./Ultimate.py --spec ../../sv-benchmarks/c/properties/termination.prp --file ../../sv-benchmarks/c/termination-restricted-15/Flip2.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_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/config/AutomizerTermination.xml -i ../../sv-benchmarks/c/termination-restricted-15/Flip2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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 cda310f9ec541637625c4cf2e3662e22b6979f61 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(TERM) --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-30 00:31:52,498 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 00:31:52,500 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 00:31:52,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 00:31:52,545 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 00:31:52,554 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 00:31:52,557 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 00:31:52,565 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 00:31:52,568 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 00:31:52,576 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 00:31:52,577 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 00:31:52,579 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 00:31:52,580 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 00:31:52,584 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 00:31:52,586 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 00:31:52,589 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 00:31:52,590 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 00:31:52,595 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 00:31:52,599 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 00:31:52,604 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 00:31:52,608 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 00:31:52,610 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 00:31:52,612 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 00:31:52,613 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 00:31:52,620 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 00:31:52,620 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 00:31:52,621 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 00:31:52,623 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 00:31:52,624 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 00:31:52,625 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 00:31:52,625 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 00:31:52,628 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 00:31:52,630 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 00:31:52,631 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 00:31:52,632 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 00:31:52,632 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 00:31:52,633 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 00:31:52,634 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 00:31:52,634 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 00:31:52,635 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 00:31:52,636 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 00:31:52,639 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/config/svcomp-Termination-64bit-Automizer_Default.epf [2020-11-30 00:31:52,682 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 00:31:52,683 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 00:31:52,685 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-30 00:31:52,686 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-30 00:31:52,686 INFO L138 SettingsManager]: * Use SBE=true [2020-11-30 00:31:52,686 INFO L136 SettingsManager]: Preferences of BuchiAutomizer differ from their defaults: [2020-11-30 00:31:52,687 INFO L138 SettingsManager]: * NCSB implementation=INTSET_LAZY3 [2020-11-30 00:31:52,687 INFO L138 SettingsManager]: * Use old map elimination=false [2020-11-30 00:31:52,687 INFO L138 SettingsManager]: * Use external solver (rank synthesis)=false [2020-11-30 00:31:52,687 INFO L138 SettingsManager]: * Use only trivial implications for array writes=true [2020-11-30 00:31:52,688 INFO L138 SettingsManager]: * Rank analysis=LINEAR_WITH_GUESSES [2020-11-30 00:31:52,689 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 00:31:52,689 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-30 00:31:52,690 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 00:31:52,690 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 00:31:52,690 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=ASSUME [2020-11-30 00:31:52,690 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=ASSUME [2020-11-30 00:31:52,691 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=ASSUME [2020-11-30 00:31:52,691 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 00:31:52,691 INFO L138 SettingsManager]: * Assume nondeterminstic values are in range=false [2020-11-30 00:31:52,691 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 00:31:52,691 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=ASSUME [2020-11-30 00:31:52,692 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 00:31:52,692 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-30 00:31:52,692 INFO L138 SettingsManager]: * To the following directory=/home/matthias/ultimate/dump [2020-11-30 00:31:52,693 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 00:31:52,693 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-30 00:31:52,693 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 00:31:52,693 INFO L138 SettingsManager]: * Dump automata to the following directory=/home/matthias/ultimate/dump/auto [2020-11-30 00:31:52,696 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2020-11-30 00:31:52,696 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_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(F end) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cda310f9ec541637625c4cf2e3662e22b6979f61 [2020-11-30 00:31:52,983 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 00:31:53,027 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 00:31:53,037 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 00:31:53,038 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 00:31:53,039 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 00:31:53,040 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/../../sv-benchmarks/c/termination-restricted-15/Flip2.c [2020-11-30 00:31:53,131 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/data/c0a91d3ad/cfcab97bc5c14a0ca2912eb62e3e96a0/FLAG9a5cb70bc [2020-11-30 00:31:53,563 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 00:31:53,563 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/sv-benchmarks/c/termination-restricted-15/Flip2.c [2020-11-30 00:31:53,569 