./Ultimate.py --spec ../../sv-benchmarks/c/properties/termination.prp --file ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for termination Using default analysis Version cad46833 Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/config/AutomizerTermination.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c -s /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(F end) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 0837a1e1d82be1b28ccf3514392f1b01c88a9160 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.24-cad4683 [2019-10-22 08:54:12,153 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-22 08:54:12,154 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-22 08:54:12,163 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-22 08:54:12,164 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-22 08:54:12,164 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-22 08:54:12,165 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-22 08:54:12,167 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-22 08:54:12,168 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-22 08:54:12,169 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-22 08:54:12,170 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-22 08:54:12,171 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-22 08:54:12,171 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-22 08:54:12,172 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-22 08:54:12,172 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-22 08:54:12,173 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-22 08:54:12,174 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-22 08:54:12,175 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-22 08:54:12,176 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-22 08:54:12,178 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-22 08:54:12,179 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-22 08:54:12,180 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-22 08:54:12,181 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-22 08:54:12,181 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-22 08:54:12,183 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-22 08:54:12,184 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-22 08:54:12,184 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-22 08:54:12,185 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-22 08:54:12,185 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-22 08:54:12,186 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-22 08:54:12,186 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-22 08:54:12,187 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-22 08:54:12,190 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-22 08:54:12,191 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-22 08:54:12,192 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-22 08:54:12,192 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-22 08:54:12,193 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-22 08:54:12,193 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-22 08:54:12,193 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-22 08:54:12,193 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-22 08:54:12,194 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-22 08:54:12,195 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf [2019-10-22 08:54:12,210 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-22 08:54:12,211 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-22 08:54:12,215 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-22 08:54:12,215 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-22 08:54:12,219 INFO L138 SettingsManager]: * Use SBE=true [2019-10-22 08:54:12,220 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2019-10-22 08:54:12,220 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2019-10-22 08:54:12,220 INFO L138 SettingsManager]: * Use old map elimination=false [2019-10-22 08:54:12,220 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2019-10-22 08:54:12,220 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2019-10-22 08:54:12,220 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2019-10-22 08:54:12,221 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-22 08:54:12,221 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-10-22 08:54:12,221 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-22 08:54:12,221 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-22 08:54:12,221 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2019-10-22 08:54:12,221 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2019-10-22 08:54:12,222 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2019-10-22 08:54:12,222 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-22 08:54:12,222 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2019-10-22 08:54:12,222 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-22 08:54:12,222 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2019-10-22 08:54:12,222 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-22 08:54:12,223 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-22 08:54:12,223 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2019-10-22 08:54:12,223 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-22 08:54:12,223 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-22 08:54:12,225 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2019-10-22 08:54:12,225 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2019-10-22 08:54:12,226 INFO L138 SettingsManager]: * TransformationType=MODULO_NEIGHBOR Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0837a1e1d82be1b28ccf3514392f1b01c88a9160 [2019-10-22 08:54:12,255 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-22 08:54:12,268 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-22 08:54:12,271 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-22 08:54:12,272 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-22 08:54:12,273 INFO L275 PluginConnector]: CDTParser initialized [2019-10-22 08:54:12,273 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/../../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c [2019-10-22 08:54:12,325 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/data/595725aa4/bfbebd782e504042a20597de73ca2023/FLAGc0b908922 [2019-10-22 08:54:12,699 INFO L306 CDTParser]: Found 1 translation units. [2019-10-22 08:54:12,700 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c [2019-10-22 08:54:12,706 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/data/595725aa4/bfbebd782e504042a20597de73ca2023/FLAGc0b908922 [2019-10-22 08:54:13,140 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/data/595725aa4/bfbebd782e504042a20597de73ca2023 [2019-10-22 08:54:13,149 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-22 08:54:13,151 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-10-22 08:54:13,152 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-22 08:54:13,152 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-22 08:54:13,156 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-22 08:54:13,157 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,160 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@105cc365 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13, skipping insertion in model container [2019-10-22 08:54:13,160 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,167 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-22 08:54:13,180 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-22 08:54:13,292 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 08:54:13,296 INFO L188 MainTranslator]: Completed pre-run [2019-10-22 08:54:13,365 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 08:54:13,377 INFO L192 MainTranslator]: Completed translation [2019-10-22 08:54:13,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13 WrapperNode [2019-10-22 08:54:13,377 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-22 08:54:13,378 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-10-22 08:54:13,378 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-10-22 08:54:13,378 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-10-22 08:54:13,386 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,390 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,406 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-10-22 08:54:13,407 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-22 08:54:13,407 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-22 08:54:13,407 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-22 08:54:13,415 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,415 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,416 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,416 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,418 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,420 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,420 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... [2019-10-22 08:54:13,422 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-22 08:54:13,422 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-22 08:54:13,422 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-22 08:54:13,422 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-22 08:54:13,423 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:13,483 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2019-10-22 08:54:13,483 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2019-10-22 08:54:13,483 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2019-10-22 08:54:13,483 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2019-10-22 08:54:13,483 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-22 08:54:13,484 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-22 08:54:13,670 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-22 08:54:13,672 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-22 08:54:13,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 08:54:13 BoogieIcfgContainer [2019-10-22 08:54:13,674 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-22 08:54:13,674 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2019-10-22 08:54:13,674 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2019-10-22 08:54:13,690 INFO L275 PluginConnector]: BuchiAutomizer initialized [2019-10-22 08:54:13,691 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2019-10-22 08:54:13,691 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 22.10 08:54:13" (1/3) ... [2019-10-22 08:54:13,692 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@237595a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 22.10 08:54:13, skipping insertion in model container [2019-10-22 08:54:13,692 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2019-10-22 08:54:13,692 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:54:13" (2/3) ... [2019-10-22 08:54:13,693 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@237595a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 22.10 08:54:13, skipping insertion in model container [2019-10-22 08:54:13,693 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2019-10-22 08:54:13,693 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 08:54:13" (3/3) ... [2019-10-22 08:54:13,694 INFO L371 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1d.c [2019-10-22 08:54:13,748 INFO L356 BuchiCegarLoop]: Interprodecural is true [2019-10-22 08:54:13,748 INFO L357 BuchiCegarLoop]: Hoare is false [2019-10-22 08:54:13,748 INFO L358 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2019-10-22 08:54:13,748 INFO L359 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-22 08:54:13,749 INFO L360 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-22 08:54:13,749 INFO L361 BuchiCegarLoop]: Difference is false [2019-10-22 08:54:13,749 INFO L362 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-22 08:54:13,749 INFO L365 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2019-10-22 08:54:13,770 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2019-10-22 08:54:13,801 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:13,802 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-10-22 08:54:13,802 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-10-22 08:54:13,812 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2019-10-22 08:54:13,813 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:13,813 INFO L424 BuchiCegarLoop]: ======== Iteration 1============ [2019-10-22 08:54:13,813 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2019-10-22 08:54:13,815 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:13,815 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-10-22 08:54:13,816 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-10-22 08:54:13,816 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2019-10-22 08:54:13,817 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:13,825 INFO L791 eck$LassoCheckResult]: Stem: 13#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 22#L25true call main_#t~ret6 := rec2(main_~x~0);< 3#rec2ENTRYtrue [2019-10-22 08:54:13,825 INFO L793 eck$LassoCheckResult]: Loop: 3#rec2ENTRYtrue ~j := #in~j; 20#L18true assume !