./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/config/AutomizerTermination.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c -s /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 0.2.0-a4ecdab [2020-11-28 03:05:25,483 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 03:05:25,485 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 03:05:25,540 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 03:05:25,541 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 03:05:25,543 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 03:05:25,545 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 03:05:25,548 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 03:05:25,550 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 03:05:25,551 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 03:05:25,553 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 03:05:25,555 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 03:05:25,555 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 03:05:25,557 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 03:05:25,558 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 03:05:25,560 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 03:05:25,562 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 03:05:25,563 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 03:05:25,565 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 03:05:25,568 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 03:05:25,570 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 03:05:25,572 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 03:05:25,574 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 03:05:25,575 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 03:05:25,579 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 03:05:25,579 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 03:05:25,580 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 03:05:25,581 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 03:05:25,582 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 03:05:25,583 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 03:05:25,583 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 03:05:25,584 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 03:05:25,585 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 03:05:25,587 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 03:05:25,588 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 03:05:25,589 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 03:05:25,590 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 03:05:25,590 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 03:05:25,590 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 03:05:25,591 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 03:05:25,592 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 03:05:25,593 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-11-28 03:05:25,618 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 03:05:25,618 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 03:05:25,619 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 03:05:25,620 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 03:05:25,620 INFO L138 SettingsManager]: * Use SBE=true [2020-11-28 03:05:25,620 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-11-28 03:05:25,620 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-11-28 03:05:25,621 INFO L138 SettingsManager]: * Use old map elimination=false [2020-11-28 03:05:25,621 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-11-28 03:05:25,621 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-11-28 03:05:25,621 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-11-28 03:05:25,622 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 03:05:25,622 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-28 03:05:25,622 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 03:05:25,622 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 03:05:25,623 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-11-28 03:05:25,623 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-11-28 03:05:25,623 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-11-28 03:05:25,623 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 03:05:25,623 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-11-28 03:05:25,624 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 03:05:25,624 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-11-28 03:05:25,624 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 03:05:25,624 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-28 03:05:25,625 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-11-28 03:05:25,625 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 03:05:25,625 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-28 03:05:25,625 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 03:05:25,626 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-11-28 03:05:25,627 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-11-28 03:05:25,627 INFO L138 SettingsManager]: * TransformationType=MODULO_NEIGHBOR WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0837a1e1d82be1b28ccf3514392f1b01c88a9160 [2020-11-28 03:05:25,909 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 03:05:25,937 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 03:05:25,941 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 03:05:25,944 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 03:05:25,945 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 03:05:25,946 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/../../sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c [2020-11-28 03:05:26,039 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/data/8f3cc5f4b/2056d8efb37c4348931836dd4e7b4782/FLAGcf82523e6 [2020-11-28 03:05:26,504 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 03:05:26,504 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/sv-benchmarks/c/termination-crafted/NestedRecursion_1d.c [2020-11-28 03:05:26,515 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/data/8f3cc5f4b/2056d8efb37c4348931836dd4e7b4782/FLAGcf82523e6 [2020-11-28 03:05:26,877 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/data/8f3cc5f4b/2056d8efb37c4348931836dd4e7b4782 [2020-11-28 03:05:26,880 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 03:05:26,882 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 03:05:26,884 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 03:05:26,884 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 03:05:26,887 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 03:05:26,888 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:05:26" (1/1) ... [2020-11-28 03:05:26,891 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ee50ea2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:26, skipping insertion in model container [2020-11-28 03:05:26,891 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:05:26" (1/1) ... [2020-11-28 03:05:26,899 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 03:05:26,913 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 03:05:27,048 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:05:27,052 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 03:05:27,065 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:05:27,081 INFO L208 MainTranslator]: Completed translation [2020-11-28 03:05:27,111 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27 WrapperNode [2020-11-28 03:05:27,112 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 03:05:27,113 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 03:05:27,113 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 03:05:27,114 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 03:05:27,125 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,134 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,149 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 03:05:27,150 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 03:05:27,151 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 03:05:27,151 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 03:05:27,159 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,159 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,160 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,161 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,163 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,165 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,166 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... [2020-11-28 03:05:27,167 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 03:05:27,168 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 03:05:27,169 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 03:05:27,169 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 03:05:27,170 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:27,253 INFO L130 BoogieDeclarations]: Found specification of procedure rec1 [2020-11-28 03:05:27,254 INFO L138 BoogieDeclarations]: Found implementation of procedure rec1 [2020-11-28 03:05:27,255 INFO L130 BoogieDeclarations]: Found specification of procedure rec2 [2020-11-28 03:05:27,256 INFO L138 BoogieDeclarations]: Found implementation of procedure rec2 [2020-11-28 03:05:27,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 03:05:27,257 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 03:05:27,553 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 03:05:27,553 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-11-28 03:05:27,555 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:05:27 BoogieIcfgContainer [2020-11-28 03:05:27,556 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 03:05:27,557 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-11-28 03:05:27,557 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-11-28 03:05:27,561 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-11-28 03:05:27,562 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-28 03:05:27,562 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 28.11 03:05:26" (1/3) ... [2020-11-28 03:05:27,564 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@56687513 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 28.11 03:05:27, skipping insertion in model container [2020-11-28 03:05:27,564 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-28 03:05:27,564 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:05:27" (2/3) ... [2020-11-28 03:05:27,565 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@56687513 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 28.11 03:05:27, skipping insertion in model container [2020-11-28 03:05:27,565 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-28 03:05:27,566 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:05:27" (3/3) ... [2020-11-28 03:05:27,567 INFO L373 chiAutomizerObserver]: Analyzing ICFG NestedRecursion_1d.c [2020-11-28 03:05:27,622 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-11-28 03:05:27,622 INFO L360 BuchiCegarLoop]: Hoare is false [2020-11-28 03:05:27,623 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-11-28 03:05:27,623 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 03:05:27,623 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 03:05:27,623 INFO L364 BuchiCegarLoop]: Difference is false [2020-11-28 03:05:27,623 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 03:05:27,624 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-11-28 03:05:27,638 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-11-28 03:05:27,679 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:27,680 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:05:27,680 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:05:27,688 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-28 03:05:27,704 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:27,705 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-11-28 03:05:27,705 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 21 states. [2020-11-28 03:05:27,708 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:27,709 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:05:27,709 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:05:27,710 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-28 03:05:27,710 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:27,718 INFO L794 eck$LassoCheckResult]: Stem: 13#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 22#L25true call main_#t~ret6 := rec2(main_~x~0);< 3#rec2ENTRYtrue [2020-11-28 03:05:27,726 INFO L796 eck$LassoCheckResult]: Loop: 3#rec2ENTRYtrue ~j := #in~j; 20#L18true assume !