./Ultimate.py --spec ../../sv-benchmarks/c/properties/termination.prp --file ../../sv-benchmarks/c/termination-crafted-lit/CookSeeZuleger-TACAS2013-Fig8a.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_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/config/AutomizerTermination.xml -i ../../sv-benchmarks/c/termination-crafted-lit/CookSeeZuleger-TACAS2013-Fig8a.c -s /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 df3ddc93bc6339292c9158119f1fdb949bb8842d ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-29 18:19:43,796 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-29 18:19:43,800 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-29 18:19:43,913 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-29 18:19:43,914 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-29 18:19:43,922 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-29 18:19:43,926 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-29 18:19:43,932 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-29 18:19:43,936 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-29 18:19:43,945 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-29 18:19:43,947 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-29 18:19:43,950 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-29 18:19:43,956 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-29 18:19:43,961 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-29 18:19:43,964 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-29 18:19:43,966 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-29 18:19:43,969 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-29 18:19:43,974 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-29 18:19:43,979 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-29 18:19:43,991 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-29 18:19:43,994 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-29 18:19:43,996 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-29 18:19:44,000 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-29 18:19:44,002 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-29 18:19:44,016 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-29 18:19:44,017 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-29 18:19:44,017 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-29 18:19:44,021 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-29 18:19:44,022 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-29 18:19:44,024 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-29 18:19:44,024 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-29 18:19:44,026 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-29 18:19:44,029 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-29 18:19:44,031 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-29 18:19:44,034 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-29 18:19:44,034 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-29 18:19:44,035 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-29 18:19:44,036 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-29 18:19:44,036 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-29 18:19:44,038 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-29 18:19:44,039 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-29 18:19:44,043 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-11-29 18:19:44,107 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-29 18:19:44,108 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-29 18:19:44,111 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-29 18:19:44,111 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-29 18:19:44,111 INFO L138 SettingsManager]: * Use SBE=true [2020-11-29 18:19:44,112 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-11-29 18:19:44,112 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-11-29 18:19:44,113 INFO L138 SettingsManager]: * Use old map elimination=false [2020-11-29 18:19:44,113 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-11-29 18:19:44,113 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-11-29 18:19:44,115 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-11-29 18:19:44,116 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-29 18:19:44,116 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-29 18:19:44,116 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-29 18:19:44,117 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-29 18:19:44,117 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-11-29 18:19:44,117 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-11-29 18:19:44,118 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-11-29 18:19:44,118 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-29 18:19:44,118 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-11-29 18:19:44,119 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-29 18:19:44,119 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-11-29 18:19:44,119 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-29 18:19:44,120 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-29 18:19:44,120 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-11-29 18:19:44,121 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-29 18:19:44,121 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-29 18:19:44,121 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-29 18:19:44,122 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-11-29 18:19:44,125 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-11-29 18:19:44,126 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_7db3b7e4-c41c-42f8-8447-1b64282df8af/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> df3ddc93bc6339292c9158119f1fdb949bb8842d [2020-11-29 18:19:44,534 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-29 18:19:44,602 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-29 18:19:44,609 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-29 18:19:44,612 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-29 18:19:44,613 INFO L275 PluginConnector]: CDTParser initialized [2020-11-29 18:19:44,614 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/../../sv-benchmarks/c/termination-crafted-lit/CookSeeZuleger-TACAS2013-Fig8a.c [2020-11-29 18:19:44,748 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/data/9834b12a7/3269bd93cb024e598da0fcbad55376f6/FLAG546c6066e [2020-11-29 18:19:45,498 INFO L306 CDTParser]: Found 1 translation units. [2020-11-29 18:19:45,500 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/sv-benchmarks/c/termination-crafted-lit/CookSeeZuleger-TACAS2013-Fig8a.c [2020-11-29 18:19:45,516 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/data/9834b12a7/3269bd93cb024e598da0fcbad55376f6/FLAG546c6066e [2020-11-29 18:19:45,829 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/data/9834b12a7/3269bd93cb024e598da0fcbad55376f6 [2020-11-29 18:19:45,833 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-29 18:19:45,841 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-29 18:19:45,853 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-29 18:19:45,853 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-29 18:19:45,859 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-29 18:19:45,862 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 06:19:45" (1/1) ... [2020-11-29 18:19:45,865 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8a6e1eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:45, skipping insertion in model container [2020-11-29 18:19:45,865 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 06:19:45" (1/1) ... [2020-11-29 18:19:45,877 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-29 18:19:45,901 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-29 18:19:46,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 18:19:46,134 INFO L203 MainTranslator]: Completed pre-run [2020-11-29 18:19:46,186 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 18:19:46,216 INFO L208 MainTranslator]: Completed translation [2020-11-29 18:19:46,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46 WrapperNode [2020-11-29 18:19:46,219 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-29 18:19:46,220 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-29 18:19:46,221 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-29 18:19:46,221 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-29 18:19:46,244 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,252 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,287 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-29 18:19:46,292 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-29 18:19:46,292 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-29 18:19:46,293 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-29 18:19:46,306 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,307 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,308 