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/data/c0a91d3ad/cfcab97bc5c14a0ca2912eb62e3e96a0/FLAG9a5cb70bc [2020-11-30 00:31:53,959 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/data/c0a91d3ad/cfcab97bc5c14a0ca2912eb62e3e96a0 [2020-11-30 00:31:53,962 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 00:31:53,963 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 00:31:53,973 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 00:31:53,973 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 00:31:53,977 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 00:31:53,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 12:31:53" (1/1) ... [2020-11-30 00:31:53,981 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a99e8eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:53, skipping insertion in model container [2020-11-30 00:31:53,981 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 12:31:53" (1/1) ... [2020-11-30 00:31:53,988 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 00:31:54,008 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 00:31:54,167 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 00:31:54,192 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 00:31:54,207 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 00:31:54,220 INFO L208 MainTranslator]: Completed translation [2020-11-30 00:31:54,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54 WrapperNode [2020-11-30 00:31:54,220 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 00:31:54,221 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 00:31:54,222 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 00:31:54,222 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 00:31:54,236 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,241 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,261 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 00:31:54,263 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 00:31:54,263 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 00:31:54,263 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 00:31:54,271 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,271 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,273 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,273 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,276 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,279 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,280 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... [2020-11-30 00:31:54,281 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 00:31:54,282 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 00:31:54,282 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 00:31:54,282 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 00:31:54,283 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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 [2020-11-30 00:31:54,348 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 00:31:54,348 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 00:31:54,485 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 00:31:54,485 INFO L298 CfgBuilder]: Removed 5 assume(true) statements. [2020-11-30 00:31:54,486 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 12:31:54 BoogieIcfgContainer [2020-11-30 00:31:54,487 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 00:31:54,488 INFO L113 PluginConnector]: ------------------------BuchiAutomizer---------------------------- [2020-11-30 00:31:54,488 INFO L271 PluginConnector]: Initializing BuchiAutomizer... [2020-11-30 00:31:54,491 INFO L275 PluginConnector]: BuchiAutomizer initialized [2020-11-30 00:31:54,492 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-30 00:31:54,492 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "CDTParser AST 30.11 12:31:53" (1/3) ... [2020-11-30 00:31:54,493 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@1353987f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 30.11 12:31:54, skipping insertion in model container [2020-11-30 00:31:54,494 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-30 00:31:54,494 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 12:31:54" (2/3) ... [2020-11-30 00:31:54,494 INFO L205 PluginConnector]: Invalid model from BuchiAutomizer for observer de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer.BuchiAutomizerObserver@1353987f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer AST 30.11 12:31:54, skipping insertion in model container [2020-11-30 00:31:54,494 INFO L99 BuchiAutomizer]: Safety of program was proven or not checked, starting termination analysis [2020-11-30 00:31:54,495 INFO L185 PluginConnector]: Executing the observer BuchiAutomizerObserver from plugin BuchiAutomizer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 12:31:54" (3/3) ... [2020-11-30 00:31:54,496 INFO L373 chiAutomizerObserver]: Analyzing ICFG Flip2.c [2020-11-30 00:31:54,542 INFO L359 BuchiCegarLoop]: Interprodecural is true [2020-11-30 00:31:54,542 INFO L360 BuchiCegarLoop]: Hoare is false [2020-11-30 00:31:54,542 INFO L361 BuchiCegarLoop]: Compute interpolants for ForwardPredicates [2020-11-30 00:31:54,543 INFO L362 BuchiCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 00:31:54,543 INFO L363 BuchiCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 00:31:54,543 INFO L364 BuchiCegarLoop]: Difference is false [2020-11-30 00:31:54,543 INFO L365 BuchiCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 00:31:54,543 INFO L368 BuchiCegarLoop]: ======== Iteration 0==of CEGAR loop == BuchiCegarLoop======== [2020-11-30 00:31:54,556 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 8 states. [2020-11-30 00:31:54,572 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2020-11-30 00:31:54,572 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-30 00:31:54,572 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-30 00:31:54,579 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1] [2020-11-30 00:31:54,579 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1] [2020-11-30 00:31:54,579 INFO L427 BuchiCegarLoop]: ======== Iteration 1============ [2020-11-30 00:31:54,579 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 8 states. [2020-11-30 00:31:54,580 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 3 [2020-11-30 00:31:54,581 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-30 00:31:54,581 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-30 00:31:54,581 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1] [2020-11-30 00:31:54,581 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1] [2020-11-30 00:31:54,588 INFO L794 eck$LassoCheckResult]: Stem: 3#ULTIMATE.startENTRYtrue havoc main_#res;havoc main_#t~nondet0, main_#t~nondet1, main_~i~0, main_~j~0, main_~t~0;havoc main_~i~0;havoc main_~j~0;havoc main_~t~0;main_~i~0 := main_#t~nondet0;havoc main_#t~nondet0;main_~j~0 := main_#t~nondet1;havoc main_#t~nondet1;main_~t~0 := 0; 6#L19-2true [2020-11-30 00:31:54,589 INFO L796 eck$LassoCheckResult]: Loop: 6#L19-2true assume !!