(~j <= 0); 18#L20true call #t~ret3 := rec1(~j);< 4#rec1ENTRYtrue ~i := #in~i; 9#L12true assume ~i <= 0;#res := 0; 5#rec1FINALtrue assume true; 12#rec1EXITtrue >#33#return; 23#L20-1true call #t~ret4 := rec2(#t~ret3 - 1);< 3#rec2ENTRYtrue [2019-10-22 08:54:13,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:13,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2019-10-22 08:54:13,839 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:13,839 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129724038] [2019-10-22 08:54:13,839 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:13,840 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:13,840 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:13,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:13,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:13,925 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:13,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:13,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2019-10-22 08:54:13,927 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:13,927 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332464004] [2019-10-22 08:54:13,928 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:13,928 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:13,928 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:13,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:14,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:14,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:14,049 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332464004] [2019-10-22 08:54:14,049 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-22 08:54:14,049 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-22 08:54:14,050 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498869936] [2019-10-22 08:54:14,054 INFO L808 eck$LassoCheckResult]: loop already infeasible [2019-10-22 08:54:14,055 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:54:14,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-22 08:54:14,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-22 08:54:14,074 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 5 states. [2019-10-22 08:54:14,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:54:14,162 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2019-10-22 08:54:14,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-22 08:54:14,167 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 25 states and 33 transitions. [2019-10-22 08:54:14,170 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:14,177 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 25 states to 16 states and 22 transitions. [2019-10-22 08:54:14,178 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 16 [2019-10-22 08:54:14,179 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 16 [2019-10-22 08:54:14,179 INFO L73 IsDeterministic]: Start isDeterministic. Operand 16 states and 22 transitions. [2019-10-22 08:54:14,181 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2019-10-22 08:54:14,181 INFO L688 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2019-10-22 08:54:14,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states and 22 transitions. [2019-10-22 08:54:14,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-10-22 08:54:14,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-10-22 08:54:14,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 22 transitions. [2019-10-22 08:54:14,209 INFO L711 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2019-10-22 08:54:14,209 INFO L591 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2019-10-22 08:54:14,209 INFO L424 BuchiCegarLoop]: ======== Iteration 2============ [2019-10-22 08:54:14,209 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 16 states and 22 transitions. [2019-10-22 08:54:14,210 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:14,210 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-10-22 08:54:14,210 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-10-22 08:54:14,211 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2019-10-22 08:54:14,212 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:14,212 INFO L791 eck$LassoCheckResult]: Stem: 77#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 64#L25 call main_#t~ret6 := rec2(main_~x~0);< 63#rec2ENTRY [2019-10-22 08:54:14,212 INFO L793 eck$LassoCheckResult]: Loop: 63#rec2ENTRY ~j := #in~j; 66#L18 assume !(~j <= 0); 71#L20 call #t~ret3 := rec1(~j);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume !(~i <= 0); 68#L14 call #t~ret0 := rec1(~i - 2);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#27#return; 69#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#29#return; 70#L14-2 call #t~ret2 := rec1(#t~ret1);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#31#return; 75#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 76#rec1FINAL assume true; 78#rec1EXIT >#33#return; 65#L20-1 call #t~ret4 := rec2(#t~ret3 - 1);< 63#rec2ENTRY [2019-10-22 08:54:14,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:14,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 2 times [2019-10-22 08:54:14,213 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:14,213 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85382403] [2019-10-22 08:54:14,213 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:14,213 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:14,213 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:14,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:14,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:14,218 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:14,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:14,219 INFO L82 PathProgramCache]: Analyzing trace with hash -616266826, now seen corresponding path program 1 times [2019-10-22 08:54:14,219 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:14,219 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264892655] [2019-10-22 08:54:14,220 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:14,220 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:14,220 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:14,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:14,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:14,251 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:14,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:14,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1277860358, now seen corresponding path program 1 times [2019-10-22 08:54:14,252 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:14,252 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018869865] [2019-10-22 08:54:14,252 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:14,252 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:14,253 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:14,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:14,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:14,293 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:14,601 WARN L191 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2019-10-22 08:54:14,721 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:14,722 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:14,722 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:14,722 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:14,722 INFO L127 ssoRankerPreferences]: Use exernal solver: true [2019-10-22 08:54:14,722 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:14,722 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:14,722 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:14,723 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration2_Loop [2019-10-22 08:54:14,723 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:14,723 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:14,741 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,746 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,749 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,751 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,753 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,791 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:14,792 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:14,803 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:14,804 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:14,810 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:14,811 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_~j=0} Honda state: {rec2_~j=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:14,816 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:14,816 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:14,818 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:14,819 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#t~ret3=0} Honda state: {rec2_#t~ret3=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:14,839 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:14,840 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:14,843 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:14,844 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#res=0} Honda state: {rec2_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:14,858 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:14,859 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:14,864 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:14,864 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#t~ret4=0} Honda state: {rec2_#t~ret4=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:14,871 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:14,871 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:14,884 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-10-22 08:54:14,884 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:14,891 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-10-22 08:54:14,893 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:14,893 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:14,893 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:14,893 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:14,893 INFO L127 ssoRankerPreferences]: Use exernal solver: false [2019-10-22 08:54:14,894 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:14,894 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:14,894 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:14,894 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration2_Loop [2019-10-22 08:54:14,894 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:14,894 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:14,895 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,901 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,905 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,908 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,918 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:14,951 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:14,956 INFO L489 LassoAnalysis]: Using template 'affine'. [2019-10-22 08:54:14,958 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:14,959 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:14,960 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:14,960 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:14,961 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:14,961 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:14,962 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:14,963 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:14,967 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:14,968 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:14,969 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:14,969 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:14,969 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:14,969 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:14,969 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:14,970 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:14,970 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:14,971 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:14,971 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:14,974 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:14,975 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:14,975 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:14,975 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:14,975 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:14,976 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:14,976 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:14,977 