states and 415 transitions. cyclomatic complexity: 114 Second operand 5 states. [2020-10-20 06:33:05,864 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. [2020-10-20 06:33:05,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:05,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-10-20 06:33:05,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-10-20 06:33:05,866 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-10-20 06:33:05,866 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:05,866 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 35 letters. Loop has 3 letters. [2020-10-20 06:33:05,867 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:05,869 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 6 letters. [2020-10-20 06:33:05,869 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:05,870 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 485 states and 616 transitions. [2020-10-20 06:33:05,878 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 26 [2020-10-20 06:33:05,885 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 485 states to 395 states and 526 transitions. [2020-10-20 06:33:05,885 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 129 [2020-10-20 06:33:05,886 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 136 [2020-10-20 06:33:05,886 INFO L73 IsDeterministic]: Start isDeterministic. Operand 395 states and 526 transitions. [2020-10-20 06:33:05,887 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:05,887 INFO L691 BuchiCegarLoop]: Abstraction has 395 states and 526 transitions. [2020-10-20 06:33:05,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states and 526 transitions. [2020-10-20 06:33:05,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 351. [2020-10-20 06:33:05,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-10-20 06:33:05,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 456 transitions. [2020-10-20 06:33:05,904 INFO L714 BuchiCegarLoop]: Abstraction has 351 states and 456 transitions. [2020-10-20 06:33:05,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:05,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-20 06:33:05,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-10-20 06:33:05,906 INFO L87 Difference]: Start difference. First operand 351 states and 456 transitions. Second operand 10 states. [2020-10-20 06:33:06,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:06,027 INFO L93 Difference]: Finished difference Result 378 states and 513 transitions. [2020-10-20 06:33:06,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-20 06:33:06,028 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 378 states and 513 transitions. [2020-10-20 06:33:06,033 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-10-20 06:33:06,036 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 378 states to 104 states and 142 transitions. [2020-10-20 06:33:06,036 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 98 [2020-10-20 06:33:06,036 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 98 [2020-10-20 06:33:06,037 INFO L73 IsDeterministic]: Start isDeterministic. Operand 104 states and 142 transitions. [2020-10-20 06:33:06,037 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:06,037 INFO L691 BuchiCegarLoop]: Abstraction has 104 states and 142 transitions. [2020-10-20 06:33:06,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states and 142 transitions. [2020-10-20 06:33:06,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 86. [2020-10-20 06:33:06,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-10-20 06:33:06,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 106 transitions. [2020-10-20 06:33:06,044 INFO L714 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-10-20 06:33:06,044 INFO L594 BuchiCegarLoop]: Abstraction has 86 states and 106 transitions. [2020-10-20 06:33:06,045 INFO L427 BuchiCegarLoop]: ======== Iteration 7============ [2020-10-20 06:33:06,045 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 86 states and 106 transitions. [2020-10-20 06:33:06,046 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-10-20 06:33:06,046 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:06,046 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:06,047 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:06,047 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-10-20 06:33:06,047 INFO L794 eck$LassoCheckResult]: Stem: 6181#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 6182#L25 call main_#t~ret6 := rec2(main_~x~0);< 6187#rec2ENTRY ~j := #in~j; 6209#L18 assume !(~j <= 0); 6206#L20 call #t~ret3 := rec1(~j - 1);< 6208#rec1ENTRY ~i := #in~i; 6207#L12 assume !(~i <= 0); 6177#L14 call #t~ret0 := rec1(~i - 2);< 6189#rec1ENTRY ~i := #in~i; 6158#L12 assume !(~i <= 0); 6157#L14 [2020-10-20 06:33:06,048 INFO L796 eck$LassoCheckResult]: Loop: 6157#L14 call #t~ret0 := rec1(~i - 2);< 6156#rec1ENTRY ~i := #in~i; 6158#L12 assume !(~i <= 0); 6157#L14 [2020-10-20 06:33:06,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:06,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1371444593, now seen corresponding path program 3 times [2020-10-20 06:33:06,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:06,049 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470362003] [2020-10-20 06:33:06,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:06,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:06,063 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:06,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:06,067 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:06,071 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:06,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:06,072 INFO L82 PathProgramCache]: Analyzing trace with hash 54781, now seen corresponding path program 4 times [2020-10-20 06:33:06,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:06,073 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018712378] [2020-10-20 06:33:06,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:06,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:06,076 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:06,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:06,085 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:06,086 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:06,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:06,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1318041775, now seen corresponding path program 4 times [2020-10-20 06:33:06,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:06,087 