(~j <= 0); 18#L20true call #t~ret3 := rec1(~j);< 4#rec1ENTRYtrue ~i := #in~i; 9#L12true assume ~i <= 0;#res := 0; 5#rec1FINALtrue assume true; 12#rec1EXITtrue >#33#return; 23#L20-1true call #t~ret4 := rec2(#t~ret3 - 1);< 3#rec2ENTRYtrue [2020-11-28 03:05:27,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:27,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 1 times [2020-11-28 03:05:27,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:27,755 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124859868] [2020-11-28 03:05:27,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:27,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:27,846 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:27,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:27,861 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:27,877 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:27,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:27,879 INFO L82 PathProgramCache]: Analyzing trace with hash -1102838740, now seen corresponding path program 1 times [2020-11-28 03:05:27,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:27,880 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082585456] [2020-11-28 03:05:27,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:27,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:27,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:05:27,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:28,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:28,022 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082585456] [2020-11-28 03:05:28,022 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:05:28,023 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-28 03:05:28,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44466556] [2020-11-28 03:05:28,028 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-11-28 03:05:28,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:05:28,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 03:05:28,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-28 03:05:28,049 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 5 states. [2020-11-28 03:05:28,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:05:28,181 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2020-11-28 03:05:28,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-28 03:05:28,183 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 25 states and 33 transitions. [2020-11-28 03:05:28,188 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:28,195 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 25 states to 16 states and 22 transitions. [2020-11-28 03:05:28,196 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 16 [2020-11-28 03:05:28,197 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 16 [2020-11-28 03:05:28,197 INFO L73 IsDeterministic]: Start isDeterministic. Operand 16 states and 22 transitions. [2020-11-28 03:05:28,199 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-11-28 03:05:28,200 INFO L691 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2020-11-28 03:05:28,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states and 22 transitions. [2020-11-28 03:05:28,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-11-28 03:05:28,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-28 03:05:28,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 22 transitions. [2020-11-28 03:05:28,236 INFO L714 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2020-11-28 03:05:28,236 INFO L594 BuchiCegarLoop]: Abstraction has 16 states and 22 transitions. [2020-11-28 03:05:28,236 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-11-28 03:05:28,236 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 16 states and 22 transitions. [2020-11-28 03:05:28,241 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:28,241 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:05:28,241 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:05:28,243 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-28 03:05:28,243 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:28,243 INFO L794 eck$LassoCheckResult]: Stem: 77#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 64#L25 call main_#t~ret6 := rec2(main_~x~0);< 63#rec2ENTRY [2020-11-28 03:05:28,244 INFO L796 eck$LassoCheckResult]: Loop: 63#rec2ENTRY ~j := #in~j; 66#L18 assume !(~j <= 0); 71#L20 call #t~ret3 := rec1(~j);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume !(~i <= 0); 68#L14 call #t~ret0 := rec1(~i - 2);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#27#return; 69#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#29#return; 70#L14-2 call #t~ret2 := rec1(#t~ret1);< 67#rec1ENTRY ~i := #in~i; 72#L12 assume ~i <= 0;#res := 0; 73#rec1FINAL assume true; 74#rec1EXIT >#31#return; 75#L14-3 #res := 1 + #t~ret2;havoc #t~ret1;havoc #t~ret0;havoc #t~ret2; 76#rec1FINAL assume true; 78#rec1EXIT >#33#return; 65#L20-1 call #t~ret4 := rec2(#t~ret3 - 1);< 63#rec2ENTRY [2020-11-28 03:05:28,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:28,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1617, now seen corresponding path program 2 times [2020-11-28 03:05:28,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:28,245 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777558325] [2020-11-28 03:05:28,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:28,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:28,250 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:28,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:28,253 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:28,255 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:28,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:28,256 INFO L82 PathProgramCache]: Analyzing trace with hash -616266826, now seen corresponding path program 1 times [2020-11-28 03:05:28,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:28,256 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046055227] [2020-11-28 03:05:28,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:28,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:28,287 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:28,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:28,326 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:28,332 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:28,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:28,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1277860358, now seen corresponding path program 1 times [2020-11-28 03:05:28,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:28,334 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005310063] [2020-11-28 03:05:28,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:28,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:28,357 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:28,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:28,373 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:28,378 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:28,737 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 40 [2020-11-28 03:05:28,926 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:28,927 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:28,927 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:28,927 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:28,928 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:05:28,928 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:28,928 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:28,928 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:28,928 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration2_Loop [2020-11-28 03:05:28,929 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:28,929 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:28,946 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:28,955 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:28,958 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:28,961 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:28,963 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:29,009 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:29,010 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:29,020 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:29,020 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:29,038 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:29,038 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_~j=0} Honda state: {rec2_~j=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:29,098 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:29,098 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,105 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:29,105 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#t~ret3=0} Honda state: {rec2_#t~ret3=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:29,146 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:29,146 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,150 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:29,150 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#res=0} Honda state: {rec2_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:29,193 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:29,193 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,197 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:29,197 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec2_#t~ret4=0} Honda state: {rec2_#t~ret4=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:29,241 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:29,242 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/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,279 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:05:29,280 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:29,285 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:05:29,321 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:29,321 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:29,322 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:29,322 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:29,322 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:05:29,322 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,322 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:29,322 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:29,322 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration2_Loop [2020-11-28 03:05:29,323 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:29,323 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:29,324 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:29,335 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:29,340 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:29,348 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:29,363 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:29,426 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:29,431 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:29,438 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:29,440 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:29,441 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:29,441 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:29,441 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:29,442 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:29,444 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:29,444 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,447 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,471 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:29,472 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:29,473 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:29,473 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:29,473 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:29,473 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:29,476 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:29,477 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:29,481 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:29,523 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:29,525 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:29,526 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:29,526 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:29,526 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:29,526 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:29,528 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:29,528 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:29,530 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:29,570 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:29,572 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:29,572 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:29,573 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:29,573 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:29,573 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:29,575 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:29,575 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,584 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:05:29,588 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:05:29,588 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:29,625 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:05:29,625 