(main_~i~0 > 0 && main_~j~0 > 0); 10#L14true assume main_~i~0 < main_~j~0;main_~t~0 := main_~i~0;main_~i~0 := main_~j~0;main_~j~0 := main_~t~0; 6#L19-2true [2020-11-30 00:31:54,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:54,595 INFO L82 PathProgramCache]: Analyzing trace with hash 32, now seen corresponding path program 1 times [2020-11-30 00:31:54,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:54,604 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765919220] [2020-11-30 00:31:54,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:54,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:54,679 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:54,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:54,684 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:54,698 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:54,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:54,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1284, now seen corresponding path program 1 times [2020-11-30 00:31:54,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:54,701 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110756101] [2020-11-30 00:31:54,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:54,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:54,714 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:54,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:54,721 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:54,722 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:54,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:54,724 INFO L82 PathProgramCache]: Analyzing trace with hash 31075, now seen corresponding path program 1 times [2020-11-30 00:31:54,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:54,725 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461524021] [2020-11-30 00:31:54,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:54,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:54,733 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:54,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:54,738 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:54,740 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:54,920 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 12 [2020-11-30 00:31:54,966 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:54,967 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:54,967 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:54,967 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:54,967 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-30 00:31:54,967 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:54,968 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:54,968 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:54,968 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration1_Loop [2020-11-30 00:31:54,968 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:54,968 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:54,991 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:55,006 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:55,016 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:55,156 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:55,157 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:55,166 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:55,167 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:55,183 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-30 00:31:55,184 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_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:55,235 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:55,235 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 [2020-11-30 00:31:55,240 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-30 00:31:55,240 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_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:55,289 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:55,289 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:55,334 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-30 00:31:55,334 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:55,590 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-30 00:31:55,592 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:55,592 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:55,592 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:55,592 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:55,592 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-30 00:31:55,593 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:55,593 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:55,593 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:55,593 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration1_Loop [2020-11-30 00:31:55,593 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:55,593 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:55,595 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:55,621 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:55,636 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:55,752 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:55,757 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:55,767 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 [2020-11-30 00:31:55,769 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:55,770 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:55,770 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:55,770 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:55,776 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-30 00:31:55,776 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:55,795 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:55,839 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 [2020-11-30 00:31:55,843 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:55,843 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:55,844 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:55,844 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:55,850 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-30 00:31:55,851 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 [2020-11-30 00:31:55,862 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:55,910 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-30 00:31:55,916 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:55,916 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-30 00:31:55,917 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:55,917 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:55,917 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:55,920 