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930898050] [2020-10-20 06:33:06,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:06,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:06,093 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:06,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:06,096 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:06,098 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:06,126 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:06,126 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:06,127 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:06,127 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:06,127 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:06,127 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:06,127 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:06,127 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:06,127 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-10-20 06:33:06,127 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:06,127 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:06,129 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,137 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,139 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,141 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,143 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:06,182 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:06,182 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) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:06,185 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:06,185 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:06,213 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:06,213 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:09,725 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:09,727 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:09,727 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:09,727 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:09,727 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:09,727 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:09,727 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:09,728 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:09,728 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:09,728 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration7_Loop [2020-10-20 06:33:09,728 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:09,728 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:09,729 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:09,735 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:09,737 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:09,739 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:09,741 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:09,774 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:09,775 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 [2020-10-20 06:33:09,780 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:09,781 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:09,781 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:09,781 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:09,781 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:09,782 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:09,783 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:09,783 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:09,785 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:09,787 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-10-20 06:33:09,787 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 [2020-10-20 06:33:09,790 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:09,790 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:09,790 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:09,791 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_~i) = 1*rec1_~i Supporting invariants [] [2020-10-20 06:33:09,810 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:09,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:09,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:09,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-20 06:33:09,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:09,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:09,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:09,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:09,877 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 06:33:09,877 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 3 loop predicates [2020-10-20 06:33:09,877 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 86 states and 106 transitions. cyclomatic complexity: 23 Second operand 4 states. [2020-10-20 06:33:09,920 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. [2020-10-20 06:33:09,921 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 [2020-10-20 06:33:09,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-10-20 06:33:09,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 13 transitions. [2020-10-20 06:33:09,921 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 3 letters. [2020-10-20 06:33:09,922 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:09,922 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 13 letters. Loop has 3 letters. [2020-10-20 06:33:09,922 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:09,922 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 13 transitions. Stem has 10 letters. Loop has 6 letters. [2020-10-20 06:33:09,922 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:09,922 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 100 states and 124 transitions. [2020-10-20 06:33:09,927 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-10-20 06:33:09,928 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 100 states to 94 states and 117 transitions. [2020-10-20 06:33:09,928 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 83 [2020-10-20 06:33:09,929 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 84 [2020-10-20 06:33:09,929 INFO L73 IsDeterministic]: Start isDeterministic. Operand 94 states and 117 transitions. [2020-10-20 06:33:09,929 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:09,929 INFO L691 BuchiCegarLoop]: Abstraction has 94 states and 117 transitions. [2020-10-20 06:33:09,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states and 117 transitions. [2020-10-20 