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:05:29,625 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:05:29,626 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec2_#in~j) = 1*rec2_#in~j Supporting invariants [] [2020-11-28 03:05:29,647 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:05:29,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:29,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:29,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 03:05:29,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:29,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:29,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-28 03:05:29,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:30,042 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-11-28 03:05:30,045 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 8 loop predicates [2020-11-28 03:05:30,046 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 16 states and 22 transitions. cyclomatic complexity: 8 Second operand 9 states. [2020-11-28 03:05:30,636 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 16 states and 22 transitions. cyclomatic complexity: 8. Second operand 9 states. Result 101 states and 147 transitions. Complement of second has 42 states. [2020-11-28 03:05:30,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 10 states 1 stem states 8 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:30,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-28 03:05:30,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 36 transitions. [2020-11-28 03:05:30,643 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 2 letters. Loop has 24 letters. [2020-11-28 03:05:30,645 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:30,645 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 26 letters. Loop has 24 letters. [2020-11-28 03:05:30,646 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:30,646 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 10 states and 36 transitions. Stem has 2 letters. Loop has 48 letters. [2020-11-28 03:05:30,647 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:30,647 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 101 states and 147 transitions. [2020-11-28 03:05:30,665 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:30,678 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 101 states to 89 states and 135 transitions. [2020-11-28 03:05:30,678 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 38 [2020-11-28 03:05:30,679 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 41 [2020-11-28 03:05:30,680 INFO L73 IsDeterministic]: Start isDeterministic. Operand 89 states and 135 transitions. [2020-11-28 03:05:30,682 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:05:30,683 INFO L691 BuchiCegarLoop]: Abstraction has 89 states and 135 transitions. [2020-11-28 03:05:30,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states and 135 transitions. [2020-11-28 03:05:30,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 62. [2020-11-28 03:05:30,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-11-28 03:05:30,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 98 transitions. [2020-11-28 03:05:30,715 INFO L714 BuchiCegarLoop]: Abstraction has 62 states and 98 transitions. [2020-11-28 03:05:30,715 INFO L594 BuchiCegarLoop]: Abstraction has 62 states and 98 transitions. [2020-11-28 03:05:30,718 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-11-28 03:05:30,718 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 62 states and 98 transitions. [2020-11-28 03:05:30,720 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:30,720 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:05:30,721 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:05:30,721 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:30,721 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-28 03:05:30,721 INFO L794 eck$LassoCheckResult]: Stem: 375#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 338#L25 call main_#t~ret6 := rec2(main_~x~0);< 337#rec2ENTRY ~j := #in~j; 340#L18 assume !(~j <= 0); 369#L20 call #t~ret3 := rec1(~j);< 382#rec1ENTRY ~i := #in~i; 368#L12 assume !(~i <= 0); 346#L14 call #t~ret0 := rec1(~i - 2);< 343#rec1ENTRY [2020-11-28 03:05:30,722 INFO L796 eck$LassoCheckResult]: Loop: 343#rec1ENTRY ~i := #in~i; 351#L12 assume !(~i <= 0); 344#L14 call #t~ret0 := rec1(~i - 2);< 343#rec1ENTRY [2020-11-28 03:05:30,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:30,722 INFO L82 PathProgramCache]: Analyzing trace with hash 874549579, now seen corresponding path program 1 times [2020-11-28 03:05:30,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:30,722 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637962996] [2020-11-28 03:05:30,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:30,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:30,733 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:30,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:30,747 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:30,751 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:30,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:30,752 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 1 times [2020-11-28 03:05:30,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:30,752 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071074213] [2020-11-28 03:05:30,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:30,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:30,756 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:30,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:30,759 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:30,760 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:30,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:30,784 INFO L82 PathProgramCache]: Analyzing trace with hash 434890603, now seen corresponding path program 2 times [2020-11-28 03:05:30,784 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:30,784 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477127240] [2020-11-28 03:05:30,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:30,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:30,791 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:30,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:30,797 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:30,798 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:30,846 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:30,846 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:30,846 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:30,846 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:30,847 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:05:30,847 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:30,847 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:30,847 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:30,847 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration3_Loop [2020-11-28 03:05:30,847 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:30,847 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:30,848 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:30,855 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:30,860 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:30,863 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:30,874 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:30,882 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:30,935 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:30,935 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:30,960 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:30,960 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:30,966 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:30,966 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret0=0} Honda state: {rec1_#t~ret0=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:30,989 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:30,989 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:30,992 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:30,992 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#res=0} Honda state: {rec1_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:31,017 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:31,017 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:31,020 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:31,020 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret1=0} Honda state: {rec1_#t~ret1=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:31,073 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:31,073 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:31,076 INFO L437 LassoAnalysis]: Proved nontermination for one component. Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:31,076 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:31,117 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:31,117 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:31,158 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:05:31,159 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:31,253 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:05:31,256 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:31,256 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:31,256 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:31,256 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:31,256 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:05:31,256 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:31,258 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:31,258 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:31,258 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration3_Loop [2020-11-28 03:05:31,258 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:31,258 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:31,260 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,267 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,271 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,275 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,284 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,288 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,329 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:31,330 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:31,333 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:31,335 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:31,335 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:31,335 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:31,335 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:31,336 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:31,336 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:31,337 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:31,338 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:31,363 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:31,364 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:31,364 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:31,364 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:31,365 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:31,365 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:31,368 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:31,368 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:31,369 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:31,396 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:31,397 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:31,397 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:31,397 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:31,397 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:31,398 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:31,398 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:31,398 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:31,400 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:31,428 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:31,441 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:31,442 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:31,442 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:31,442 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:31,442 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:31,449 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:31,449 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:31,453 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:05:31,455 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:05:31,455 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:31,458 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:05:31,458 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:05:31,458 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:05:31,458 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-11-28 03:05:31,478 