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-30 00:31:55,920 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. [2020-11-30 00:31:55,924 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-30 00:31:55,931 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-30 00:31:55,931 INFO L444 ModelExtractionUtils]: 2 out of 5 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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 [2020-11-30 00:31:55,942 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-30 00:31:55,943 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-30 00:31:55,943 INFO L510 LassoAnalysis]: Proved termination. [2020-11-30 00:31:55,943 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~j~0) = 1*ULTIMATE.start_main_~j~0 Supporting invariants [] [2020-11-30 00:31:55,982 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-30 00:31:56,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:56,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:56,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 8 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-30 00:31:56,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:31:56,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:56,046 WARN L261 TraceCheckSpWp]: Trace formula consists of 11 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 00:31:56,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:31:56,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 00:31:56,083 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 [2020-11-30 00:31:56,084 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 8 states. Second operand 3 states. [2020-11-30 00:31:56,161 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 8 states.. Second operand 3 states. Result 30 states and 43 transitions. Complement of second has 8 states. [2020-11-30 00:31:56,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 5 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-30 00:31:56,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-30 00:31:56,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 16 transitions. [2020-11-30 00:31:56,168 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 16 transitions. Stem has 1 letters. Loop has 2 letters. [2020-11-30 00:31:56,169 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:56,169 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 16 transitions. Stem has 3 letters. Loop has 2 letters. [2020-11-30 00:31:56,169 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:56,169 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 5 states and 16 transitions. Stem has 1 letters. Loop has 4 letters. [2020-11-30 00:31:56,169 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:56,172 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 30 states and 43 transitions. [2020-11-30 00:31:56,179 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 6 [2020-11-30 00:31:56,183 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 30 states to 13 states and 19 transitions. [2020-11-30 00:31:56,184 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 8 [2020-11-30 00:31:56,185 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 9 [2020-11-30 00:31:56,185 INFO L73 IsDeterministic]: Start isDeterministic. Operand 13 states and 19 transitions. [2020-11-30 00:31:56,186 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-30 00:31:56,186 INFO L691 BuchiCegarLoop]: Abstraction has 13 states and 19 transitions. [2020-11-30 00:31:56,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states and 19 transitions. [2020-11-30 00:31:56,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2020-11-30 00:31:56,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-11-30 00:31:56,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 18 transitions. [2020-11-30 00:31:56,218 INFO L714 BuchiCegarLoop]: Abstraction has 12 states and 18 transitions. [2020-11-30 00:31:56,218 INFO L594 BuchiCegarLoop]: Abstraction has 12 states and 18 transitions. [2020-11-30 00:31:56,218 INFO L427 BuchiCegarLoop]: ======== Iteration 2============ [2020-11-30 00:31:56,219 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 12 states and 18 transitions. [2020-11-30 00:31:56,221 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 6 [2020-11-30 00:31:56,221 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-30 00:31:56,221 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-30 00:31:56,222 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1] [2020-11-30 00:31:56,222 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-30 00:31:56,222 INFO L794 eck$LassoCheckResult]: Stem: 75#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_#t~nondet1, main_~i~0, main_~j~0, main_~t~0;havoc main_~i~0;havoc main_~j~0;havoc main_~t~0;main_~i~0 := main_#t~nondet0;havoc main_#t~nondet0;main_~j~0 := main_#t~nondet1;havoc main_#t~nondet1;main_~t~0 := 0; 76#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 78#L14 [2020-11-30 00:31:56,223 INFO L796 eck$LassoCheckResult]: Loop: 78#L14 assume !(main_~i~0 < main_~j~0); 84#L19 assume !(main_~i~0 > main_~j~0);main_~i~0 := main_~i~0 - 1; 77#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 78#L14 [2020-11-30 00:31:56,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:56,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1002, now seen corresponding path program 1 times [2020-11-30 00:31:56,223 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:56,224 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424887196] [2020-11-30 00:31:56,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:56,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:56,238 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:56,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:56,250 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:56,252 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:56,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:56,252 INFO L82 PathProgramCache]: Analyzing trace with hash 44836, now seen corresponding path program 1 times [2020-11-30 00:31:56,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:56,253 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12492860] [2020-11-30 00:31:56,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:56,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:56,259 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:56,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:56,263 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:56,264 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:56,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:56,265 INFO L82 PathProgramCache]: Analyzing trace with hash 29865627, now seen corresponding path program 1 times [2020-11-30 00:31:56,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:56,265 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632388815] [2020-11-30 