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,309 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,312 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,320 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,322 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... [2020-11-29 18:19:46,323 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-29 18:19:46,325 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-29 18:19:46,325 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-29 18:19:46,326 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-29 18:19:46,327 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 [2020-11-29 18:19:46,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-29 18:19:46,433 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-29 18:19:46,622 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-29 18:19:46,623 INFO L298 CfgBuilder]: Removed 5 assume(true) statements. [2020-11-29 18:19:46,625 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 06:19:46 BoogieIcfgContainer [2020-11-29 18:19:46,625 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-29 18:19:46,627 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-11-29 18:19:46,627 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-11-29 18:19:46,632 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-11-29 18:19:46,633 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-29 18:19:46,634 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 29.11 06:19:45" (1/3) ... [2020-11-29 18:19:46,636 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@762a4450 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 29.11 06:19:46, skipping insertion in model container [2020-11-29 18:19:46,636 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-29 18:19:46,637 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 06:19:46" (2/3) ... [2020-11-29 18:19:46,637 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@762a4450 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 29.11 06:19:46, skipping insertion in model container [2020-11-29 18:19:46,638 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-29 18:19:46,638 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 06:19:46" (3/3) ... [2020-11-29 18:19:46,640 INFO L373 chiAutomizerObserver]: Analyzing ICFG CookSeeZuleger-TACAS2013-Fig8a.c [2020-11-29 18:19:46,728 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-11-29 18:19:46,728 INFO L360 BuchiCegarLoop]: Hoare is false [2020-11-29 18:19:46,729 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-11-29 18:19:46,729 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-29 18:19:46,729 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-29 18:19:46,729 INFO L364 BuchiCegarLoop]: Difference is false [2020-11-29 18:19:46,729 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-29 18:19:46,730 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-11-29 18:19:46,750 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 7 states. [2020-11-29 18:19:46,779 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:46,780 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:19:46,780 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:19:46,789 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1] [2020-11-29 18:19:46,789 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1] [2020-11-29 18:19:46,789 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-11-29 18:19:46,789 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 7 states. [2020-11-29 18:19:46,791 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:46,791 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:19:46,791 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:19:46,792 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1] [2020-11-29 18:19:46,792 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1] [2020-11-29 18:19:46,803 INFO L794 eck$LassoCheckResult]: Stem: 4#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet0, main_~x~0;havoc main_~x~0;main_~x~0 := main_#t~nondet0;havoc main_#t~nondet0; 3#L17-2true [2020-11-29 18:19:46,805 INFO L796 eck$LassoCheckResult]: Loop: 3#L17-2true assume !!(0 != main_~x~0); 5#L17true assume main_~x~0 > 0;main_~x~0 := main_~x~0 - 1; 3#L17-2true [2020-11-29 18:19:46,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:46,817 INFO L82 PathProgramCache]: Analyzing trace with hash 32, now seen corresponding path program 1 times [2020-11-29 18:19:46,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:46,832 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8720760] [2020-11-29 18:19:46,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:46,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:46,969 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:46,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:46,984 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:47,006 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:47,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:47,016 INFO L82 PathProgramCache]: Analyzing trace with hash 1284, now seen corresponding path program 1 times [2020-11-29 18:19:47,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:47,018 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582238935] [2020-11-29 18:19:47,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:47,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:47,045 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:47,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:47,057 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:47,061 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:47,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:47,073 INFO L82 PathProgramCache]: Analyzing trace with hash 31075, now seen corresponding path program 1 times [2020-11-29 18:19:47,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:47,074 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458472899] [2020-11-29 18:19:47,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:47,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:47,094 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:47,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:47,104 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:47,108 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:47,330 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 10 DAG size of output: 8 [2020-11-29 18:19:47,380 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:19:47,381 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:19:47,381 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:19:47,382 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:19:47,382 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:19:47,382 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:47,383 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:19:47,383 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:19:47,383 INFO L133 ssoRankerPreferences]: Filename of dumped script: CookSeeZuleger-TACAS2013-Fig8a.c_Iteration1_Loop [2020-11-29 18:19:47,384 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:19:47,384 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:19:47,425 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:47,460 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:47,480 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:47,731 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:19:47,733 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:47,751 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:47,751 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:47,768 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:19:47,769 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {v_rep~unnamed0~0~false_1=0} Honda state: {v_rep~unnamed0~0~false_1=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:47,834 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:47,834 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 [2020-11-29 18:19:47,847 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:19:47,847 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {v_rep~unnamed0~0~true_1=1} Honda state: {v_rep~unnamed0~0~true_1=1} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:47,914 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:47,915 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 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:47,988 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:19:47,988 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 [2020-11-29 18:19:48,063 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:19:48,066 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:19:48,066 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:19:48,067 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:19:48,067 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:19:48,067 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:19:48,067 