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:14,977 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:14,978 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:14,978 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:14,978 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:14,978 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:14,978 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:14,979 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:14,982 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:14,986 INFO L419 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-10-22 08:54:15,002 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2019-10-22 08:54:15,003 INFO L444 ModelExtractionUtils]: 0 out of 3 variables were initially zero. Simplification set additionally 1 variables to zero. [2019-10-22 08:54:15,013 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-10-22 08:54:15,013 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-10-22 08:54:15,013 INFO L510 LassoAnalysis]: Proved termination. [2019-10-22 08:54:15,014 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#in~j) = 1*rec2_#in~j Supporting invariants [] [2019-10-22 08:54:15,015 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-10-22 08:54:15,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:15,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:15,049 INFO L256 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-22 08:54:15,050 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:15,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:15,090 INFO L256 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-22 08:54:15,092 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:15,195 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-10-22 08:54:15,198 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 8 loop predicates [2019-10-22 08:54:15,199 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 16 states and 22 transitions. cyclomatic complexity: 8 Second operand 9 states. [2019-10-22 08:54:15,575 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 16 states and 22 transitions. cyclomatic complexity: 8. Second operand 9 states. Result 101 states and 147 transitions. Complement of second has 42 states. [2019-10-22 08:54:15,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 10 states 1 stem states 8 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:15,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2019-10-22 08:54:15,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 36 transitions. [2019-10-22 08:54:15,580 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 2 letters. Loop has 24 letters. [2019-10-22 08:54:15,581 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:15,582 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 26 letters. Loop has 24 letters. [2019-10-22 08:54:15,582 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:15,582 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 2 letters. Loop has 48 letters. [2019-10-22 08:54:15,583 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:15,583 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 101 states and 147 transitions. [2019-10-22 08:54:15,589 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:15,593 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 101 states to 89 states and 135 transitions. [2019-10-22 08:54:15,593 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 38 [2019-10-22 08:54:15,594 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 41 [2019-10-22 08:54:15,594 INFO L73 IsDeterministic]: Start isDeterministic. Operand 89 states and 135 transitions. [2019-10-22 08:54:15,595 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-10-22 08:54:15,595 INFO L688 BuchiCegarLoop]: Abstraction has 89 states and 135 transitions. [2019-10-22 08:54:15,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states and 135 transitions. [2019-10-22 08:54:15,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 62. [2019-10-22 08:54:15,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-22 08:54:15,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 98 transitions. [2019-10-22 08:54:15,608 INFO L711 BuchiCegarLoop]: Abstraction has 62 states and 98 transitions. [2019-10-22 08:54:15,608 INFO L591 BuchiCegarLoop]: Abstraction has 62 states and 98 transitions. [2019-10-22 08:54:15,609 INFO L424 BuchiCegarLoop]: ======== Iteration 3============ [2019-10-22 08:54:15,609 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 62 states and 98 transitions. [2019-10-22 08:54:15,610 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:15,610 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-10-22 08:54:15,611 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-10-22 08:54:15,611 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:15,611 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2019-10-22 08:54:15,612 INFO L791 eck$LassoCheckResult]: Stem: 375#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 338#L25 call main_#t~ret6 := rec2(main_~x~0);< 337#rec2ENTRY ~j := #in~j; 340#L18 assume !(~j <= 0); 369#L20 call #t~ret3 := rec1(~j);< 382#rec1ENTRY ~i := #in~i; 368#L12 assume !(~i <= 0); 346#L14 call #t~ret0 := rec1(~i - 2);< 343#rec1ENTRY [2019-10-22 08:54:15,612 INFO L793 eck$LassoCheckResult]: Loop: 343#rec1ENTRY ~i := #in~i; 351#L12 assume !(~i <= 0); 344#L14 call #t~ret0 := rec1(~i - 2);< 343#rec1ENTRY [2019-10-22 08:54:15,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:15,612 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2019-10-22 08:54:15,612 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:15,612 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012728378] [2019-10-22 08:54:15,613 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:15,613 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:15,613 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:15,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:15,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:15,623 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:15,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:15,623 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2019-10-22 08:54:15,623 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:15,624 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480824311] [2019-10-22 08:54:15,624 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:15,624 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:15,624 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:15,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:15,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:15,629 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:15,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:15,630 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2019-10-22 08:54:15,630 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:15,630 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584448406] [2019-10-22 08:54:15,630 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:15,630 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:15,631 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:15,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:15,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:15,641 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:15,666 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:15,666 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:15,667 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:15,667 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:15,667 INFO L127 ssoRankerPreferences]: Use exernal solver: true [2019-10-22 08:54:15,667 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:15,667 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:15,667 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:15,667 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration3_Loop [2019-10-22 08:54:15,667 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:15,668 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:15,668 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,671 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,673 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,675 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,677 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,683 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,713 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:15,713 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:15,721 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:15,721 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:15,725 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:15,725 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret0=0} Honda state: {rec1_#t~ret0=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:15,732 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:15,733 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:15,737 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:15,737 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#res=0} Honda state: {rec1_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:15,761 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:15,761 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:15,766 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:15,766 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret1=0} Honda state: {rec1_#t~ret1=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:15,776 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:15,776 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:15,780 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:15,780 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:15,789 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:15,789 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:15,802 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-10-22 08:54:15,802 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 [2019-10-22 08:54:15,854 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-10-22 08:54:15,857 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:15,857 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:15,857 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:15,857 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:15,857 INFO L127 ssoRankerPreferences]: Use exernal solver: false [2019-10-22 08:54:15,857 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:15,857 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:15,858 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:15,858 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration3_Loop [2019-10-22 08:54:15,858 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:15,858 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:15,859 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,867 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,869 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,872 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,879 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,881 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:15,913 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:15,913 INFO L489 LassoAnalysis]: Using template 'affine'. [2019-10-22 08:54:15,913 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:15,914 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:15,914 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:15,914 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:15,915 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:15,915 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:15,915 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:15,915 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:15,917 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:15,917 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:15,918 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:15,918 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:15,918 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:15,918 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:15,918 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:15,918 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:15,919 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:15,921 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:15,921 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:15,922 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:15,922 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:15,922 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:15,922 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:15,922 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:15,923 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:15,923 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:15,924 