00:31:56,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:56,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:56,273 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:56,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:56,279 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:56,280 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:56,328 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:56,328 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:56,328 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:56,328 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:56,329 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-30 00:31:56,329 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:56,329 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:56,329 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:56,329 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration2_Loop [2020-11-30 00:31:56,329 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:56,329 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:56,331 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:56,339 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:56,343 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:56,408 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:56,408 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:56,420 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:56,420 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:56,424 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-30 00:31:56,424 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_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:56,454 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:56,454 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:56,459 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-30 00:31:56,459 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_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:56,494 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:56,494 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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 [2020-11-30 00:31:56,536 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-30 00:31:56,536 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:56,640 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-30 00:31:56,641 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:56,641 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:56,641 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:56,642 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:56,642 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-30 00:31:56,642 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:56,642 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:56,642 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:56,642 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration2_Loop [2020-11-30 00:31:56,642 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:56,642 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:56,644 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:56,654 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:56,660 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:56,768 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:56,768 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:56,780 INFO L120 nArgumentSynthesizer]: Termination Analysis Settings: Termination analysis: LINEAR_WITH_GUESSES Number of strict supporting invariants: 0 Number of non-strict supporting invariants: 1 Consider only non-deceasing supporting invariants: true Simplify termination arguments: true Simplify supporting invariants: trueOverapproximate stem: false [2020-11-30 00:31:56,784 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:56,784 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:56,784 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:56,784 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:56,791 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-30 00:31:56,791 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:56,803 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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 [2020-11-30 00:31:56,841 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 [2020-11-30 00:31:56,843 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:56,843 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:56,843 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:56,843 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:56,846 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-30 00:31:56,847 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. [2020-11-30 00:31:56,856 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-30 00:31:56,903 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 [2020-11-30 00:31:56,905 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:56,905 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-30 00:31:56,905 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:56,905 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:56,905 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:56,907 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-30 00:31:56,907 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:56,910 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-30 00:31:56,917 INFO L443 ModelExtractionUtils]: Simplification made 4 calls to the SMT solver. [2020-11-30 00:31:56,917 INFO L444 ModelExtractionUtils]: 0 out of 4 variables were initially zero. Simplification set additionally 2 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-30 00:31:56,924 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-30 00:31:56,925 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-30 00:31:56,925 INFO L510 LassoAnalysis]: Proved termination. [2020-11-30 00:31:56,925 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~i~0) = 1*ULTIMATE.start_main_~i~0 Supporting invariants [] Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:56,963 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-30 00:31:56,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:56,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:56,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 10 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-30 00:31:56,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:31:56,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:56,996 WARN L261 TraceCheckSpWp]: Trace formula consists of 8 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 00:31:56,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:31:57,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 00:31:57,058 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 [2020-11-30 00:31:57,058 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 12 states and 18 