06:33:09,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2020-10-20 06:33:09,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-10-20 06:33:09,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 114 transitions. [2020-10-20 06:33:09,934 INFO L714 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-10-20 06:33:09,934 INFO L594 BuchiCegarLoop]: Abstraction has 92 states and 114 transitions. [2020-10-20 06:33:09,934 INFO L427 BuchiCegarLoop]: ======== Iteration 8============ [2020-10-20 06:33:09,934 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 114 transitions. [2020-10-20 06:33:09,935 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 22 [2020-10-20 06:33:09,935 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-10-20 06:33:09,935 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-10-20 06:33:09,937 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 06:33:09,937 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2020-10-20 06:33:09,938 INFO L794 eck$LassoCheckResult]: Stem: 6438#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 6407#L25 call main_#t~ret6 := rec2(main_~x~0);< 6406#rec2ENTRY ~j := #in~j; 6408#L18 assume !(~j <= 0); 6441#L20 call #t~ret3 := rec1(~j - 1);< 6442#rec1ENTRY ~i := #in~i; 6463#L12 assume !(~i <= 0); 6426#L14 call #t~ret0 := rec1(~i - 2);< 6460#rec1ENTRY ~i := #in~i; 6477#L12 assume !(~i <= 0); 6410#L14 call #t~ret0 := rec1(~i - 2);< 6409#rec1ENTRY ~i := #in~i; 6411#L12 assume ~i <= 0;#res := 0; 6497#rec1FINAL assume true; 6495#rec1EXIT >#27#return; 6419#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6425#rec1ENTRY ~i := #in~i; 6491#L12 assume ~i <= 0;#res := 0; 6490#rec1FINAL assume true; 6468#rec1EXIT >#29#return; 6469#L14-2 call #t~ret2 := rec1(#t~ret1);< 6481#rec1ENTRY ~i := #in~i; 6487#L12 assume ~i <= 0;#res := 0; 6486#rec1FINAL assume true; 6479#rec1EXIT >#31#return; 6478#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 6466#rec1FINAL assume true; 6467#rec1EXIT >#27#return; 6422#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6456#rec1ENTRY [2020-10-20 06:33:09,938 INFO L796 eck$LassoCheckResult]: Loop: 6456#rec1ENTRY ~i := #in~i; 6484#L12 assume !(~i <= 0); 6421#L14 call #t~ret0 := rec1(~i - 2);< 6439#rec1ENTRY ~i := #in~i; 6483#L12 assume !(~i <= 0); 6417#L14 call #t~ret0 := rec1(~i - 2);< 6440#rec1ENTRY ~i := #in~i; 6437#L12 assume ~i <= 0;#res := 0; 6416#rec1FINAL assume true; 6418#rec1EXIT >#27#return; 6419#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6425#rec1ENTRY ~i := #in~i; 6491#L12 assume ~i <= 0;#res := 0; 6490#rec1FINAL assume true; 6468#rec1EXIT >#29#return; 6469#L14-2 call #t~ret2 := rec1(#t~ret1);< 6481#rec1ENTRY ~i := #in~i; 6487#L12 assume ~i <= 0;#res := 0; 6486#rec1FINAL assume true; 6479#rec1EXIT >#31#return; 6478#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 6466#rec1FINAL assume true; 6467#rec1EXIT >#27#return; 6423#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 6456#rec1ENTRY [2020-10-20 06:33:09,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:09,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2020-10-20 06:33:09,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:09,939 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923315247] [2020-10-20 06:33:09,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:09,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:09,946 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:09,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:09,956 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:09,958 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:09,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:09,959 INFO L82 PathProgramCache]: Analyzing trace with hash -165506564, now seen corresponding path program 1 times [2020-10-20 06:33:09,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:09,959 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144413585] [2020-10-20 06:33:09,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:09,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:09,964 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:09,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 06:33:09,968 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 06:33:09,970 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 06:33:09,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:09,970 INFO L82 PathProgramCache]: Analyzing trace with hash 2126813793, now seen corresponding path program 2 times [2020-10-20 06:33:09,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 06:33:09,971 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989864332] [2020-10-20 06:33:09,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 06:33:09,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:10,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:33:10,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:10,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-20 06:33:10,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-10-20 06:33:10,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 06:33:10,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 06:33:10,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-20 06:33:10,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,100 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 24 proven. 29 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2020-10-20 06:33:10,100 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989864332] [2020-10-20 06:33:10,100 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977637348] [2020-10-20 06:33:10,101 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 [2020-10-20 06:33:10,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-20 06:33:10,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 06:33:10,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-20 06:33:10,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:10,149 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 109 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-10-20 06:33:10,149 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 06:33:10,149 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-10-20 06:33:10,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197295753] [2020-10-20 06:33:10,413 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:10,414 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:10,414 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:10,414 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:10,414 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-10-20 06:33:10,414 