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:15,924 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:15,925 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:15,925 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:15,925 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:15,925 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:15,925 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:15,926 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:15,926 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:15,931 INFO L419 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-10-22 08:54:15,942 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-10-22 08:54:15,942 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. [2019-10-22 08:54:15,942 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-10-22 08:54:15,942 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-10-22 08:54:15,943 INFO L510 LassoAnalysis]: Proved termination. [2019-10-22 08:54:15,943 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2019-10-22 08:54:15,943 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-10-22 08:54:15,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:15,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:15,974 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-22 08:54:15,975 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:15,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:15,983 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:15,984 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:15,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:16,000 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 3 loop predicates [2019-10-22 08:54:16,000 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 62 states and 98 transitions. cyclomatic complexity: 40 Second operand 4 states. [2019-10-22 08:54:16,050 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 62 states and 98 transitions. cyclomatic complexity: 40. Second operand 4 states. Result 108 states and 165 transitions. Complement of second has 13 states. [2019-10-22 08:54:16,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:16,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2019-10-22 08:54:16,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 13 transitions. [2019-10-22 08:54:16,052 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 8 letters. Loop has 3 letters. [2019-10-22 08:54:16,052 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:16,052 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 11 letters. Loop has 3 letters. [2019-10-22 08:54:16,052 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:16,052 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 8 letters. Loop has 6 letters. [2019-10-22 08:54:16,053 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:16,053 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 108 states and 165 transitions. [2019-10-22 08:54:16,056 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:16,060 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 108 states to 96 states and 153 transitions. [2019-10-22 08:54:16,060 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 40 [2019-10-22 08:54:16,060 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 42 [2019-10-22 08:54:16,060 INFO L73 IsDeterministic]: Start isDeterministic. Operand 96 states and 153 transitions. [2019-10-22 08:54:16,061 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-10-22 08:54:16,061 INFO L688 BuchiCegarLoop]: Abstraction has 96 states and 153 transitions. [2019-10-22 08:54:16,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states and 153 transitions. [2019-10-22 08:54:16,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2019-10-22 08:54:16,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-22 08:54:16,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 143 transitions. [2019-10-22 08:54:16,070 INFO L711 BuchiCegarLoop]: Abstraction has 92 states and 143 transitions. [2019-10-22 08:54:16,070 INFO L591 BuchiCegarLoop]: Abstraction has 92 states and 143 transitions. [2019-10-22 08:54:16,070 INFO L424 BuchiCegarLoop]: ======== Iteration 4============ [2019-10-22 08:54:16,071 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 143 transitions. [2019-10-22 08:54:16,072 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:16,072 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-10-22 08:54:16,072 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-10-22 08:54:16,073 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:16,073 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2019-10-22 08:54:16,073 INFO L791 eck$LassoCheckResult]: Stem: 617#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 618#L25 call main_#t~ret6 := rec2(main_~x~0);< 621#rec2ENTRY ~j := #in~j; 638#L18 assume !(~j <= 0); 592#L20 call #t~ret3 := rec1(~j);< 630#rec1ENTRY ~i := #in~i; 639#L12 assume !(~i <= 0); 580#L14 call #t~ret0 := rec1(~i - 2);< 579#rec1ENTRY ~i := #in~i; 582#L12 assume ~i <= 0;#res := 0; 641#rec1FINAL assume true; 626#rec1EXIT >#27#return; 591#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 594#rec1ENTRY [2019-10-22 08:54:16,073 INFO L793 eck$LassoCheckResult]: Loop: 594#rec1ENTRY ~i := #in~i; 634#L12 assume !(~i <= 0); 610#L14 call #t~ret0 := rec1(~i - 2);< 594#rec1ENTRY [2019-10-22 08:54:16,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2019-10-22 08:54:16,074 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:16,074 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959591586] [2019-10-22 08:54:16,074 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,074 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,074 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:16,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,084 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:16,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,084 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2019-10-22 08:54:16,084 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:16,084 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906965462] [2019-10-22 08:54:16,085 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,085 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,085 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:16,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,094 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:16,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,096 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2019-10-22 08:54:16,097 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:16,097 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439646508] [2019-10-22 08:54:16,097 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,097 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,097 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:16,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,148 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-22 08:54:16,149 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439646508] [2019-10-22 08:54:16,149 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-22 08:54:16,149 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-22 08:54:16,149 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626530911] [2019-10-22 08:54:16,177 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:16,177 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:16,177 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:16,177 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:16,177 INFO L127 ssoRankerPreferences]: Use exernal solver: true [2019-10-22 08:54:16,177 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,177 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:16,177 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:16,178 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration4_Loop [2019-10-22 08:54:16,178 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:16,178 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:16,179 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,184 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,186 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,188 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,193 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,196 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,226 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:16,226 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:16,234 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:16,234 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 [2019-10-22 08:54:16,238 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:16,238 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#res=0} Honda state: {rec1_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:16,246 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:16,246 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 [2019-10-22 08:54:16,249 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:16,250 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret1=0} Honda state: {rec1_#t~ret1=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:16,256 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:16,256 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 [2019-10-22 08:54:16,259 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:16,259 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,265 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:16,265 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,272 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-10-22 08:54:16,272 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:16,307 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-10-22 08:54:16,308 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:16,308 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:16,308 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:16,308 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:16,308 INFO L127 ssoRankerPreferences]: Use exernal solver: false [2019-10-22 08:54:16,308 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,308 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:16,309 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:16,309 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration4_Loop [2019-10-22 08:54:16,309 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:16,309 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:16,309 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,313 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,315 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,319 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,321 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,322 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,344 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:16,345 INFO L489 LassoAnalysis]: Using template 'affine'. [2019-10-22 08:54:16,345 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:16,346 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:16,346 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:16,346 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:16,346 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:16,346 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:16,347 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:16,347 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:16,348 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:16,348 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:16,348 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:16,349 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:16,349 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:16,349 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:16,349 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:16,349 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:16,349 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:16,350 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:16,350 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:16,351 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:16,351 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:16,351 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:16,352 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:16,352 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:16,352 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:16,353 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:16,355 INFO L419 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-10-22 08:54:16,357 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-10-22 08:54:16,357 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. [2019-10-22 08:54:16,357 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-10-22 08:54:16,357 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-10-22 08:54:16,358 INFO L510 