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:48,067 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:19:48,068 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:19:48,068 INFO L133 ssoRankerPreferences]: Filename of dumped script: CookSeeZuleger-TACAS2013-Fig8a.c_Iteration1_Loop [2020-11-29 18:19:48,068 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:19:48,068 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:19:48,071 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:48,087 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:48,101 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:48,284 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:19:48,291 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:48,304 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 [2020-11-29 18:19:48,308 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:48,309 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:48,309 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:19:48,309 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:48,343 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-29 18:19:48,344 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. [2020-11-29 18:19:48,353 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:48,417 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 [2020-11-29 18:19:48,420 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:48,421 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:48,421 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:19:48,421 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:48,428 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-29 18:19:48,428 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:48,446 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:48,521 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 [2020-11-29 18:19:48,526 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:48,526 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:19:48,527 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:48,527 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:19:48,527 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:48,531 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:19:48,532 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 [2020-11-29 18:19:48,541 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:19:48,551 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-29 18:19:48,551 INFO L444 ModelExtractionUtils]: 0 out of 3 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 [2020-11-29 18:19:48,563 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:19:48,563 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:19:48,563 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:19:48,564 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~x~0) = 1*ULTIMATE.start_main_~x~0 Supporting invariants [] [2020-11-29 18:19:48,615 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:19:48,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:48,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:48,666 WARN L261 TraceCheckSpWp]: Trace formula consists of 4 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-29 18:19:48,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:48,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:48,689 WARN L261 TraceCheckSpWp]: Trace formula consists of 6 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 18:19:48,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:48,695 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:48,719 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 1 loop predicates [2020-11-29 18:19:48,721 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 7 states. Second operand 3 states. [2020-11-29 18:19:48,814 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 7 states.. Second operand 3 states. Result 23 states and 30 transitions. Complement of second has 6 states. [2020-11-29 18:19:48,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 1 non-accepting loop states 1 accepting loop states [2020-11-29 18:19:48,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-29 18:19:48,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 11 transitions. [2020-11-29 18:19:48,823 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 11 transitions. Stem has 1 letters. Loop has 2 letters. [2020-11-29 18:19:48,830 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:48,831 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 11 transitions. Stem has 3 letters. Loop has 2 letters. [2020-11-29 18:19:48,831 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:48,832 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 11 transitions. Stem has 1 letters. Loop has 4 letters. [2020-11-29 18:19:48,832 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:48,834 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 23 states and 30 transitions. [2020-11-29 18:19:48,843 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:48,849 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 23 states to 7 states and 10 transitions. [2020-11-29 18:19:48,851 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 4 [2020-11-29 18:19:48,852 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 5 [2020-11-29 18:19:48,853 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 10 transitions. [2020-11-29 18:19:48,853 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:19:48,853 INFO L691 BuchiCegarLoop]: Abstraction has 7 states and 10 transitions. [2020-11-29 18:19:48,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states and 10 transitions. [2020-11-29 18:19:48,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2020-11-29 18:19:48,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-11-29 18:19:48,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 10 transitions. [2020-11-29 18:19:48,897 INFO L714 BuchiCegarLoop]: Abstraction has 7 states and 10 transitions. [2020-11-29 18:19:48,897 INFO L594 BuchiCegarLoop]: Abstraction has 7 states and 10 transitions. [2020-11-29 18:19:48,897 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-11-29 18:19:48,898 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 7 states and 10 transitions. [2020-11-29 18:19:48,899 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:48,899 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:19:48,900 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:19:48,900 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1] [2020-11-29 18:19:48,900 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1] [2020-11-29 18:19:48,901 INFO L794 eck$LassoCheckResult]: Stem: 68#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_~x~0;havoc main_~x~0;main_~x~0 := main_#t~nondet0;havoc main_#t~nondet0; 69#L17-2 assume !!(0 != main_~x~0); 67#L17 assume !(main_~x~0 > 0);main_~x~0 := 1 + main_~x~0; 63#L17-2 [2020-11-29 18:19:48,902 INFO L796 eck$LassoCheckResult]: Loop: 63#L17-2 assume !!(0 != main_~x~0); 64#L17 assume main_~x~0 > 0;main_~x~0 := main_~x~0 - 1; 63#L17-2 [2020-11-29 18:19:48,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:48,904 INFO L82 PathProgramCache]: Analyzing trace with hash 31077, now seen corresponding path program 1 times [2020-11-29 18:19:48,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:48,906 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687369073] [2020-11-29 18:19:48,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:48,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:48,916 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:48,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:48,922 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:48,923 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:48,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:48,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1284, now seen corresponding path program 2 times [2020-11-29 18:19:48,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:48,926 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785625764] [2020-11-29 18:19:48,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:48,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:48,933 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:48,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:48,938 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:48,939 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:48,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:48,940 INFO L82 PathProgramCache]: Analyzing trace with hash 29865320, now seen corresponding path program 1 times [2020-11-29 18:19:48,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:48,941 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62200353] [2020-11-29 18:19:48,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:48,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:49,029 