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:05:31,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:31,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:31,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-28 03:05:31,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:31,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:31,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:31,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:31,580 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:31,581 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 3 loop predicates [2020-11-28 03:05:31,581 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 62 states and 98 transitions. cyclomatic complexity: 40 Second operand 4 states. [2020-11-28 03:05:31,646 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 62 states and 98 transitions. cyclomatic complexity: 40. Second operand 4 states. Result 108 states and 165 transitions. Complement of second has 13 states. [2020-11-28 03:05:31,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:31,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-11-28 03:05:31,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 13 transitions. [2020-11-28 03:05:31,647 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 8 letters. Loop has 3 letters. [2020-11-28 03:05:31,647 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:31,647 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 11 letters. Loop has 3 letters. [2020-11-28 03:05:31,648 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:31,648 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 13 transitions. Stem has 8 letters. Loop has 6 letters. [2020-11-28 03:05:31,648 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:31,648 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 108 states and 165 transitions. [2020-11-28 03:05:31,653 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:31,657 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 108 states to 96 states and 153 transitions. [2020-11-28 03:05:31,657 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 40 [2020-11-28 03:05:31,657 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 42 [2020-11-28 03:05:31,658 INFO L73 IsDeterministic]: Start isDeterministic. Operand 96 states and 153 transitions. [2020-11-28 03:05:31,658 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:05:31,658 INFO L691 BuchiCegarLoop]: Abstraction has 96 states and 153 transitions. [2020-11-28 03:05:31,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states and 153 transitions. [2020-11-28 03:05:31,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2020-11-28 03:05:31,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-11-28 03:05:31,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 143 transitions. [2020-11-28 03:05:31,670 INFO L714 BuchiCegarLoop]: Abstraction has 92 states and 143 transitions. [2020-11-28 03:05:31,670 INFO L594 BuchiCegarLoop]: Abstraction has 92 states and 143 transitions. [2020-11-28 03:05:31,670 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-11-28 03:05:31,670 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 92 states and 143 transitions. [2020-11-28 03:05:31,672 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:31,672 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:05:31,673 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:05:31,673 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:31,673 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-28 03:05:31,673 INFO L794 eck$LassoCheckResult]: Stem: 617#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 618#L25 call main_#t~ret6 := rec2(main_~x~0);< 621#rec2ENTRY ~j := #in~j; 638#L18 assume !(~j <= 0); 592#L20 call #t~ret3 := rec1(~j);< 630#rec1ENTRY ~i := #in~i; 639#L12 assume !(~i <= 0); 580#L14 call #t~ret0 := rec1(~i - 2);< 579#rec1ENTRY ~i := #in~i; 582#L12 assume ~i <= 0;#res := 0; 641#rec1FINAL assume true; 626#rec1EXIT >#27#return; 591#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 594#rec1ENTRY [2020-11-28 03:05:31,674 INFO L796 eck$LassoCheckResult]: Loop: 594#rec1ENTRY ~i := #in~i; 634#L12 assume !(~i <= 0); 610#L14 call #t~ret0 := rec1(~i - 2);< 594#rec1ENTRY [2020-11-28 03:05:31,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:31,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1317996508, now seen corresponding path program 1 times [2020-11-28 03:05:31,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:31,674 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286250215] [2020-11-28 03:05:31,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:31,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:31,680 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:31,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:31,685 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:31,687 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:31,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:31,687 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 2 times [2020-11-28 03:05:31,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:31,688 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533071462] [2020-11-28 03:05:31,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:31,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:31,690 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:31,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:31,692 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:31,693 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:31,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:31,694 INFO L82 PathProgramCache]: Analyzing trace with hash -157050054, now seen corresponding path program 2 times [2020-11-28 03:05:31,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:31,694 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339087563] [2020-11-28 03:05:31,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:31,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:31,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:05:31,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:31,749 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 03:05:31,749 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339087563] [2020-11-28 03:05:31,749 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:05:31,749 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-28 03:05:31,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847657] [2020-11-28 03:05:31,786 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:31,786 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:31,786 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:31,786 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:31,786 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:05:31,786 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:31,786 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:31,786 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:31,786 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration4_Loop [2020-11-28 03:05:31,786 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:31,786 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:31,787 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,790 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,797 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,800 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,806 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,809 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:31,866 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:31,866 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:31,871 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:31,872 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:31,875 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:31,875 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#res=0} Honda state: {rec1_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:31,934 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:31,934 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:31,944 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:31,944 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret1=0} Honda state: {rec1_#t~ret1=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:05:31,972 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:31,972 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:31,975 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:31,975 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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 [2020-11-28 03:05:31,996 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:31,996 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/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) [2020-11-28 03:05:32,050 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:05:32,050 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:32,087 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:05:32,088 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:32,089 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:32,089 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:32,089 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:32,089 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:05:32,089 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:32,089 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:32,089 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:32,089 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration4_Loop [2020-11-28 03:05:32,089 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:32,089 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:32,090 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:32,093 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:32,095 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:32,101 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:32,105 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:32,107 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:32,145 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:32,145 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:32,152 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:32,153 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:32,153 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:32,153 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:32,153 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:32,154 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:32,154 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:32,154 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:32,156 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:32,181 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:32,182 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:32,182 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:32,182 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:32,182 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:32,182 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:32,183 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:32,183 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:32,184 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:32,205 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:32,206 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:32,206 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:32,207 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:32,207 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:32,207 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:32,208 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:32,208 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:32,211 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:05:32,213 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:05:32,213 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:32,215 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:05:32,215 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:05:32,215 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:05:32,215 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-11-28 03:05:32,235 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:05:32,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:32,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:32,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-28 03:05:32,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:32,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:32,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:32,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:32,355 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:32,355 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-11-28 03:05:32,355 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 92 states and 143 transitions. cyclomatic complexity: 57 Second operand 5 states. [2020-11-28 03:05:32,466 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 92 