LassoAnalysis]: Proved termination. [2019-10-22 08:54:16,358 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2019-10-22 08:54:16,358 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-10-22 08:54:16,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,390 INFO L256 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-22 08:54:16,392 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:16,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,415 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:16,416 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:16,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:16,437 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2019-10-22 08:54:16,437 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 143 transitions. cyclomatic complexity: 57 Second operand 5 states. [2019-10-22 08:54:16,511 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 143 transitions. cyclomatic complexity: 57. Second operand 5 states. Result 132 states and 207 transitions. Complement of second has 14 states. [2019-10-22 08:54:16,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:16,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-10-22 08:54:16,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2019-10-22 08:54:16,512 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 13 letters. Loop has 3 letters. [2019-10-22 08:54:16,513 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:16,513 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 16 letters. Loop has 3 letters. [2019-10-22 08:54:16,513 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:16,513 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 13 letters. Loop has 6 letters. [2019-10-22 08:54:16,513 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:16,513 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 132 states and 207 transitions. [2019-10-22 08:54:16,517 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:16,520 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 132 states to 120 states and 195 transitions. [2019-10-22 08:54:16,520 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 49 [2019-10-22 08:54:16,520 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 51 [2019-10-22 08:54:16,521 INFO L73 IsDeterministic]: Start isDeterministic. Operand 120 states and 195 transitions. [2019-10-22 08:54:16,521 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-10-22 08:54:16,521 INFO L688 BuchiCegarLoop]: Abstraction has 120 states and 195 transitions. [2019-10-22 08:54:16,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states and 195 transitions. [2019-10-22 08:54:16,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 116. [2019-10-22 08:54:16,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2019-10-22 08:54:16,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 185 transitions. [2019-10-22 08:54:16,531 INFO L711 BuchiCegarLoop]: Abstraction has 116 states and 185 transitions. [2019-10-22 08:54:16,531 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:54:16,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-22 08:54:16,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-22 08:54:16,532 INFO L87 Difference]: Start difference. First operand 116 states and 185 transitions. Second operand 6 states. [2019-10-22 08:54:16,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:54:16,568 INFO L93 Difference]: Finished difference Result 129 states and 195 transitions. [2019-10-22 08:54:16,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-22 08:54:16,569 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 129 states and 195 transitions. [2019-10-22 08:54:16,571 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2019-10-22 08:54:16,574 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 129 states to 127 states and 193 transitions. [2019-10-22 08:54:16,575 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 59 [2019-10-22 08:54:16,575 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 59 [2019-10-22 08:54:16,575 INFO L73 IsDeterministic]: Start isDeterministic. Operand 127 states and 193 transitions. [2019-10-22 08:54:16,575 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-10-22 08:54:16,575 INFO L688 BuchiCegarLoop]: Abstraction has 127 states and 193 transitions. [2019-10-22 08:54:16,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states and 193 transitions. [2019-10-22 08:54:16,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 104. [2019-10-22 08:54:16,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-10-22 08:54:16,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 157 transitions. [2019-10-22 08:54:16,585 INFO L711 BuchiCegarLoop]: Abstraction has 104 states and 157 transitions. [2019-10-22 08:54:16,585 INFO L591 BuchiCegarLoop]: Abstraction has 104 states and 157 transitions. [2019-10-22 08:54:16,586 INFO L424 BuchiCegarLoop]: ======== Iteration 5============ [2019-10-22 08:54:16,586 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 104 states and 157 transitions. [2019-10-22 08:54:16,587 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2019-10-22 08:54:16,587 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-10-22 08:54:16,587 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-10-22 08:54:16,588 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:16,588 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:16,588 INFO L791 eck$LassoCheckResult]: Stem: 1186#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1187#L25 call main_#t~ret6 := rec2(main_~x~0);< 1194#rec2ENTRY ~j := #in~j; 1208#L18 assume !(~j <= 0); 1200#L20 call #t~ret3 := rec1(~j);< 1207#rec1ENTRY ~i := #in~i; 1206#L12 assume !(~i <= 0); 1154#L14 call #t~ret0 := rec1(~i - 2);< 1205#rec1ENTRY ~i := #in~i; 1203#L12 assume !(~i <= 0); 1165#L14 call #t~ret0 := rec1(~i - 2);< 1202#rec1ENTRY ~i := #in~i; 1204#L12 assume ~i <= 0;#res := 0; 1229#rec1FINAL assume true; 1184#rec1EXIT >#27#return; 1147#L14-1 [2019-10-22 08:54:16,588 INFO L793 eck$LassoCheckResult]: Loop: 1147#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1145#rec1ENTRY ~i := #in~i; 1148#L12 assume ~i <= 0;#res := 0; 1221#rec1FINAL assume true; 1215#rec1EXIT >#29#return; 1160#L14-2 call #t~ret2 := rec1(#t~ret1);< 1182#rec1ENTRY ~i := #in~i; 1218#L12 assume !(~i <= 0); 1162#L14 call #t~ret0 := rec1(~i - 2);< 1182#rec1ENTRY ~i := #in~i; 1218#L12 assume ~i <= 0;#res := 0; 1217#rec1FINAL assume true; 1216#rec1EXIT >#27#return; 1147#L14-1 [2019-10-22 08:54:16,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,589 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2019-10-22 08:54:16,589 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:16,589 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974591939] [2019-10-22 08:54:16,589 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,589 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,589 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:16,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,600 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:16,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2019-10-22 08:54:16,601 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:16,601 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293367435] [2019-10-22 08:54:16,601 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,601 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,602 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:16,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,631 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-22 08:54:16,631 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293367435] [2019-10-22 08:54:16,631 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [561917703] [2019-10-22 08:54:16,632 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 08:54:16,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,665 INFO L256 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-22 08:54:16,666 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:16,669 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:16,669 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-22 08:54:16,669 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2019-10-22 08:54:16,670 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396589015] [2019-10-22 08:54:16,670 INFO L808 eck$LassoCheckResult]: loop already infeasible [2019-10-22 08:54:16,670 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:54:16,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-22 08:54:16,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-22 08:54:16,670 INFO L87 Difference]: Start difference. First operand 104 states and 157 transitions. cyclomatic complexity: 59 Second operand 6 states. [2019-10-22 08:54:16,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:54:16,720 INFO L93 Difference]: Finished difference Result 119 states and 173 transitions. [2019-10-22 08:54:16,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-22 08:54:16,721 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 119 states and 173 transitions. [2019-10-22 08:54:16,723 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:16,725 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 119 states to 114 states and 164 transitions. [2019-10-22 08:54:16,726 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 50 [2019-10-22 08:54:16,726 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2019-10-22 08:54:16,726 INFO L73 IsDeterministic]: Start isDeterministic. Operand 114 states and 164 transitions. [2019-10-22 08:54:16,726 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-10-22 08:54:16,726 INFO L688 BuchiCegarLoop]: Abstraction has 114 states and 164 transitions. [2019-10-22 08:54:16,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states and 164 transitions. [2019-10-22 08:54:16,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2019-10-22 08:54:16,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-10-22 08:54:16,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 161 transitions. [2019-10-22 08:54:16,736 INFO L711 BuchiCegarLoop]: Abstraction has 111 states and 161 transitions. [2019-10-22 08:54:16,736 INFO L591 BuchiCegarLoop]: Abstraction has 111 states and 161 transitions. [2019-10-22 08:54:16,736 INFO L424 BuchiCegarLoop]: ======== Iteration 6============ [2019-10-22 08:54:16,736 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 111 states and 161 transitions. [2019-10-22 08:54:16,737 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2019-10-22 08:54:16,737 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-10-22 08:54:16,737 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-10-22 08:54:16,738 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:16,738 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2019-10-22 08:54:16,738 INFO L791 eck$LassoCheckResult]: Stem: 1471#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1472#L25 call main_#t~ret6 := rec2(main_~x~0);< 1479#rec2ENTRY ~j := #in~j; 1501#L18 assume !(~j <= 0); 1481#L20 call #t~ret3 := rec1(~j);< 1494#rec1ENTRY ~i := #in~i; 1491#L12 assume !(~i <= 0); 1440#L14 call #t~ret0 := rec1(~i - 2);< 1488#rec1ENTRY ~i := #in~i; 1486#L12 assume !(~i <= 0); 1437#L14 call #t~ret0 := rec1(~i - 2);< 1485#rec1ENTRY ~i := #in~i; 1487#L12 assume ~i <= 0;#res := 0; 1505#rec1FINAL assume true; 1496#rec1EXIT >#27#return; 1448#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1449#rec1ENTRY ~i := #in~i; 1508#L12 assume ~i <= 0;#res := 0; 1507#rec1FINAL assume true; 1506#rec1EXIT >#29#return; 1428#L14-2 call #t~ret2 := rec1(#t~ret1);< 1427#rec1ENTRY ~i := #in~i; 1429#L12 assume ~i <= 0;#res := 0; 1465#rec1FINAL assume true; 1467#rec1EXIT >#31#return; 1454#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 1434#rec1FINAL assume true; 1444#rec1EXIT >#27#return; 1441#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1474#rec1ENTRY [2019-10-22 08:54:16,738 INFO L793 eck$LassoCheckResult]: Loop: 1474#rec1ENTRY ~i := #in~i; 1504#L12 assume !