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:49,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62200353] [2020-11-29 18:19:49,030 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196524987] [2020-11-29 18:19:49,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 18:19:49,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:49,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 12 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 18:19:49,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:49,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:49,129 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 18:19:49,129 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2020-11-29 18:19:49,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667930368] [2020-11-29 18:19:49,157 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:19:49,157 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:19:49,157 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:19:49,157 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:19:49,157 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:19:49,158 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:49,158 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:19:49,158 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:19:49,158 INFO L133 ssoRankerPreferences]: Filename of dumped script: CookSeeZuleger-TACAS2013-Fig8a.c_Iteration2_Loop [2020-11-29 18:19:49,158 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:19:49,158 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:19:49,160 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:49,170 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:49,182 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:49,319 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:19:49,320 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:49,354 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:49,355 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:49,361 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:19:49,361 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {v_rep~unnamed0~0~false_3=0} Honda state: {v_rep~unnamed0~0~false_3=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:49,421 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:49,421 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:49,428 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:19:49,428 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {v_rep~unnamed0~0~true_3=1} Honda state: {v_rep~unnamed0~0~true_3=1} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 [2020-11-29 18:19:49,482 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:49,493 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 [2020-11-29 18:19:49,554 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:19:49,554 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:19:49,590 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:19:49,592 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:19:49,592 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:19:49,592 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:19:49,592 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:19:49,592 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:19:49,593 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:49,593 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:19:49,593 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:19:49,593 INFO L133 ssoRankerPreferences]: Filename of dumped script: CookSeeZuleger-TACAS2013-Fig8a.c_Iteration2_Loop [2020-11-29 18:19:49,593 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:19:49,593 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:19:49,595 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:49,624 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:49,630 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:49,710 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:19:49,710 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 [2020-11-29 18:19:49,718 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 [2020-11-29 18:19:49,721 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:49,721 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:49,721 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:19:49,721 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:49,728 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-29 18:19:49,728 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. [2020-11-29 18:19:49,737 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:49,772 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 [2020-11-29 18:19:49,773 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:49,774 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:49,774 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:19:49,774 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:49,826 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-29 18:19:49,827 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. [2020-11-29 18:19:49,861 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:49,902 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 [2020-11-29 18:19:49,905 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:49,905 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:19:49,906 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:49,906 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:19:49,906 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:49,912 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-29 18:19:49,912 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:19:49,923 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:19:49,934 INFO L443 ModelExtractionUtils]: Simplification made 2 calls to the SMT solver. [2020-11-29 18:19:49,935 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_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:49,941 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:19:49,942 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:19:49,942 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:19:49,942 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~x~0) = 1*ULTIMATE.start_main_~x~0 Supporting invariants [] Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:49,995 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:19:50,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:50,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:50,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 8 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-29 18:19:50,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:50,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:50,050 WARN L261 TraceCheckSpWp]: Trace formula consists of 6 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 18:19:50,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:50,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:50,053 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 1 loop predicates [2020-11-29 18:19:50,053 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 7 states and 10 transitions. cyclomatic complexity: 5 Second operand 3 states. [2020-11-29 18:19:50,081 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 7 states and 10 transitions. cyclomatic complexity: 5. Second operand 3 states. Result 11 states and 16 transitions. Complement of second has 5 states. [2020-11-29 18:19:50,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 3 states 1 stem states 1 non-accepting loop states 1 accepting loop states [2020-11-29 18:19:50,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-29 18:19:50,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 6 transitions. [2020-11-29 18:19:50,084 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 6 transitions. Stem has 3 letters. Loop has 2 letters. [2020-11-29 18:19:50,084 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:50,084 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 6 transitions. Stem has 5 letters. Loop has 2 letters. [2020-11-29 18:19:50,084 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:50,085 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 6 transitions. Stem has 3 letters. Loop has 4 letters. [2020-11-29 18:19:50,085 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:50,085 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 11 states and 16 transitions. [2020-11-29 18:19:50,087 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:50,087 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 11 states to 11 states and 16 transitions. [2020-11-29 18:19:50,088 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 6 [2020-11-29 18:19:50,088 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 7 [2020-11-29 18:19:50,088 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 16 transitions. [2020-11-29 18:19:50,088 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:19:50,089 INFO L691 BuchiCegarLoop]: Abstraction has 11 states and 