states and 143 transitions. cyclomatic complexity: 57. Second operand 5 states. Result 132 states and 207 transitions. Complement of second has 14 states. [2020-11-28 03:05:32,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:32,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:05:32,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 17 transitions. [2020-11-28 03:05:32,475 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 13 letters. Loop has 3 letters. [2020-11-28 03:05:32,475 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:32,475 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 16 letters. Loop has 3 letters. [2020-11-28 03:05:32,475 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:32,475 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 17 transitions. Stem has 13 letters. Loop has 6 letters. [2020-11-28 03:05:32,476 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:32,476 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 132 states and 207 transitions. [2020-11-28 03:05:32,479 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:32,484 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 132 states to 120 states and 195 transitions. [2020-11-28 03:05:32,484 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 49 [2020-11-28 03:05:32,484 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 51 [2020-11-28 03:05:32,485 INFO L73 IsDeterministic]: Start isDeterministic. Operand 120 states and 195 transitions. [2020-11-28 03:05:32,485 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:05:32,485 INFO L691 BuchiCegarLoop]: Abstraction has 120 states and 195 transitions. [2020-11-28 03:05:32,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states and 195 transitions. [2020-11-28 03:05:32,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 116. [2020-11-28 03:05:32,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-11-28 03:05:32,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 185 transitions. [2020-11-28 03:05:32,505 INFO L714 BuchiCegarLoop]: Abstraction has 116 states and 185 transitions. [2020-11-28 03:05:32,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:05:32,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 03:05:32,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:05:32,506 INFO L87 Difference]: Start difference. First operand 116 states and 185 transitions. Second operand 6 states. [2020-11-28 03:05:32,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:05:32,565 INFO L93 Difference]: Finished difference Result 129 states and 195 transitions. [2020-11-28 03:05:32,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 03:05:32,567 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 129 states and 195 transitions. [2020-11-28 03:05:32,570 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 11 [2020-11-28 03:05:32,575 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 129 states to 127 states and 193 transitions. [2020-11-28 03:05:32,575 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 59 [2020-11-28 03:05:32,575 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 59 [2020-11-28 03:05:32,575 INFO L73 IsDeterministic]: Start isDeterministic. Operand 127 states and 193 transitions. [2020-11-28 03:05:32,575 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:05:32,575 INFO L691 BuchiCegarLoop]: Abstraction has 127 states and 193 transitions. [2020-11-28 03:05:32,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states and 193 transitions. [2020-11-28 03:05:32,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 104. [2020-11-28 03:05:32,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-11-28 03:05:32,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 157 transitions. [2020-11-28 03:05:32,589 INFO L714 BuchiCegarLoop]: Abstraction has 104 states and 157 transitions. [2020-11-28 03:05:32,589 INFO L594 BuchiCegarLoop]: Abstraction has 104 states and 157 transitions. [2020-11-28 03:05:32,589 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-11-28 03:05:32,589 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 104 states and 157 transitions. [2020-11-28 03:05:32,591 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 10 [2020-11-28 03:05:32,591 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:05:32,591 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:05:32,597 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:32,597 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:32,597 INFO L794 eck$LassoCheckResult]: Stem: 1186#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1187#L25 call main_#t~ret6 := rec2(main_~x~0);< 1194#rec2ENTRY ~j := #in~j; 1208#L18 assume !(~j <= 0); 1200#L20 call #t~ret3 := rec1(~j);< 1207#rec1ENTRY ~i := #in~i; 1206#L12 assume !(~i <= 0); 1154#L14 call #t~ret0 := rec1(~i - 2);< 1205#rec1ENTRY ~i := #in~i; 1203#L12 assume !(~i <= 0); 1165#L14 call #t~ret0 := rec1(~i - 2);< 1202#rec1ENTRY ~i := #in~i; 1204#L12 assume ~i <= 0;#res := 0; 1229#rec1FINAL assume true; 1184#rec1EXIT >#27#return; 1147#L14-1 [2020-11-28 03:05:32,597 INFO L796 eck$LassoCheckResult]: Loop: 1147#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1145#rec1ENTRY ~i := #in~i; 1148#L12 assume ~i <= 0;#res := 0; 1221#rec1FINAL assume true; 1215#rec1EXIT >#29#return; 1160#L14-2 call #t~ret2 := rec1(#t~ret1);< 1182#rec1ENTRY ~i := #in~i; 1218#L12 assume !(~i <= 0); 1162#L14 call #t~ret0 := rec1(~i - 2);< 1182#rec1ENTRY ~i := #in~i; 1218#L12 assume ~i <= 0;#res := 0; 1217#rec1FINAL assume true; 1216#rec1EXIT >#27#return; 1147#L14-1 [2020-11-28 03:05:32,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:32,597 INFO L82 PathProgramCache]: Analyzing trace with hash -377207200, now seen corresponding path program 1 times [2020-11-28 03:05:32,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:32,598 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738188233] [2020-11-28 03:05:32,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:32,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:32,604 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:32,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:32,609 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:32,610 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:32,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:32,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1306212703, now seen corresponding path program 1 times [2020-11-28 03:05:32,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:32,611 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129125662] [2020-11-28 03:05:32,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:32,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:32,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:05:32,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:32,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-11-28 03:05:32,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:32,702 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 03:05:32,703 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129125662] [2020-11-28 03:05:32,703 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704142948] [2020-11-28 03:05:32,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:05:32,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:32,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-28 03:05:32,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:32,760 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:32,768 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-11-28 03:05:32,768 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2020-11-28 03:05:32,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896850424] [2020-11-28 03:05:32,774 INFO L811 eck$LassoCheckResult]: loop already infeasible [2020-11-28 03:05:32,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:05:32,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 03:05:32,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:05:32,775 INFO L87 Difference]: Start difference. First operand 104 states and 157 transitions. cyclomatic complexity: 59 Second operand 6 states. [2020-11-28 03:05:32,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:05:32,846 INFO L93 Difference]: Finished difference Result 119 states and 173 transitions. [2020-11-28 03:05:32,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 03:05:32,847 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 119 states and 173 transitions. [2020-11-28 03:05:32,850 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:32,857 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 119 states to 114 states and 164 transitions. [2020-11-28 03:05:32,857 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 50 [2020-11-28 03:05:32,857 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 50 [2020-11-28 03:05:32,857 INFO L73 IsDeterministic]: Start isDeterministic. Operand 114 states and 164 transitions. [2020-11-28 03:05:32,858 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:05:32,858 INFO L691 BuchiCegarLoop]: Abstraction has 114 states and 164 transitions. [2020-11-28 03:05:32,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states and 164 transitions. [2020-11-28 03:05:32,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2020-11-28 03:05:32,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-11-28 03:05:32,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 161 transitions. [2020-11-28 03:05:32,874 INFO L714 BuchiCegarLoop]: Abstraction has 111 states and 161 transitions. [2020-11-28 03:05:32,874 INFO L594 BuchiCegarLoop]: Abstraction has 111 states and 161 transitions. [2020-11-28 03:05:32,874 INFO L427 BuchiCegarLoop]: ======== Iteration 6============ [2020-11-28 03:05:32,874 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 111 states and 161 transitions. [2020-11-28 03:05:32,876 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-28 03:05:32,876 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:05:32,876 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:05:32,877 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [5, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:32,877 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-28 03:05:32,877 INFO L794 eck$LassoCheckResult]: Stem: 1471#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 1472#L25 call main_#t~ret6 := rec2(main_~x~0);< 1479#rec2ENTRY ~j := #in~j; 1501#L18 assume !(~j <= 0); 1481#L20 call #t~ret3 := rec1(~j);< 1494#rec1ENTRY ~i := #in~i; 1491#L12 assume !(~i <= 0); 1440#L14 call #t~ret0 := rec1(~i - 2);< 1488#rec1ENTRY ~i := #in~i; 1486#L12 assume !(~i <= 0); 1437#L14 call #t~ret0 := rec1(~i - 2);< 1485#rec1ENTRY ~i := #in~i; 1487#L12 assume ~i <= 0;#res := 0; 1505#rec1FINAL assume true; 1496#rec1EXIT >#27#return; 1448#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1449#rec1ENTRY ~i := #in~i; 1508#L12 assume ~i <= 0;#res := 0; 1507#rec1FINAL assume true; 1506#rec1EXIT >#29#return; 1428#L14-2 call #t~ret2 := rec1(#t~ret1);< 1427#rec1ENTRY ~i := #in~i; 1429#L12 assume ~i <= 0;#res := 0; 1465#rec1FINAL assume true; 1467#rec1EXIT >#31#return; 1454#L14-3 #res := 1 + #t~ret2;havoc #t~ret1;havoc #t~ret0;havoc #t~ret2; 1434#rec1FINAL assume true; 1444#rec1EXIT >#27#return; 1441#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 1474#rec1ENTRY [2020-11-28 03:05:32,877 INFO L796 eck$LassoCheckResult]: Loop: 1474#rec1ENTRY ~i := #in~i; 1504#L12 assume !