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:10,414 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:10,414 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:10,414 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-10-20 06:33:10,414 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:10,414 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:10,416 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,418 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,421 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,423 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,430 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,432 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,467 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:10,467 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 [2020-10-20 06:33:10,471 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:10,471 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:10,474 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:10,474 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) [2020-10-20 06:33:10,506 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:10,506 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:10,509 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:10,509 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 [2020-10-20 06:33:10,534 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:10,534 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-10-20 06:33:10,537 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-10-20 06:33:10,537 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 [2020-10-20 06:33:10,560 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-10-20 06:33:10,560 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) [2020-10-20 06:33:10,585 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-10-20 06:33:10,585 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:10,589 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-10-20 06:33:10,609 INFO L210 LassoAnalysis]: Preferences: [2020-10-20 06:33:10,609 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-10-20 06:33:10,609 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-10-20 06:33:10,609 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-10-20 06:33:10,609 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-10-20 06:33:10,609 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:10,609 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-10-20 06:33:10,610 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-10-20 06:33:10,610 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1b.c_Iteration8_Loop [2020-10-20 06:33:10,610 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-10-20 06:33:10,610 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-10-20 06:33:10,610 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,614 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,617 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,623 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,626 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,628 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-10-20 06:33:10,659 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-10-20 06:33:10,660 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) [2020-10-20 06:33:10,668 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:10,670 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:10,670 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:10,670 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:10,670 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:10,670 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:10,671 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:10,671 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:10,673 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) [2020-10-20 06:33:10,697 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-10-20 06:33:10,699 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:10,699 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:10,699 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:10,699 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:10,699 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:10,700 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:10,700 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:10,701 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 [2020-10-20 06:33:10,723 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-10-20 06:33:10,724 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-10-20 06:33:10,724 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-10-20 06:33:10,725 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-10-20 06:33:10,725 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-10-20 06:33:10,725 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-10-20 06:33:10,725 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-10-20 06:33:10,725 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-10-20 06:33:10,727 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-10-20 06:33:10,731 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-10-20 06:33:10,731 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 [2020-10-20 06:33:10,735 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-10-20 06:33:10,735 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-10-20 06:33:10,735 INFO L510 LassoAnalysis]: Proved termination. [2020-10-20 06:33:10,735 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-10-20 06:33:10,756 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-10-20 06:33:10,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:10,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:10,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:10,833 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:10,836 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:10,839 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:10,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:10,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-20 06:33:10,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:11,039 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-20 06:33:11,040 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 [2020-10-20 06:33:11,040 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-10-20 06:33:11,112 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. [2020-10-20 06:33:11,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:11,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-20 