(~i <= 0); 1438#L14 call #t~ret0 := rec1(~i - 2);< 1474#rec1ENTRY [2019-10-22 08:54:16,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2019-10-22 08:54:16,739 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:16,739 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557710361] [2019-10-22 08:54:16,739 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,739 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,739 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:16,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,754 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:16,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,754 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2019-10-22 08:54:16,755 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:16,755 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525774182] [2019-10-22 08:54:16,755 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,755 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,755 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:16,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:16,759 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:16,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:16,759 INFO L82 PathProgramCache]: Analyzing trace with hash -2050992272, now seen corresponding path program 2 times [2019-10-22 08:54:16,760 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:16,760 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174496230] [2019-10-22 08:54:16,760 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,760 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:16,760 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:16,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:16,848 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-22 08:54:16,849 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174496230] [2019-10-22 08:54:16,849 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283868941] [2019-10-22 08:54:16,849 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 08:54:16,880 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-22 08:54:16,880 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 08:54:16,881 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:16,882 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:16,888 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-22 08:54:16,888 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 08:54:16,888 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2019-10-22 08:54:16,889 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701954312] [2019-10-22 08:54:16,910 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:16,910 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:16,910 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:16,910 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:16,910 INFO L127 ssoRankerPreferences]: Use exernal solver: true [2019-10-22 08:54:16,910 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,910 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:16,910 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:16,910 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration6_Loop [2019-10-22 08:54:16,910 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:16,910 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:16,911 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,913 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,915 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,916 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,921 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,922 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,949 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:16,949 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,954 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:16,954 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:16,956 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:16,956 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret2=0} Honda state: {rec1_#t~ret2=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,960 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:16,961 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:16,962 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:16,963 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#res=0} Honda state: {rec1_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,967 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:16,967 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:16,969 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:16,969 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,973 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:16,974 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,982 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-10-22 08:54:16,982 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:16,986 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-10-22 08:54:16,989 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:16,990 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:16,990 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:16,990 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:16,990 INFO L127 ssoRankerPreferences]: Use exernal solver: false [2019-10-22 08:54:16,990 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:16,990 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:16,990 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:16,990 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration6_Loop [2019-10-22 08:54:16,990 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:16,990 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:16,991 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,993 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:16,997 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,001 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,002 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,003 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,020 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:17,020 INFO L489 LassoAnalysis]: Using template 'affine'. [2019-10-22 08:54:17,020 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:17,021 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:17,021 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:17,021 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:17,021 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:17,021 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:17,021 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:17,022 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:17,022 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:17,023 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:17,023 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:17,023 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:17,023 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:17,024 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:17,024 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:17,024 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:17,024 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:17,025 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:17,025 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:17,026 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:17,026 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:17,026 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:17,026 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:17,026 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:17,026 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:17,027 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:17,029 INFO L419 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-10-22 08:54:17,030 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-10-22 08:54:17,030 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. [2019-10-22 08:54:17,031 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-10-22 08:54:17,031 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-10-22 08:54:17,031 INFO L510 LassoAnalysis]: Proved termination. [2019-10-22 08:54:17,031 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2019-10-22 08:54:17,032 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-10-22 08:54:17,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:17,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,072 INFO L256 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-22 08:54:17,073 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:17,088 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,093 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,096 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:17,114 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:17,126 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:17,127 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2019-10-22 08:54:17,127 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2019-10-22 08:54:17,171 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 128 states and 179 transitions. Complement of second has 7 states. [2019-10-22 08:54:17,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:17,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-10-22 08:54:17,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2019-10-22 08:54:17,172 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 3 letters. [2019-10-22 08:54:17,173 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:17,173 INFO L642 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2019-10-22 08:54:17,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:17,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,245 INFO L256 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-22 08:54:17,246 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:17,267 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,272 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,276 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,291 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:17,291 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:17,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:17,310 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 3 loop predicates [2019-10-22 08:54:17,310 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2019-10-22 08:54:17,355 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 128 states and 179 transitions. Complement of second has 7 states. [2019-10-22 08:54:17,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:17,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-10-22 08:54:17,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2019-10-22 08:54:17,356 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 3 letters. [2019-10-22 08:54:17,357 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:17,357 INFO L642 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2019-10-22 08:54:17,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:17,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,399 INFO L256 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-22 08:54:17,401 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:17,416 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,418 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,421 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:17,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,428 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:17,428 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:17,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:17,444 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2019-10-22 08:54:17,445 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2019-10-22 08:54:17,526 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 156 states and 218 transitions. Complement of second has 13 states. [2019-10-22 08:54:17,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:17,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-10-22 08:54:17,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2019-10-22 08:54:17,527 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 3 letters. [2019-10-22 08:54:17,528 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:17,528 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2019-10-22 08:54:17,528 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:17,528 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 6 letters. [2019-10-22 08:54:17,529 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:17,529 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 156 states and 218 transitions. [2019-10-22 08:54:17,531 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 15 [2019-10-22 08:54:17,533 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 156 states to 138 states and 200 transitions. [2019-10-22 08:54:17,534 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 54 [2019-10-22 08:54:17,534 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 57 [2019-10-22 08:54:17,534 INFO L73 IsDeterministic]: Start isDeterministic. Operand 138 states and 200 transitions. [2019-10-22 08:54:17,534 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-10-22 08:54:17,534 INFO L688 BuchiCegarLoop]: Abstraction has 138 states and 200 transitions. [2019-10-22 08:54:17,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states and 200 transitions. [2019-10-22 08:54:17,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 119. [2019-10-22 08:54:17,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-10-22 08:54:17,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 169 transitions. [2019-10-22 08:54:17,543 INFO L711 BuchiCegarLoop]: Abstraction has 119 states and 169 transitions. [2019-10-22 08:54:17,544 