(~i <= 0); 1438#L14 call #t~ret0 := rec1(~i - 2);< 1474#rec1ENTRY [2020-11-28 03:05:32,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:32,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1733863270, now seen corresponding path program 1 times [2020-11-28 03:05:32,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:32,878 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825483902] [2020-11-28 03:05:32,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:32,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:32,898 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:32,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:32,916 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:32,924 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:32,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:32,925 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 3 times [2020-11-28 03:05:32,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:32,925 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777641849] [2020-11-28 03:05:32,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:32,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:32,928 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:32,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:32,929 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:32,931 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:32,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:32,932 INFO L82 PathProgramCache]: Analyzing trace with hash -2050992272, now seen corresponding path program 2 times [2020-11-28 03:05:32,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:32,938 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933939081] [2020-11-28 03:05:32,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:32,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:32,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:05:32,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:33,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:05:33,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:33,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:05:33,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:33,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-28 03:05:33,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:33,074 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-11-28 03:05:33,074 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933939081] [2020-11-28 03:05:33,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907994913] [2020-11-28 03:05:33,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:05:33,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 03:05:33,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:05:33,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:33,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:33,155 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-11-28 03:05:33,155 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:05:33,155 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-11-28 03:05:33,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762791964] [2020-11-28 03:05:33,223 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:33,223 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:33,223 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:33,223 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:33,223 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:05:33,223 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,224 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:33,224 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:33,224 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration6_Loop [2020-11-28 03:05:33,224 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:33,224 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:33,224 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,228 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,230 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,232 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,237 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,239 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,284 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:33,284 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,287 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:33,287 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:33,291 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:33,291 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret2=0} Honda state: {rec1_#t~ret2=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,313 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:33,313 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:33,315 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:33,315 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#res=0} Honda state: {rec1_#res=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,338 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:33,338 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:33,340 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:33,340 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,360 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:33,360 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,383 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:05:33,383 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:33,406 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:05:33,407 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:33,407 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:33,407 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:33,407 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:33,407 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:05:33,407 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,408 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:33,408 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:33,408 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration6_Loop [2020-11-28 03:05:33,408 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:33,408 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:33,409 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,418 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,421 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,426 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,428 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,431 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:33,469 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:33,469 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,475 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:33,476 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:33,476 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:33,476 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:33,476 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:33,476 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:33,477 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:33,477 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:33,486 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,507 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:33,509 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:33,509 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:33,509 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:33,509 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:33,510 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:33,510 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:33,510 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:33,511 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,532 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:33,534 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:33,534 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:33,534 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:33,534 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:33,534 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:33,535 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:33,535 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:33,541 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:05:33,545 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:05:33,546 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:05:33,549 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:05:33,549 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:05:33,549 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:05:33,549 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:33,569 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:05:33,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:33,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:33,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:05:33,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:33,737 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:33,742 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:33,755 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:33,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:33,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:33,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:33,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:33,795 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-11-28 03:05:33,795 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2020-11-28 03:05:33,881 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 128 states and 179 transitions. Complement of second has 7 states. [2020-11-28 03:05:33,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:33,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:05:33,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-11-28 03:05:33,882 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 3 letters. [2020-11-28 03:05:33,883 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:33,883 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:05:33,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:33,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:33,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:05:33,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:34,006 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:34,010 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:34,021 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:34,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:34,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:34,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:34,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:34,068 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 3 loop predicates [2020-11-28 03:05:34,068 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2020-11-28 03:05:34,143 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 128 states and 179 transitions. Complement of second has 7 states. [2020-11-28 03:05:34,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 2 stem states 1 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:34,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:05:34,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 15 transitions. [2020-11-28 03:05:34,148 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 15 transitions. Stem has 29 letters. Loop has 3 letters. [2020-11-28 03:05:34,148 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:34,148 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:05:34,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:34,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:34,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:05:34,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:34,245 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:34,248 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:34,260 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:34,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:34,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:34,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:34,303 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:34,304 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-11-28 03:05:34,304 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56 Second operand 5 states. [2020-11-28 03:05:34,465 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 111 states and 161 transitions. cyclomatic complexity: 56. Second operand 5 states. Result 156 states and 218 transitions. Complement of second has 13 states. [2020-11-28 03:05:34,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:34,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:05:34,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-11-28 03:05:34,470 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 3 letters. [2020-11-28 03:05:34,471 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:34,471 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-11-28 03:05:34,471 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:34,471 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 6 letters. [2020-11-28 03:05:34,471 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:34,471 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 156 states and 218 transitions. [2020-11-28 03:05:34,474 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 15 [2020-11-28 03:05:34,486 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 156 states to 138 states and 200 transitions. [2020-11-28 03:05:34,488 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 54 [2020-11-28 03:05:34,489 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 57 [2020-11-28 03:05:34,489 INFO L73 IsDeterministic]: Start isDeterministic. Operand 138 states and 200 transitions. [2020-11-28 03:05:34,489 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:05:34,490 INFO L691 BuchiCegarLoop]: Abstraction has 138 states and 200 transitions. [2020-11-28 03:05:34,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states and 200 transitions. [2020-11-28 03:05:34,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 119. [2020-11-28 03:05:34,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-11-28 03:05:34,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 169 transitions. [2020-11-28 03:05:34,511 INFO L714 BuchiCegarLoop]: Abstraction has 119 states and 169 transitions. [2020-11-28 03:05:34,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:05:34,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 03:05:34,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:05:34,512 INFO L87 Difference]: Start difference. First operand 119 states and 169 transitions. Second operand 8 states. [2020-11-28 03:05:34,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:05:34,586 INFO L93 Difference]: Finished difference Result 97 states and 115 transitions. [2020-11-28 03:05:34,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 03:05:34,586 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 97 states and 115 transitions. [2020-11-28 03:05:34,588 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2020-11-28 03:05:34,588 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 97 states to 62 states and 74 transitions. [2020-11-28 03:05:34,588 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 11 [2020-11-28 03:05:34,589 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 11 [2020-11-28 03:05:34,589 INFO L73 IsDeterministic]: Start isDeterministic. Operand 62 states and 74 transitions. [2020-11-28 03:05:34,589 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-28 03:05:34,589 INFO L691 BuchiCegarLoop]: Abstraction has 62 states and 74 transitions. [2020-11-28 03:05:34,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states and 74 transitions. [2020-11-28 03:05:34,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2020-11-28 03:05:34,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-11-28 03:05:34,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2020-11-28 03:05:34,593 INFO L714 BuchiCegarLoop]: Abstraction has 53 states and 64 transitions. [2020-11-28 03:05:34,593 INFO L594 BuchiCegarLoop]: Abstraction has 53 states and 64 transitions. [2020-11-28 03:05:34,593 INFO L427 BuchiCegarLoop]: ======== Iteration 7============ [2020-11-28 03:05:34,593 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 53 states and 64 transitions. [2020-11-28 03:05:34,594 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2020-11-28 03:05:34,594 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-28 03:05:34,594 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-28 03:05:34,595 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:05:34,595 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-28 03:05:34,595 INFO L794 eck$LassoCheckResult]: Stem: 2675#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet5, main_#t~ret6, main_~x~0;main_~x~0 := main_#t~nondet5;havoc main_#t~nondet5; 2650#L25 call main_#t~ret6 := rec2(main_~x~0);< 2649#rec2ENTRY ~j := #in~j; 2651#L18 assume !(~j <= 0); 2679#L20 call #t~ret3 := rec1(~j);< 2690#rec1ENTRY ~i := #in~i; 2691#L12 assume !(~i <= 0); 2669#L14 call #t~ret0 := rec1(~i - 2);< 2688#rec1ENTRY ~i := #in~i; 2698#L12 assume ~i <= 0;#res := 0; 2701#rec1FINAL assume true; 2687#rec1EXIT >#27#return; 2661#L14-1 call #t~ret1 := rec1(#t~ret0 - 1);< 2660#rec1ENTRY ~i := #in~i; 2663#L12 assume ~i <= 0;#res := 0; 2664#rec1FINAL assume true; 2665#rec1EXIT >#29#return; 2684#L14-2 call #t~ret2 := rec1(#t~ret1);< 2673#rec1ENTRY ~i := #in~i; 2686#L12 assume ~i <= 0;#res := 0; 2685#rec1FINAL assume true; 2683#rec1EXIT >#31#return; 2682#L14-3 #res := 1 + #t~ret2;havoc #t~ret1;havoc #t~ret0;havoc #t~ret2; 2681#rec1FINAL assume true; 2680#rec1EXIT >#33#return; 2653#L20-1 call #t~ret4 := rec2(#t~ret3 - 1);< 2652#rec2ENTRY ~j := #in~j; 2655#L18 assume !(~j <= 0); 2659#L20 call #t~ret3 := rec1(~j);< 2656#rec1ENTRY [2020-11-28 03:05:34,595 INFO L796 eck$LassoCheckResult]: Loop: 2656#rec1ENTRY ~i := #in~i; 2658#L12 assume !(~i <= 0); 2657#L14 call #t~ret0 := rec1(~i - 2);< 2656#rec1ENTRY [2020-11-28 03:05:34,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:34,595 INFO L82 PathProgramCache]: Analyzing trace with hash -1852176490, now seen corresponding path program 2 times [2020-11-28 03:05:34,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:34,596 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494254901] [2020-11-28 03:05:34,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:34,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:34,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-28 03:05:34,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:34,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:05:34,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:34,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:05:34,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:34,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-11-28 03:05:34,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:34,688 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-11-28 03:05:34,688 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494254901] [2020-11-28 03:05:34,688 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920629796] [2020-11-28 03:05:34,688 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:05:34,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 03:05:34,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:05:34,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:34,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:34,766 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-11-28 03:05:34,768 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:05:34,768 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2020-11-28 03:05:34,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521940043] [2020-11-28 03:05:34,769 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-11-28 03:05:34,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:34,769 INFO L82 PathProgramCache]: Analyzing trace with hash 29941, now seen corresponding path program 4 times [2020-11-28 03:05:34,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:05:34,770 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986133649] [2020-11-28 03:05:34,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:05:34,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:34,772 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:34,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:05:34,777 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:05:34,778 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:05:34,844 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:34,844 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:34,844 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:34,844 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:34,844 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-28 03:05:34,844 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:34,844 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:34,844 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:34,845 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration7_Loop [2020-11-28 03:05:34,845 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:34,845 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:34,845 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:34,855 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:34,858 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:34,861 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:34,865 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:34,875 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:34,931 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:34,932 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:34,937 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:34,937 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:34,939 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:34,939 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret2=0} Honda state: {rec1_#t~ret2=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-28 03:05:34,960 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:34,960 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:34,965 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:34,966 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret0=0} Honda state: {rec1_#t~ret0=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:34,987 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:34,987 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:34,989 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:34,989 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_#t~ret1=0} Honda state: {rec1_#t~ret1=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,010 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:35,010 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:35,012 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-28 03:05:35,012 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {rec1_~i=0} Honda state: {rec1_~i=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,033 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-28 03:05:35,033 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,056 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-28 03:05:35,056 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-28 03:05:35,118 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-28 03:05:35,119 INFO L210 LassoAnalysis]: Preferences: [2020-11-28 03:05:35,119 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-28 03:05:35,120 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-28 03:05:35,120 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-28 03:05:35,120 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-28 03:05:35,120 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,120 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-28 03:05:35,120 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-28 03:05:35,120 INFO L133 ssoRankerPreferences]: Filename of dumped script: NestedRecursion_1d.c_Iteration7_Loop [2020-11-28 03:05:35,120 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-28 03:05:35,120 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-28 03:05:35,121 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:35,123 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:35,125 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:35,127 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:35,129 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:35,134 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-28 03:05:35,165 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-28 03:05:35,166 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,170 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:35,171 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:35,172 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:35,172 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:35,172 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:35,172 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:35,172 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:35,172 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:35,173 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,203 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:35,204 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:35,204 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:35,204 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:35,204 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:35,204 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:35,205 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:35,205 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:35,206 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,228 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:35,229 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:35,230 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:35,230 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:35,230 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:35,230 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:35,230 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:35,230 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:35,231 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,253 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:35,254 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:35,254 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:35,254 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:35,254 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:35,254 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:35,255 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:35,255 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:35,256 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,277 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-28 03:05:35,278 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-28 03:05:35,278 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-28 03:05:35,279 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-28 03:05:35,279 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-28 03:05:35,279 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-28 03:05:35,280 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-28 03:05:35,280 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-28 03:05:35,281 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-28 03:05:35,283 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-28 