06:33:11,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-10-20 06:33:11,117 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-10-20 06:33:11,117 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:11,117 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:11,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:11,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:11,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:11,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:11,197 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:11,199 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:11,202 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:11,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:11,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-20 06:33:11,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:11,376 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-20 06:33:11,376 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 [2020-10-20 06:33:11,376 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-10-20 06:33:11,449 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. [2020-10-20 06:33:11,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2020-10-20 06:33:11,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-20 06:33:11,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-10-20 06:33:11,457 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 24 letters. [2020-10-20 06:33:11,457 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:11,457 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:11,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:11,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:11,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:11,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:11,538 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:11,541 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:11,543 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:11,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:11,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-20 06:33:11,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:11,711 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-20 06:33:11,711 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 [2020-10-20 06:33:11,711 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-10-20 06:33:12,058 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. [2020-10-20 06:33:12,058 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 [2020-10-20 06:33:12,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-20 06:33:12,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 38 transitions. [2020-10-20 06:33:12,059 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 11 states and 38 transitions. Stem has 29 letters. Loop has 24 letters. [2020-10-20 06:33:12,060 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:12,061 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-10-20 06:33:12,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 06:33:12,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:12,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-20 06:33:12,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:12,137 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:12,140 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:12,142 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-10-20 06:33:12,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 06:33:12,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 21 conjunts are in the unsatisfiable core [2020-10-20 06:33:12,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 06:33:12,313 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-10-20 06:33:12,313 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 [2020-10-20 06:33:12,314 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 114 transitions. cyclomatic complexity: 26 Second operand 11 states. [2020-10-20 06:33:12,906 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. [2020-10-20 06:33:12,907 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 [2020-10-20 06:33:12,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-10-20 06:33:12,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 49 transitions. [2020-10-20 06:33:12,908 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 24 letters. [2020-10-20 06:33:12,909 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:12,909 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 53 letters. Loop has 24 letters. [2020-10-20 06:33:12,910 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:12,910 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 15 states and 49 transitions. Stem has 29 letters. Loop has 48 letters. [2020-10-20 06:33:12,911 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-10-20 06:33:12,911 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 409 states and 515 transitions. [2020-10-20 06:33:12,917 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 62 [2020-10-20 06:33:12,921 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 409 states to 253 states and 345 transitions. [2020-10-20 06:33:12,922 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 154 [2020-10-20 06:33:12,922 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 164 [2020-10-20 06:33:12,922 INFO L73 IsDeterministic]: Start isDeterministic. Operand 253 states and 345 transitions. [2020-10-20 06:33:12,923 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-10-20 06:33:12,923 INFO L691 BuchiCegarLoop]: Abstraction has 253 states and 345 transitions. [2020-10-20 06:33:12,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states and 345 transitions. [2020-10-20 06:33:12,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 216. [2020-10-20 06:33:12,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-10-20 06:33:12,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 270 transitions. [2020-10-20 06:33:12,932 INFO L714 BuchiCegarLoop]: Abstraction has 216 states and 270 transitions. [2020-10-20 06:33:12,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 06:33:12,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-20 06:33:12,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-10-20 06:33:12,933 INFO L87 Difference]: Start difference. First operand 216 states and 270 transitions. Second operand 8 states. [2020-10-20 06:33:12,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 06:33:12,983 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-10-20 