16 transitions. [2020-11-29 18:19:50,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states and 16 transitions. [2020-11-29 18:19:50,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-29 18:19:50,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-29 18:19:50,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 16 transitions. [2020-11-29 18:19:50,092 INFO L714 BuchiCegarLoop]: Abstraction has 11 states and 16 transitions. [2020-11-29 18:19:50,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 18:19:50,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-29 18:19:50,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-29 18:19:50,098 INFO L87 Difference]: Start difference. First operand 11 states and 16 transitions. Second operand 4 states. [2020-11-29 18:19:50,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 18:19:50,145 INFO L93 Difference]: Finished difference Result 10 states and 12 transitions. [2020-11-29 18:19:50,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-29 18:19:50,146 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 10 states and 12 transitions. [2020-11-29 18:19:50,147 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:50,148 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 10 states to 9 states and 11 transitions. [2020-11-29 18:19:50,148 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 7 [2020-11-29 18:19:50,148 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 7 [2020-11-29 18:19:50,148 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 11 transitions. [2020-11-29 18:19:50,148 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:19:50,148 INFO L691 BuchiCegarLoop]: Abstraction has 9 states and 11 transitions. [2020-11-29 18:19:50,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states and 11 transitions. [2020-11-29 18:19:50,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 6. [2020-11-29 18:19:50,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-11-29 18:19:50,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 8 transitions. [2020-11-29 18:19:50,150 INFO L714 BuchiCegarLoop]: Abstraction has 6 states and 8 transitions. [2020-11-29 18:19:50,150 INFO L594 BuchiCegarLoop]: Abstraction has 6 states and 8 transitions. [2020-11-29 18:19:50,151 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-11-29 18:19:50,151 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 6 states and 8 transitions. [2020-11-29 18:19:50,151 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:50,151 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:19:50,152 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:19:50,152 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-29 18:19:50,152 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1] [2020-11-29 18:19:50,152 INFO L794 eck$LassoCheckResult]: Stem: 157#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_~x~0;havoc main_~x~0;main_~x~0 := main_#t~nondet0;havoc main_#t~nondet0; 158#L17-2 assume !!(0 != main_~x~0); 154#L17 [2020-11-29 18:19:50,153 INFO L796 eck$LassoCheckResult]: Loop: 154#L17 assume !(main_~x~0 > 0);main_~x~0 := 1 + main_~x~0; 153#L17-2 assume !!(0 != main_~x~0); 154#L17 [2020-11-29 18:19:50,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:50,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1002, now seen corresponding path program 1 times [2020-11-29 18:19:50,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:50,154 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378778509] [2020-11-29 18:19:50,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:50,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:50,159 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:50,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:50,183 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:50,184 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:50,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:50,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1436, now seen corresponding path program 1 times [2020-11-29 18:19:50,186 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:50,186 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871245649] [2020-11-29 18:19:50,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:50,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:50,193 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:50,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:50,197 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:50,198 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:50,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:50,199 INFO L82 PathProgramCache]: Analyzing trace with hash 963397, now seen corresponding path program 2 times [2020-11-29 18:19:50,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:50,200 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155936212] [2020-11-29 18:19:50,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:50,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:50,207 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:50,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:50,212 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:50,213 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:50,275 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:19:50,275 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:19:50,275 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:19:50,275 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:19:50,275 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:19:50,276 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:50,276 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:19:50,276 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:19:50,276 INFO L133 ssoRankerPreferences]: Filename of dumped script: CookSeeZuleger-TACAS2013-Fig8a.c_Iteration3_Loop [2020-11-29 18:19:50,276 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:19:50,276 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:19:50,278 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:50,287 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:50,305 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:50,438 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:19:50,438 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:50,448 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:50,448 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:50,454 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:19:50,455 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {v_rep~unnamed0~0~true_5=1} Honda state: {v_rep~unnamed0~0~true_5=1} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:50,520 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:50,521 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:50,586 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:19:50,586 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:50,739 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:19:50,741 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:19:50,742 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:19:50,742 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:19:50,742 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:19:50,742 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:19:50,742 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:50,742 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:19:50,742 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:19:50,743 INFO L133 ssoRankerPreferences]: Filename of dumped script: CookSeeZuleger-TACAS2013-Fig8a.c_Iteration3_Loop [2020-11-29 18:19:50,743 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:19:50,743 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:19:50,744 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:50,755 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:50,778 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:50,925 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:19:50,925 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:50,935 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 [2020-11-29 18:19:50,937 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:50,937 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:50,937 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:19:50,937 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:50,941 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-29 18:19:50,941 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:50,947 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 [2020-11-29 18:19:50,999 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 [2020-11-29 18:19:51,001 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:51,002 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:19:51,002 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:51,002 INFO L204 nArgumentSynthesizer]: 2 loop disjuncts [2020-11-29 18:19:51,002 