03:05:35,283 INFO L444 ModelExtractionUtils]: 1 out of 3 variables were initially zero. Simplification set additionally 0 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_33c87ac1-83aa-4038-9dd6-7e0df36b222c/bin/uautomizer/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-28 03:05:35,287 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-28 03:05:35,287 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-28 03:05:35,288 INFO L510 LassoAnalysis]: Proved termination. [2020-11-28 03:05:35,288 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(rec1_#in~i) = 1*rec1_#in~i Supporting invariants [] [2020-11-28 03:05:35,307 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-28 03:05:35,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:35,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:35,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:05:35,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:35,421 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,424 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,428 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:35,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:35,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:35,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:35,471 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-11-28 03:05:35,471 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2020-11-28 03:05:35,546 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 63 states and 75 transitions. Complement of second has 13 states. [2020-11-28 03:05:35,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:35,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:05:35,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 10 transitions. [2020-11-28 03:05:35,548 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 10 transitions. Stem has 29 letters. Loop has 3 letters. [2020-11-28 03:05:35,548 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:35,548 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:05:35,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:35,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:35,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:05:35,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:35,665 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,668 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,679 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:35,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:35,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:35,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:35,722 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.2 stem predicates 3 loop predicates [2020-11-28 03:05:35,722 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2020-11-28 03:05:35,817 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 63 states and 75 transitions. Complement of second has 13 states. [2020-11-28 03:05:35,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:35,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:05:35,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 10 transitions. [2020-11-28 03:05:35,820 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 10 transitions. Stem has 29 letters. Loop has 3 letters. [2020-11-28 03:05:35,820 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:35,820 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-28 03:05:35,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:05:35,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:35,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-28 03:05:35,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:35,916 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,919 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,921 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:05:35,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:05:35,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:05:35,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:05:35,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:05:35,957 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.2 stem predicates 3 loop predicates [2020-11-28 03:05:35,957 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15 Second operand 5 states. [2020-11-28 03:05:36,074 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 53 states and 64 transitions. cyclomatic complexity: 15. Second operand 5 states. Result 77 states and 89 transitions. Complement of second has 13 states. [2020-11-28 03:05:36,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 2 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-28 03:05:36,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2020-11-28 03:05:36,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 24 transitions. [2020-11-28 03:05:36,075 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 3 letters. [2020-11-28 03:05:36,075 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:36,075 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 32 letters. Loop has 3 letters. [2020-11-28 03:05:36,076 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:36,076 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 24 transitions. Stem has 29 letters. Loop has 6 letters. [2020-11-28 03:05:36,076 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-28 03:05:36,076 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 77 states and 89 transitions. [2020-11-28 03:05:36,078 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-28 03:05:36,078 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 77 states to 0 states and 0 transitions. [2020-11-28 03:05:36,078 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-11-28 03:05:36,078 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-11-28 03:05:36,078 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-11-28 03:05:36,078 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-11-28 03:05:36,078 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:05:36,078 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:05:36,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:05:36,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 03:05:36,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:05:36,079 INFO L87 Difference]: Start difference. First operand 0 states and 0 transitions. Second operand 8 states. [2020-11-28 03:05:36,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:05:36,079 INFO L93 Difference]: Finished difference Result 0 states and 0 transitions. [2020-11-28 03:05:36,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-28 03:05:36,079 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 0 states and 0 transitions. [2020-11-28 03:05:36,079 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-28 03:05:36,079 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 0 states to 0 states and 0 transitions. [2020-11-28 03:05:36,080 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-11-28 03:05:36,080 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-11-28 03:05:36,080 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-11-28 03:05:36,080 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-11-28 03:05:36,080 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:05:36,080 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:05:36,080 INFO L594 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:05:36,080 INFO L427 BuchiCegarLoop]: ======== Iteration 8============ [2020-11-28 03:05:36,080 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2020-11-28 03:05:36,080 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-28 03:05:36,080 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2020-11-28 03:05:36,092 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 28.11 03:05:36 BoogieIcfgContainer [2020-11-28 03:05:36,092 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-11-28 03:05:36,095 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 03:05:36,095 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 03:05:36,095 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 03:05:36,096 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:05:27" (3/4) ... [2020-11-28 03:05:36,098 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-11-28 03:05:36,099 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 03:05:36,100 INFO L168 Benchmark]: Toolchain (without parser) took 9217.66 ms. Allocated memory was 92.3 MB in the beginning and 167.8 MB in the end (delta: 75.5 MB). Free memory was 59.9 MB in the beginning and 117.9 MB in the end (delta: -58.0 MB). Peak memory consumption was 16.9 MB. Max. memory is 16.1 GB. [2020-11-28 03:05:36,107 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 92.3 MB. Free memory was 51.8 MB in the beginning and 51.7 MB in the end (delta: 39.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:05:36,108 INFO L168 Benchmark]: CACSL2BoogieTranslator took 228.72 ms. Allocated memory was 92.3 MB in the beginning and 115.3 MB in the end (delta: 23.1 MB). Free memory was 59.7 MB in the beginning and 92.8 MB in the end (delta: -33.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 03:05:36,108 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.50 ms. Allocated memory is still 115.3 MB. Free memory was 92.8 MB in the beginning and 91.4 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:05:36,108 INFO L168 Benchmark]: Boogie Preprocessor took 17.20 ms. Allocated memory is still 115.3 MB. Free memory was 91.4 MB in the beginning and 90.8 MB in the end (delta: 640.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:05:36,109 INFO L168 Benchmark]: RCFGBuilder took 387.58 ms. Allocated memory is still 115.3 MB. Free memory was 90.8 MB in the beginning and 81.0 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-28 03:05:36,110 INFO L168 Benchmark]: BuchiAutomizer took 8535.35 ms. Allocated memory was 115.3 MB in the beginning and 167.8 MB in the end (delta: 52.4 MB). Free memory was 81.0 MB in the beginning and 117.9 MB in the end (delta: -36.8 MB). Peak memory consumption was 17.9 MB. Max. memory is 16.1 GB. [2020-11-28 03:05:36,110 INFO L168 Benchmark]: Witness Printer took 4.09 ms. Allocated memory is still 167.8 MB. Free memory is still 117.9 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:05:36,112 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 92.3 MB. Free memory was 51.8 MB in the beginning and 51.7 MB in the end (delta: 39.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 228.72 ms. Allocated memory was 92.3 MB in the beginning and 115.3 MB in the end (delta: 23.1 MB). Free memory was 59.7 MB in the beginning and 92.8 MB in the end (delta: -33.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 36.50 ms. Allocated memory is still 115.3 MB. Free memory was 92.8 MB in the beginning and 91.4 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 17.20 ms. Allocated memory is still 115.3 MB. Free memory was 91.4 MB in the beginning and 90.8 MB in the end (delta: 640.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 387.58 ms. Allocated memory is still 115.3 MB. Free memory was 90.8 MB in the beginning and 81.0 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * BuchiAutomizer took 8535.35 ms. Allocated memory was 115.3 MB in the beginning and 167.8 MB in the end (delta: 52.4 MB). Free memory was 81.0 MB in the beginning and 117.9 MB in the end (delta: -36.8 MB). Peak memory consumption was 17.9 MB. Max. memory is 16.1 GB. * Witness Printer took 4.09 ms. Allocated memory is still 167.8 MB. Free memory is still 117.9 MB. There was no memory consumed. Max. memory is 16.1 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 8.4s and 8 iterations. TraceHistogramMax:5. Analysis of lassos took 4.6s. Construction of modules took 0.5s. Büchi inclusion checks took 2.8s. Highest rank in rank-based complementation 3. Minimization of det autom 3. Minimization of nondet autom 7. Automata minimization 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 89 StatesRemovedByMinimization, 7 NontrivialMinimizations. Non-live state removal took 0.0s Buchi closure took 0.0s. Biggest automaton had 111 states and ocurred in iteration 5. Nontrivial modules had stage [3, 0, 2, 0, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 22/24 HoareTripleCheckerStatistics: 188 SDtfs, 186 SDslu, 297 SDs, 0 SdLazy, 307 SolverSat, 134 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time LassoAnalysisResults: nont0 unkn0 SFLI2 SFLT2 conc0 concLT2 SILN0 SILU0 SILI0 SILT1 lasso0 LassoPreprocessingBenchmarks: Lassos: inital12 mio100 ax100 hnf91 lsp100 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq151 hnf93 smp100 dnf100 smp100 tf112 neg100 sie111 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 15ms VariablesStem: 0 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 0 MotzkinApplications: 2 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 18 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 5 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 0.6s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...