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:54:17,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-22 08:54:17,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2019-10-22 08:54:17,544 INFO L87 Difference]: Start difference. First operand 119 states and 169 transitions. Second operand 8 states. [2019-10-22 08:54:17,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:54:17,590 INFO L93 Difference]: Finished difference Result 97 states and 115 transitions. [2019-10-22 08:54:17,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-22 08:54:17,591 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 97 states and 115 transitions. [2019-10-22 08:54:17,592 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2019-10-22 08:54:17,593 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 97 states to 62 states and 74 transitions. [2019-10-22 08:54:17,593 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 11 [2019-10-22 08:54:17,593 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 11 [2019-10-22 08:54:17,593 INFO L73 IsDeterministic]: Start isDeterministic. Operand 62 states and 74 transitions. [2019-10-22 08:54:17,593 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2019-10-22 08:54:17,593 INFO L688 BuchiCegarLoop]: Abstraction has 62 states and 74 transitions. [2019-10-22 08:54:17,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states and 74 transitions. [2019-10-22 08:54:17,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2019-10-22 08:54:17,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-22 08:54:17,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2019-10-22 08:54:17,609 INFO L711 BuchiCegarLoop]: Abstraction has 53 states and 64 transitions. [2019-10-22 08:54:17,609 INFO L591 BuchiCegarLoop]: Abstraction has 53 states and 64 transitions. [2019-10-22 08:54:17,609 INFO L424 BuchiCegarLoop]: ======== Iteration 7============ [2019-10-22 08:54:17,609 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 53 states and 64 transitions. [2019-10-22 08:54:17,609 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2019-10-22 08:54:17,609 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2019-10-22 08:54:17,609 INFO L119 BuchiIsEmpty]: Starting construction of run [2019-10-22 08:54:17,610 INFO L849 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:54:17,610 INFO L850 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2019-10-22 08:54:17,610 INFO L791 eck$LassoCheckResult]: Stem: 2675#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 2650#L25 call main_#t~ret6 := rec2(main_~x~0);< 2649#rec2ENTRY ~j := #in~j; 2651#L18 assume !(~j <= 0); 2679#L20 call #t~ret3 := rec1(~j);< 2690#rec1ENTRY ~i := #in~i; 2691#L12 assume !(~i <= 0); 2669#L14 call #t~ret0 := rec1(~i - 2);< 2688#rec1ENTRY ~i := #in~i; 2698#L12 assume ~i <= 0;#res := 0; 2701#rec1FINAL assume true; 2687#rec1EXIT >#27#return; 2661#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 2660#rec1ENTRY ~i := #in~i; 2663#L12 assume ~i <= 0;#res := 0; 2664#rec1FINAL assume true; 2665#rec1EXIT >#29#return; 2684#L14-2 call #t~ret2 := rec1(#t~ret1);< 2673#rec1ENTRY ~i := #in~i; 2686#L12 assume ~i <= 0;#res := 0; 2685#rec1FINAL assume true; 2683#rec1EXIT >#31#return; 2682#L14-3 #res := 1 + #t~ret2;havoc #t~ret0;havoc #t~ret2;havoc #t~ret1; 2681#rec1FINAL assume true; 2680#rec1EXIT >#33#return; 2653#L20-1 call #t~ret4 := rec2(#t~ret3 - 1);< 2652#rec2ENTRY ~j := #in~j; 2655#L18 assume !(~j <= 0); 2659#L20 call #t~ret3 := rec1(~j);< 2656#rec1ENTRY [2019-10-22 08:54:17,610 INFO L793 eck$LassoCheckResult]: Loop: 2656#rec1ENTRY ~i := #in~i; 2658#L12 assume !(~i <= 0); 2657#L14 call #t~ret0 := rec1(~i - 2);< 2656#rec1ENTRY [2019-10-22 08:54:17,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:17,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1852176490, now seen corresponding path program 2 times [2019-10-22 08:54:17,611 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:17,611 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062597506] [2019-10-22 08:54:17,611 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:17,611 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:17,611 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:17,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,686 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-10-22 08:54:17,687 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062597506] [2019-10-22 08:54:17,687 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744596242] [2019-10-22 08:54:17,687 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 08:54:17,725 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-22 08:54:17,725 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 08:54:17,726 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:17,727 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:17,733 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-10-22 08:54:17,734 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 08:54:17,735 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2019-10-22 08:54:17,735 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307132035] [2019-10-22 08:54:17,736 INFO L796 eck$LassoCheckResult]: stem already infeasible [2019-10-22 08:54:17,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:17,737 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 4 times [2019-10-22 08:54:17,737 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:54:17,737 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088054550] [2019-10-22 08:54:17,737 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:17,737 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:54:17,737 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:54:17,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:17,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:54:17,742 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:54:17,765 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:17,765 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:17,765 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:17,765 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:17,765 INFO L127 ssoRankerPreferences]: Use exernal solver: true [2019-10-22 08:54:17,765 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:17,765 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:17,765 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:17,765 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration7_Loop [2019-10-22 08:54:17,765 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:17,765 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:17,766 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,769 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,771 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,772 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,774 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,778 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,807 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:17,807 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:17,811 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:17,812 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:17,813 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:17,814 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret2=0} Honda state: {rec1_#t~ret2=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:17,817 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:17,818 INFO L160 nArgumentSynthesizer]: Using integer mode. [2019-10-22 08:54:17,820 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:17,821 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret0=0} Honda state: {rec1_#t~ret0=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:17,831 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:17,831 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:17,834 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:17,834 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret1=0} Honda state: {rec1_#t~ret1=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:17,840 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:17,840 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:17,843 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2019-10-22 08:54:17,843 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:17,850 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2019-10-22 08:54:17,851 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_cd078811-d819-4147-8397-0dca5f72cf59/bin/uautomizer/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2019-10-22 08:54:17,859 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2019-10-22 08:54:17,859 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:17,866 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2019-10-22 08:54:17,867 INFO L210 LassoAnalysis]: Preferences: [2019-10-22 08:54:17,868 INFO L124 ssoRankerPreferences]: Compute integeral hull: false [2019-10-22 08:54:17,868 INFO L125 ssoRankerPreferences]: Enable LassoPartitioneer: true [2019-10-22 08:54:17,868 INFO L126 ssoRankerPreferences]: Term annotations enabled: false [2019-10-22 08:54:17,868 INFO L127 ssoRankerPreferences]: Use exernal solver: false [2019-10-22 08:54:17,868 INFO L128 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-10-22 08:54:17,868 INFO L129 ssoRankerPreferences]: Dump SMT script to file: false [2019-10-22 08:54:17,868 INFO L130 ssoRankerPreferences]: Path of dumped script: [2019-10-22 08:54:17,868 INFO L131 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration7_Loop [2019-10-22 08:54:17,868 INFO L132 ssoRankerPreferences]: MapElimAlgo: Frank [2019-10-22 08:54:17,868 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2019-10-22 08:54:17,869 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,877 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,878 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,881 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,883 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,888 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2019-10-22 08:54:17,909 INFO L292 LassoAnalysis]: Preprocessing complete. [2019-10-22 08:54:17,909 INFO L489 LassoAnalysis]: Using template 'affine'. [2019-10-22 08:54:17,910 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:17,910 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:17,910 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:17,911 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:17,911 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:17,911 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:17,911 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:17,911 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:17,912 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:17,912 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:17,912 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:17,912 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:17,913 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:17,913 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:17,913 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:17,913 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:17,913 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:17,917 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:17,917 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:17,918 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:17,918 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:17,918 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:17,918 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:17,918 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:17,919 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:17,919 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:17,919 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:17,920 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:17,920 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:17,920 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:17,920 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:17,920 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:17,920 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:17,921 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:17,921 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:17,921 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. [2019-10-22 08:54:17,921 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2019-10-22 08:54:17,922 INFO L337 nArgumentSynthesizer]: Template has degree 0. [2019-10-22 08:54:17,922 INFO L350 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2019-10-22 08:54:17,922 INFO L202 nArgumentSynthesizer]: 1 stem disjuncts [2019-10-22 08:54:17,922 INFO L203 nArgumentSynthesizer]: 1 loop disjuncts [2019-10-22 08:54:17,922 INFO L204 nArgumentSynthesizer]: 2 template conjuncts. [2019-10-22 08:54:17,923 INFO L400 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2019-10-22 