06:33:12,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-20 06:33:12,984 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 35 states and 37 transitions. [2020-10-20 06:33:12,985 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-10-20 06:33:12,985 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 35 states to 0 states and 0 transitions. [2020-10-20 06:33:12,985 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-10-20 06:33:12,985 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-10-20 06:33:12,985 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-10-20 06:33:12,985 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-10-20 06:33:12,985 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-20 06:33:12,985 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-20 06:33:12,985 INFO L594 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-20 06:33:12,985 INFO L427 BuchiCegarLoop]: ======== Iteration 9============ [2020-10-20 06:33:12,986 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2020-10-20 06:33:12,986 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-10-20 06:33:12,986 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2020-10-20 06:33:12,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 20.10 06:33:12 BoogieIcfgContainer [2020-10-20 06:33:12,994 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-10-20 06:33:12,994 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 06:33:12,994 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 06:33:12,995 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 06:33:12,995 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 06:32:56" (3/4) ... [2020-10-20 06:33:12,999 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-10-20 06:33:12,999 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 06:33:13,002 INFO L168 Benchmark]: Toolchain (without parser) took 16978.38 ms. Allocated memory was 34.6 MB in the beginning and 92.8 MB in the end (delta: 58.2 MB). Free memory was 15.8 MB in the beginning and 10.8 MB in the end (delta: 5.0 MB). Peak memory consumption was 63.2 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:13,003 INFO L168 Benchmark]: CDTParser took 0.36 ms. Allocated memory is still 33.6 MB. Free memory was 11.1 MB in the beginning and 11.0 MB in the end (delta: 84.1 kB). Peak memory consumption was 84.1 kB. Max. memory is 14.3 GB. [2020-10-20 06:33:13,003 INFO L168 Benchmark]: CACSL2BoogieTranslator took 293.41 ms. Allocated memory was 34.6 MB in the beginning and 43.5 MB in the end (delta: 8.9 MB). Free memory was 14.9 MB in the beginning and 26.0 MB in the end (delta: -11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:13,004 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.74 ms. Allocated memory is still 43.5 MB. Free memory was 26.0 MB in the beginning and 24.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.5 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:13,005 INFO L168 Benchmark]: Boogie Preprocessor took 17.84 ms. Allocated memory is still 43.5 MB. Free memory was 24.6 MB in the beginning and 23.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:13,005 INFO L168 Benchmark]: RCFGBuilder took 237.91 ms. Allocated memory was 43.5 MB in the beginning and 45.1 MB in the end (delta: 1.6 MB). Free memory was 23.4 MB in the beginning and 24.5 MB in the end (delta: -1.1 MB). Peak memory consumption was 12.0 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:13,006 INFO L168 Benchmark]: BuchiAutomizer took 16382.36 ms. Allocated memory was 45.1 MB in the beginning and 92.8 MB in the end (delta: 47.7 MB). Free memory was 24.5 MB in the beginning and 10.8 MB in the end (delta: 13.7 MB). Peak memory consumption was 61.4 MB. Max. memory is 14.3 GB. [2020-10-20 06:33:13,007 INFO L168 Benchmark]: Witness Printer took 5.44 ms. Allocated memory is still 92.8 MB. Free memory is still 10.8 MB. There was no memory consumed. Max. memory is 14.3 GB. [2020-10-20 06:33:13,010 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36 ms. Allocated memory is still 33.6 MB. Free memory was 11.1 MB in the beginning and 11.0 MB in the end (delta: 84.1 kB). Peak memory consumption was 84.1 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 293.41 ms. Allocated memory was 34.6 MB in the beginning and 43.5 MB in the end (delta: 8.9 MB). Free memory was 14.9 MB in the beginning and 26.0 MB in the end (delta: -11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 30.74 ms. Allocated memory is still 43.5 MB. Free memory was 26.0 MB in the beginning and 24.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.5 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 17.84 ms. Allocated memory is still 43.5 MB. Free memory was 24.6 MB in the beginning and 23.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 14.3 GB. * RCFGBuilder took 237.91 ms. Allocated memory was 43.5 MB in the beginning and 45.1 MB in the end (delta: 1.6 MB). Free memory was 23.4 MB in the beginning and 24.5 MB in the end (delta: -1.1 MB). Peak memory consumption was 12.0 MB. Max. memory is 14.3 GB. * BuchiAutomizer took 16382.36 ms. Allocated memory was 45.1 MB in the beginning and 92.8 MB in the end (delta: 47.7 MB). Free memory was 24.5 MB in the beginning and 10.8 MB in the end (delta: 13.7 MB). Peak memory consumption was 61.4 MB. Max. memory is 14.3 GB. * Witness Printer took 5.44 ms. Allocated memory is still 92.8 MB. Free memory is still 10.8 MB. There was no memory consumed. Max. memory is 14.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: Constructed decomposition of program Your program was decomposed into 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@4d1ce781 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 16.3s and 9 iterations. TraceHistogramMax:5. Analysis of lassos took 10.3s. Construction of modules took 1.0s. Büchi inclusion checks took 4.3s. Highest rank in rank-based complementation 3. Minimization of det autom 1. Minimization of nondet autom 11. Automata minimization 0.1s AutomataMinimizationTime, 11 MinimizatonAttempts, 249 StatesRemovedByMinimization, 11 NontrivialMinimizations. Non-live state removal took 0.1s Buchi closure took 0.0s. Biggest automaton had 314 states and ocurred in iteration 5. Nontrivial modules had stage [5, 0, 1, 1, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 38/58 HoareTripleCheckerStatistics: 288 SDtfs, 338 SDslu, 505 SDs, 0 SdLazy, 952 SolverSat, 325 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.0s 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: 5.8s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...