transitions. cyclomatic complexity: 9 Second operand 4 states. [2020-11-30 00:31:57,098 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 12 states and 18 transitions. cyclomatic complexity: 9. Second operand 4 states. Result 34 states and 49 transitions. Complement of second has 7 states. [2020-11-30 00:31:57,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-30 00:31:57,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2020-11-30 00:31:57,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 8 transitions. [2020-11-30 00:31:57,101 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 8 transitions. Stem has 2 letters. Loop has 3 letters. [2020-11-30 00:31:57,102 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:57,102 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 8 transitions. Stem has 5 letters. Loop has 3 letters. [2020-11-30 00:31:57,103 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:57,103 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 8 transitions. Stem has 2 letters. Loop has 6 letters. [2020-11-30 00:31:57,103 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:57,103 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 34 states and 49 transitions. [2020-11-30 00:31:57,107 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 9 [2020-11-30 00:31:57,108 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 34 states to 30 states and 44 transitions. [2020-11-30 00:31:57,108 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 12 [2020-11-30 00:31:57,108 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 15 [2020-11-30 00:31:57,109 INFO L73 IsDeterministic]: Start isDeterministic. Operand 30 states and 44 transitions. [2020-11-30 00:31:57,109 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-30 00:31:57,109 INFO L691 BuchiCegarLoop]: Abstraction has 30 states and 44 transitions. [2020-11-30 00:31:57,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states and 44 transitions. [2020-11-30 00:31:57,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2020-11-30 00:31:57,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-30 00:31:57,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 37 transitions. [2020-11-30 00:31:57,113 INFO L714 BuchiCegarLoop]: Abstraction has 24 states and 37 transitions. [2020-11-30 00:31:57,113 INFO L594 BuchiCegarLoop]: Abstraction has 24 states and 37 transitions. [2020-11-30 00:31:57,113 INFO L427 BuchiCegarLoop]: ======== Iteration 3============ [2020-11-30 00:31:57,113 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 24 states and 37 transitions. [2020-11-30 00:31:57,118 INFO L131 ngComponentsAnalysis]: Automaton has 3 accepting balls. 9 [2020-11-30 00:31:57,119 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-30 00:31:57,119 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-30 00:31:57,119 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [1, 1, 1] [2020-11-30 00:31:57,119 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-30 00:31:57,119 INFO L794 eck$LassoCheckResult]: Stem: 160#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_#t~nondet1, main_~i~0, main_~j~0, main_~t~0;havoc main_~i~0;havoc main_~j~0;havoc main_~t~0;main_~i~0 := main_#t~nondet0;havoc main_#t~nondet0;main_~j~0 := main_#t~nondet1;havoc main_#t~nondet1;main_~t~0 := 0; 161#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 173#L14 assume !(main_~i~0 < main_~j~0); 166#L19 [2020-11-30 00:31:57,120 INFO L796 eck$LassoCheckResult]: Loop: 166#L19 assume main_~i~0 > main_~j~0;main_~j~0 := main_~i~0; 167#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 179#L14 assume !(main_~i~0 < main_~j~0); 166#L19 [2020-11-30 00:31:57,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:57,120 INFO L82 PathProgramCache]: Analyzing trace with hash 31077, now seen corresponding path program 1 times [2020-11-30 00:31:57,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:57,121 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990205117] [2020-11-30 00:31:57,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:57,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:57,139 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:57,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:57,143 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:57,144 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:57,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:57,145 INFO L82 PathProgramCache]: Analyzing trace with hash 47414, now seen corresponding path program 1 times [2020-11-30 00:31:57,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:57,145 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557011205] [2020-11-30 00:31:57,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:57,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:57,154 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:57,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:57,173 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:57,175 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:57,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:57,175 INFO L82 PathProgramCache]: Analyzing trace with hash 925832530, now seen corresponding path program 1 times [2020-11-30 00:31:57,175 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:57,176 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631803654] [2020-11-30 00:31:57,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:57,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:57,201 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:57,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:57,205 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:57,207 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:57,241 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:57,241 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:57,242 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:57,242 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:57,242 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-30 00:31:57,242 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:57,242 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:57,242 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:57,242 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration3_Loop [2020-11-30 00:31:57,242 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:57,243 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:57,244 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:57,250 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:57,255 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:57,345 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:57,345 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:57,359 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:57,359 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:57,362 