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:51,005 INFO L401 nArgumentSynthesizer]: We have 4 Motzkin's Theorem applications. [2020-11-29 18:19:51,005 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:19:51,013 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:19:51,023 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-29 18:19:51,023 INFO L444 ModelExtractionUtils]: 0 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_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:51,028 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:19:51,029 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:19:51,029 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:19:51,029 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~x~0) = -2*ULTIMATE.start_main_~x~0 + 1 Supporting invariants [] Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:51,059 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:19:51,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:51,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:51,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 5 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-29 18:19:51,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:51,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:51,123 WARN L261 TraceCheckSpWp]: Trace formula consists of 6 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 18:19:51,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:51,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:51,174 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 2 loop predicates [2020-11-29 18:19:51,175 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 6 states and 8 transitions. cyclomatic complexity: 4 Second operand 3 states. [2020-11-29 18:19:51,239 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 6 states and 8 transitions. cyclomatic complexity: 4. Second operand 3 states. Result 11 states and 13 transitions. Complement of second has 5 states. [2020-11-29 18:19:51,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 3 states 1 stem states 1 non-accepting loop states 1 accepting loop states [2020-11-29 18:19:51,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-29 18:19:51,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 5 transitions. [2020-11-29 18:19:51,241 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 5 transitions. Stem has 2 letters. Loop has 2 letters. [2020-11-29 18:19:51,241 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:51,241 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 5 transitions. Stem has 4 letters. Loop has 2 letters. [2020-11-29 18:19:51,241 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:51,242 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 5 transitions. Stem has 2 letters. Loop has 4 letters. [2020-11-29 18:19:51,242 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:51,242 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 11 states and 13 transitions. [2020-11-29 18:19:51,243 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:51,244 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 11 states to 7 states and 8 transitions. [2020-11-29 18:19:51,244 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 4 [2020-11-29 18:19:51,244 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 4 [2020-11-29 18:19:51,244 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 8 transitions. [2020-11-29 18:19:51,244 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-29 18:19:51,245 INFO L691 BuchiCegarLoop]: Abstraction has 7 states and 8 transitions. [2020-11-29 18:19:51,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states and 8 transitions. [2020-11-29 18:19:51,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 6. [2020-11-29 18:19:51,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-11-29 18:19:51,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 7 transitions. [2020-11-29 18:19:51,247 INFO L714 BuchiCegarLoop]: Abstraction has 6 states and 7 transitions. [2020-11-29 18:19:51,247 INFO L594 BuchiCegarLoop]: Abstraction has 6 states and 7 transitions. [2020-11-29 18:19:51,247 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-11-29 18:19:51,248 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 6 states and 7 transitions. [2020-11-29 18:19:51,248 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 2 [2020-11-29 18:19:51,249 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-29 18:19:51,249 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-29 18:19:51,249 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1] [2020-11-29 18:19:51,249 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1] [2020-11-29 18:19:51,250 INFO L794 eck$LassoCheckResult]: Stem: 207#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_~x~0;havoc main_~x~0;main_~x~0 := main_#t~nondet0;havoc main_#t~nondet0; 203#L17-2 assume !!(0 != main_~x~0); 204#L17 assume main_~x~0 > 0;main_~x~0 := main_~x~0 - 1; 205#L17-2 assume !!(0 != main_~x~0); 206#L17 [2020-11-29 18:19:51,250 INFO L796 eck$LassoCheckResult]: Loop: 206#L17 assume !(main_~x~0 > 0);main_~x~0 := 1 + main_~x~0; 208#L17-2 assume !!(0 != main_~x~0); 206#L17 [2020-11-29 18:19:51,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:51,251 INFO L82 PathProgramCache]: Analyzing trace with hash 963335, now seen corresponding path program 2 times [2020-11-29 18:19:51,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:51,251 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165883769] [2020-11-29 18:19:51,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:51,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:51,260 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:51,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:51,271 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:51,273 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:51,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:51,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1436, now seen corresponding path program 2 times [2020-11-29 18:19:51,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:51,278 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082556497] [2020-11-29 18:19:51,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:51,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:51,296 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:51,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-29 18:19:51,300 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-29 18:19:51,301 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-29 18:19:51,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:51,302 INFO L82 PathProgramCache]: Analyzing trace with hash 925765410, now seen corresponding path program 2 times [2020-11-29 18:19:51,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 18:19:51,303 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479576050] [2020-11-29 18:19:51,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 18:19:51,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:51,432 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:51,432 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479576050] [2020-11-29 18:19:51,432 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 18:19:51,432 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-29 18:19:51,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963284906] [2020-11-29 18:19:51,456 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:19:51,456 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:19:51,456 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:19:51,456 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:19:51,457 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-29 18:19:51,457 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:51,457 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:19:51,457 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:19:51,457 INFO L133 ssoRankerPreferences]: Filename of dumped script: CookSeeZuleger-TACAS2013-Fig8a.c_Iteration4_Loop [2020-11-29 18:19:51,457 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:19:51,457 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:19:51,459 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:51,470 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:51,484 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:51,597 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:19:51,598 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:51,606 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:51,607 INFO L160 nArgumentSynthesizer]: Using integer mode. Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:51,613 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-29 18:19:51,613 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {v_rep~unnamed0~0~true_7=1} Honda state: {v_rep~unnamed0~0~true_7=1} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:51,674 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-29 18:19:51,675 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 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 [2020-11-29 18:19:51,740 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-29 18:19:51,740 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-29 18:19:51,891 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-29 18:19:51,893 INFO L210 LassoAnalysis]: Preferences: [2020-11-29 18:19:51,893 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-29 18:19:51,893 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-29 18:19:51,893 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-29 18:19:51,893 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-29 18:19:51,894 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:51,894 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-29 18:19:51,894 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-29 18:19:51,894 INFO L133 ssoRankerPreferences]: Filename of dumped script: CookSeeZuleger-TACAS2013-Fig8a.c_Iteration4_Loop [2020-11-29 18:19:51,894 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-29 18:19:51,894 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-29 18:19:51,896 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:51,922 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:51,938 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-29 18:19:52,079 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-29 18:19:52,079 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/bin/uautomizer/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:52,087 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 [2020-11-29 18:19:52,090 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:52,090 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:52,091 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-29 18:19:52,091 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:52,095 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-29 18:19:52,095 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. [2020-11-29 18:19:52,101 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7db3b7e4-c41c-42f8-8447-1b64282df8af/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 [2020-11-29 18:19:52,164 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 [2020-11-29 18:19:52,167 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-29 18:19:52,167 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-29 18:19:52,167 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-29 18:19:52,167 INFO L204 nArgumentSynthesizer]: 2 loop disjuncts [2020-11-29 18:19:52,167 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-29 18:19:52,172 INFO L401 nArgumentSynthesizer]: We have 4 Motzkin's Theorem applications. [2020-11-29 18:19:52,172 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-29 18:19:52,178 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-29 18:19:52,185 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-29 18:19:52,185 INFO L444 ModelExtractionUtils]: 0 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_7db3b7e4-c41c-42f8-8447-1b64282df8af/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) [2020-11-29 18:19:52,190 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-29 18:19:52,190 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-29 18:19:52,190 INFO L510 LassoAnalysis]: Proved termination. [2020-11-29 18:19:52,190 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~x~0) = -2*ULTIMATE.start_main_~x~0 + 1 Supporting invariants [] Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-29 18:19:52,242 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-29 18:19:52,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:52,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:52,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 9 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-29 18:19:52,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:52,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:52,298 WARN L261 TraceCheckSpWp]: Trace formula consists of 6 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 18:19:52,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:52,342 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:52,343 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and without honda bouncer for loop.1 stem predicates 2 loop predicates [2020-11-29 18:19:52,343 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 6 states and 7 transitions. cyclomatic complexity: 3 Second operand 3 states. [2020-11-29 18:19:52,353 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 6 states and 7 transitions. cyclomatic complexity: 3. Second operand 3 states. Result 7 states and 8 transitions. Complement of second has 3 states. [2020-11-29 18:19:52,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 2 states 1 stem states 0 non-accepting loop states 1 accepting loop states [2020-11-29 18:19:52,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-29 18:19:52,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 2 transitions. [2020-11-29 18:19:52,355 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 2 states and 2 transitions. Stem has 4 letters. Loop has 2 letters. [2020-11-29 18:19:52,355 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:52,355 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-29 18:19:52,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:52,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:52,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 9 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-29 18:19:52,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:52,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:52,408 WARN L261 TraceCheckSpWp]: Trace formula consists of 6 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 18:19:52,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:52,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:52,460 INFO L152 lantAutomatonBouncer]: Defining deterministic Buchi interpolant automaton with honda bouncer for stem and with honda bouncer for loop.1 stem predicates 2 loop predicates [2020-11-29 18:19:52,461 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 6 states and 7 transitions. cyclomatic complexity: 3 Second operand 3 states. [2020-11-29 18:19:52,473 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 6 states and 7 transitions. cyclomatic complexity: 3. Second operand 3 states. Result 7 states and 8 transitions. Complement of second has 3 states. [2020-11-29 18:19:52,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 2 states 1 stem states 0 non-accepting loop states 1 accepting loop states [2020-11-29 18:19:52,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-29 18:19:52,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 2 transitions. [2020-11-29 18:19:52,475 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 2 states and 2 transitions. Stem has 4 letters. Loop has 2 letters. [2020-11-29 18:19:52,475 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:52,475 INFO L639 RefineBuchi]: Bad chosen interpolant automaton: word not accepted [2020-11-29 18:19:52,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 18:19:52,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:52,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 9 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-29 18:19:52,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:52,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 18:19:52,513 WARN L261 TraceCheckSpWp]: Trace formula consists of 6 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-29 18:19:52,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 18:19:52,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 18:19:52,565 INFO L152 lantAutomatonBouncer]: Defining Buchi interpolant automaton with scrooge nondeterminism in stemwith honda bouncer for stem and without honda bouncer for loop.1 stem predicates 2 loop predicates [2020-11-29 18:19:52,565 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 6 states and 7 transitions. cyclomatic complexity: 3 Second operand 3 states. [2020-11-29 18:19:52,584 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 6 states and 7 transitions. cyclomatic complexity: 3. Second operand 3 states. Result 8 states and 9 transitions. Complement of second has 4 states. [2020-11-29 18:19:52,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 3 states 1 stem states 1 non-accepting loop states 1 accepting loop states [2020-11-29 18:19:52,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-29 18:19:52,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 8 transitions. [2020-11-29 18:19:52,594 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 8 transitions. Stem has 4 letters. Loop has 2 letters. [2020-11-29 18:19:52,595 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:52,595 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 8 