08:54:17,923 INFO L401 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2019-10-22 08:54:17,926 INFO L419 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2019-10-22 08:54:17,930 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2019-10-22 08:54:17,939 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. [2019-10-22 08:54:17,939 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2019-10-22 08:54:17,940 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2019-10-22 08:54:17,940 INFO L510 LassoAnalysis]: Proved termination. [2019-10-22 08:54:17,940 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2019-10-22 08:54:17,940 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2019-10-22 08:54:17,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:17,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:17,983 INFO L256 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-22 08:54:17,984 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:18,000 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,003 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,005 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:18,014 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:18,014 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:18,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:18,031 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2019-10-22 08:54:18,031 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2019-10-22 08:54:18,087 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 63 states and 75 transitions. Complement of second has 13 states. [2019-10-22 08:54:18,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:18,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-10-22 08:54:18,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 10 transitions. [2019-10-22 08:54:18,088 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 10 transitions. Stem has 29 letters. Loop has 3 letters. [2019-10-22 08:54:18,088 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:18,088 INFO L642 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2019-10-22 08:54:18,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:18,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:18,131 INFO L256 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-22 08:54:18,133 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:18,147 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,149 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,151 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:18,160 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:18,160 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:18,176 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:18,177 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 3 loop predicates [2019-10-22 08:54:18,177 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2019-10-22 08:54:18,235 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 63 states and 75 transitions. Complement of second has 13 states. [2019-10-22 08:54:18,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:18,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-10-22 08:54:18,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 10 transitions. [2019-10-22 08:54:18,237 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 10 transitions. Stem has 29 letters. Loop has 3 letters. [2019-10-22 08:54:18,237 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:18,237 INFO L642 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2019-10-22 08:54:18,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:54:18,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:18,287 INFO L256 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-22 08:54:18,289 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:18,307 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,309 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,311 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 08:54:18,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:54:18,332 INFO L256 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-22 08:54:18,332 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:54:18,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:54:18,349 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2019-10-22 08:54:18,349 INFO L72 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2019-10-22 08:54:18,441 INFO L76 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 77 states and 89 transitions. Complement of second has 13 states. [2019-10-22 08:54:18,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2019-10-22 08:54:18,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2019-10-22 08:54:18,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2019-10-22 08:54:18,443 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 3 letters. [2019-10-22 08:54:18,443 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:18,443 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2019-10-22 08:54:18,443 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:18,443 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 6 letters. [2019-10-22 08:54:18,443 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2019-10-22 08:54:18,444 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 77 states and 89 transitions. [2019-10-22 08:54:18,444 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2019-10-22 08:54:18,445 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 77 states to 0 states and 0 transitions. [2019-10-22 08:54:18,445 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2019-10-22 08:54:18,445 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2019-10-22 08:54:18,445 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2019-10-22 08:54:18,445 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2019-10-22 08:54:18,445 INFO L688 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-10-22 08:54:18,445 INFO L711 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-10-22 08:54:18,445 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:54:18,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-22 08:54:18,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2019-10-22 08:54:18,446 INFO L87 Difference]: Start difference. First operand 0 states and 0 transitions. Second operand 8 states. [2019-10-22 08:54:18,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:54:18,446 INFO L93 Difference]: Finished difference Result 0 states and 0 transitions. [2019-10-22 08:54:18,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-22 08:54:18,447 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 0 states and 0 transitions. [2019-10-22 08:54:18,447 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2019-10-22 08:54:18,447 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 0 states to 0 states and 0 transitions. [2019-10-22 08:54:18,447 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2019-10-22 08:54:18,447 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2019-10-22 08:54:18,447 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2019-10-22 08:54:18,447 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2019-10-22 08:54:18,447 INFO L688 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-10-22 08:54:18,447 INFO L711 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-10-22 08:54:18,447 INFO L591 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-10-22 08:54:18,448 INFO L424 BuchiCegarLoop]: ======== Iteration 8============ [2019-10-22 08:54:18,448 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2019-10-22 08:54:18,448 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2019-10-22 08:54:18,448 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2019-10-22 08:54:18,453 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 22.10 08:54:18 BoogieIcfgContainer [2019-10-22 08:54:18,453 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2019-10-22 08:54:18,453 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-10-22 08:54:18,453 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-10-22 08:54:18,454 INFO L275 PluginConnector]: Witness Printer initialized [2019-10-22 08:54:18,454 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 08:54:13" (3/4) ... [2019-10-22 08:54:18,457 INFO L140 WitnessPrinter]: No result that supports witness generation found [2019-10-22 08:54:18,457 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-10-22 08:54:18,459 INFO L168 Benchmark]: Toolchain (without parser) took 5308.79 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 199.8 MB). Free memory was 943.4 MB in the beginning and 938.4 MB in the end (delta: 5.0 MB). Peak memory consumption was 204.8 MB. Max. memory is 11.5 GB. [2019-10-22 08:54:18,459 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 08:54:18,460 INFO L168 Benchmark]: CACSL2BoogieTranslator took 225.54 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 143.7 MB). Free memory was 943.4 MB in the beginning and 1.1 GB in the end (delta: -194.9 MB). Peak memory consumption was 23.4 MB. Max. memory is 11.5 GB. [2019-10-22 08:54:18,460 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.35 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 08:54:18,460 INFO L168 Benchmark]: Boogie Preprocessor took 15.21 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 08:54:18,461 INFO L168 Benchmark]: RCFGBuilder took 251.66 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. [2019-10-22 08:54:18,461 INFO L168 Benchmark]: BuchiAutomizer took 4778.96 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 56.1 MB). Free memory was 1.1 GB in the beginning and 938.4 MB in the end (delta: 183.0 MB). Peak memory consumption was 239.1 MB. Max. memory is 11.5 GB. [2019-10-22 08:54:18,461 INFO L168 Benchmark]: Witness Printer took 4.25 ms. Allocated memory is still 1.2 GB. Free memory is still 938.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 08:54:18,463 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 225.54 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 143.7 MB). Free memory was 943.4 MB in the beginning and 1.1 GB in the end (delta: -194.9 MB). Peak memory consumption was 23.4 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 28.35 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 15.21 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 251.66 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. * BuchiAutomizer took 4778.96 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 56.1 MB). Free memory was 1.1 GB in the beginning and 938.4 MB in the end (delta: 183.0 MB). Peak memory consumption was 239.1 MB. Max. memory is 11.5 GB. * Witness Printer took 4.25 ms. Allocated memory is still 1.2 GB. Free memory is still 938.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: Constructed decomposition of program Your program was decomposed into 10 terminating modules (5 trivial, 3 deterministic, 2 nondeterministic). One deterministic module has affine ranking function \old(j) and consists of 10 locations. One deterministic module has affine ranking function \old(i) and consists of 4 locations. One deterministic module has affine ranking function \old(i) and consists of 5 locations. One nondeterministic module has affine ranking function \old(i) and consists of 5 locations. One nondeterministic module has affine ranking function \old(i) and consists of 5 locations. 5 modules have a trivial ranking function, the largest among these consists of 8 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 4.7s and 8 iterations. TraceHistogramMax:5. Analysis of lassos took 2.3s. Construction of modules took 0.3s. Büchi inclusion checks took 1.6s. Highest rank in rank-based complementation 3. Minimization of det autom 3. Minimization of nondet autom 7. Automata minimization 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 89 StatesRemovedByMinimization, 7 NontrivialMinimizations. Non-live state removal took 0.0s Buchi closure took 0.0s. Biggest automaton had 111 states and ocurred in iteration 5. Nontrivial modules had stage [3, 0, 2, 0, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 22/24 HoareTripleCheckerStatistics: 188 SDtfs, 186 SDslu, 297 SDs, 0 SdLazy, 307 SolverSat, 134 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time LassoAnalysisResults: nont0 unkn0 SFLI2 SFLT2 conc0 concLT2 SILN0 SILU0 SILI0 SILT1 lasso0 LassoPreprocessingBenchmarks: Lassos: inital11 mio100 ax100 hnf100 lsp100 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq151 hnf93 smp100 dnf100 smp100 tf112 neg100 sie111 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 10ms VariablesStem: 0 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 0 MotzkinApplications: 2 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 18 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 5 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 0.3s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...