transitions. Stem has 6 letters. Loop has 2 letters. [2020-11-29 18:19:52,595 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:52,596 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 8 transitions. Stem has 4 letters. Loop has 4 letters. [2020-11-29 18:19:52,597 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-29 18:19:52,597 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 8 states and 9 transitions. [2020-11-29 18:19:52,598 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-29 18:19:52,598 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 8 states to 0 states and 0 transitions. [2020-11-29 18:19:52,598 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-11-29 18:19:52,598 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-11-29 18:19:52,599 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-11-29 18:19:52,599 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-11-29 18:19:52,599 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 18:19:52,599 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 18:19:52,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 18:19:52,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-29 18:19:52,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-11-29 18:19:52,600 INFO L87 Difference]: Start difference. First operand 0 states and 0 transitions. Second operand 4 states. [2020-11-29 18:19:52,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 18:19:52,600 INFO L93 Difference]: Finished difference Result 0 states and 0 transitions. [2020-11-29 18:19:52,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-29 18:19:52,600 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 0 states and 0 transitions. [2020-11-29 18:19:52,600 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-29 18:19:52,601 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 0 states to 0 states and 0 transitions. [2020-11-29 18:19:52,601 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 0 [2020-11-29 18:19:52,601 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 0 [2020-11-29 18:19:52,601 INFO L73 IsDeterministic]: Start isDeterministic. Operand 0 states and 0 transitions. [2020-11-29 18:19:52,601 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2020-11-29 18:19:52,601 INFO L691 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 18:19:52,601 INFO L714 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 18:19:52,601 INFO L594 BuchiCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 18:19:52,602 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-11-29 18:19:52,602 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 0 states and 0 transitions. [2020-11-29 18:19:52,602 INFO L131 ngComponentsAnalysis]: Automaton has 0 accepting balls. 0 [2020-11-29 18:19:52,602 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is true [2020-11-29 18:19:52,609 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 29.11 06:19:52 BoogieIcfgContainer [2020-11-29 18:19:52,610 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-11-29 18:19:52,611 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-29 18:19:52,611 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-29 18:19:52,611 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-29 18:19:52,612 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 06:19:46" (3/4) ... [2020-11-29 18:19:52,617 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-11-29 18:19:52,618 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-29 18:19:52,621 INFO L168 Benchmark]: Toolchain (without parser) took 6778.32 ms. Allocated memory was 104.9 MB in the beginning and 138.4 MB in the end (delta: 33.6 MB). Free memory was 72.1 MB in the beginning and 48.0 MB in the end (delta: 24.1 MB). Peak memory consumption was 57.2 MB. Max. memory is 16.1 GB. [2020-11-29 18:19:52,623 INFO L168 Benchmark]: CDTParser took 16.29 ms. Allocated memory was 69.2 MB in the beginning and 104.9 MB in the end (delta: 35.7 MB). Free memory was 31.1 MB in the beginning and 82.0 MB in the end (delta: -50.9 MB). Peak memory consumption was 5.6 MB. Max. memory is 16.1 GB. [2020-11-29 18:19:52,626 INFO L168 Benchmark]: CACSL2BoogieTranslator took 366.79 ms. Allocated memory is still 104.9 MB. Free memory was 71.9 MB in the beginning and 83.3 MB in the end (delta: -11.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-29 18:19:52,629 INFO L168 Benchmark]: Boogie Procedure Inliner took 68.47 ms. Allocated memory is still 104.9 MB. Free memory was 83.3 MB in the beginning and 81.9 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:19:52,635 INFO L168 Benchmark]: Boogie Preprocessor took 31.69 ms. Allocated memory is still 104.9 MB. Free memory was 81.9 MB in the beginning and 80.9 MB in the end (delta: 972.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:19:52,636 INFO L168 Benchmark]: RCFGBuilder took 300.56 ms. Allocated memory is still 104.9 MB. Free memory was 80.9 MB in the beginning and 73.0 MB in the end (delta: 7.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-29 18:19:52,638 INFO L168 Benchmark]: BuchiAutomizer took 5983.34 ms. Allocated memory was 104.9 MB in the beginning and 138.4 MB in the end (delta: 33.6 MB). Free memory was 73.0 MB in the beginning and 48.0 MB in the end (delta: 24.9 MB). Peak memory consumption was 60.1 MB. Max. memory is 16.1 GB. [2020-11-29 18:19:52,639 INFO L168 Benchmark]: Witness Printer took 7.74 ms. Allocated memory is still 138.4 MB. Free memory is still 48.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 18:19:52,645 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 16.29 ms. Allocated memory was 69.2 MB in the beginning and 104.9 MB in the end (delta: 35.7 MB). Free memory was 31.1 MB in the beginning and 82.0 MB in the end (delta: -50.9 MB). Peak memory consumption was 5.6 MB. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 366.79 ms. Allocated memory is still 104.9 MB. Free memory was 71.9 MB in the beginning and 83.3 MB in the end (delta: -11.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 68.47 ms. Allocated memory is still 104.9 MB. Free memory was 83.3 MB in the beginning and 81.9 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.69 ms. Allocated memory is still 104.9 MB. Free memory was 81.9 MB in the beginning and 80.9 MB in the end (delta: 972.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 300.56 ms. Allocated memory is still 104.9 MB. Free memory was 80.9 MB in the beginning and 73.0 MB in the end (delta: 7.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * BuchiAutomizer took 5983.34 ms. Allocated memory was 104.9 MB in the beginning and 138.4 MB in the end (delta: 33.6 MB). Free memory was 73.0 MB in the beginning and 48.0 MB in the end (delta: 24.9 MB). Peak memory consumption was 60.1 MB. Max. memory is 16.1 GB. * Witness Printer took 7.74 ms. Allocated memory is still 138.4 MB. Free memory is still 48.0 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 6 terminating modules (2 trivial, 3 deterministic, 1 nondeterministic). One deterministic module has affine ranking function x and consists of 4 locations. One deterministic module has affine ranking function x and consists of 3 locations. One deterministic module has affine ranking function -2 * x + 1 and consists of 3 locations. One nondeterministic module has affine ranking function -2 * x + 1 and consists of 3 locations. 2 modules have a trivial ranking function, the largest among these consists of 4 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 5.9s and 5 iterations. TraceHistogramMax:2. Analysis of lassos took 4.8s. Construction of modules took 0.1s. Büchi inclusion checks took 0.7s. Highest rank in rank-based complementation 3. Minimization of det autom 2. Minimization of nondet autom 4. Automata minimization 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations. Non-live state removal took 0.0s Buchi closure took 0.0s. Biggest automaton had 7 states and ocurred in iteration 1. Nontrivial modules had stage [3, 0, 1, 0, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 0/0 HoareTripleCheckerStatistics: 20 SDtfs, 18 SDslu, 3 SDs, 0 SdLazy, 43 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time LassoAnalysisResults: nont0 unkn0 SFLI0 SFLT2 conc0 concLT2 SILN0 SILU0 SILI0 SILT0 lasso0 LassoPreprocessingBenchmarks: Lassos: inital12 mio100 ax200 hnf98 lsp49 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq165 hnf94 smp100 dnf132 smp89 tf110 neg96 sie112 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 61ms VariablesStem: 1 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 2 MotzkinApplications: 6 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 6 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 4 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 0.8s - TerminationAnalysisResult: Termination proven Buchi Automizer proved that your program is terminating RESULT: Ultimate proved your program to be correct! Received shutdown request...