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-30 00:31:57,362 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_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:57,388 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:57,388 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:57,395 INFO L437 LassoAnalysis]: Proved nontermination for one component. [2020-11-30 00:31:57,395 INFO L440 LassoAnalysis]: Non-Termination argument consisting of: Initial state: {v_rep~unnamed0~0~false_5=0} Honda state: {v_rep~unnamed0~0~false_5=0} Generalized eigenvectors: [] Lambdas: [] Nus: [] No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:57,418 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:57,418 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:57,448 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-30 00:31:57,448 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:57,585 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-30 00:31:57,587 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:57,587 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:57,587 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:57,587 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:57,587 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-30 00:31:57,587 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:57,587 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:57,587 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:57,587 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration3_Loop [2020-11-30 00:31:57,587 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:57,588 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:57,589 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:57,595 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:57,609 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:57,679 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:57,679 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:57,693 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 [2020-11-30 00:31:57,695 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:57,695 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:57,695 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:57,695 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:57,697 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-30 00:31:57,698 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 [2020-11-30 00:31:57,703 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:57,741 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 [2020-11-30 00:31:57,743 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:57,743 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-30 00:31:57,743 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:57,743 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:57,743 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:57,745 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-30 00:31:57,745 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:57,749 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-30 00:31:57,754 INFO L443 ModelExtractionUtils]: Simplification made 4 calls to the SMT solver. [2020-11-30 00:31:57,754 INFO L444 ModelExtractionUtils]: 0 out of 4 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:57,759 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-30 00:31:57,759 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-30 00:31:57,759 INFO L510 LassoAnalysis]: Proved termination. [2020-11-30 00:31:57,760 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~i~0, ULTIMATE.start_main_~j~0) = 1*ULTIMATE.start_main_~i~0 - 1*ULTIMATE.start_main_~j~0 Supporting invariants [] Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:57,798 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-30 00:31:57,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:57,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:57,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 11 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-30 00:31:57,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:31:57,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:57,833 WARN L261 TraceCheckSpWp]: Trace formula consists of 8 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 00:31:57,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:31:57,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 00:31:57,859 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 [2020-11-30 00:31:57,859 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 24 states and 37 transitions. cyclomatic complexity: 19 Second operand 3 states. [2020-11-30 00:31:57,889 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 24 states and 37 transitions. cyclomatic complexity: 19. Second operand 3 states. Result 62 states and 91 transitions. Complement of second has 5 states. [2020-11-30 00:31:57,891 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 [2020-11-30 00:31:57,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-30 00:31:57,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 11 transitions. [2020-11-30 00:31:57,892 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 11 transitions. Stem has 3 letters. Loop has 3 letters. [2020-11-30 00:31:57,892 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:57,893 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 11 transitions. Stem has 6 letters. Loop has 3 letters. [2020-11-30 00:31:57,893 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:57,893 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 11 transitions. Stem has 3 letters. Loop has 6 letters. [2020-11-30 00:31:57,893 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:57,894 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 62 states and 91 transitions. [2020-11-30 00:31:57,897 INFO L131 ngComponentsAnalysis]: Automaton has 4 accepting balls. 12 [2020-11-30 00:31:57,904 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 62 states to 55 states and 80 transitions. [2020-11-30 00:31:57,904 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 19 [2020-11-30 00:31:57,905 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 22 [2020-11-30 00:31:57,905 INFO L73 IsDeterministic]: Start isDeterministic. Operand 55 states and 80 transitions. [2020-11-30 00:31:57,905 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-30 00:31:57,905 INFO L691 BuchiCegarLoop]: Abstraction has 55 states and 80 transitions. [2020-11-30 00:31:57,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states and 80 transitions. [2020-11-30 00:31:57,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 41. [2020-11-30 00:31:57,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-11-30 00:31:57,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 60 transitions. [2020-11-30 00:31:57,913 INFO L714 BuchiCegarLoop]: Abstraction has 41 states and 60 transitions. [2020-11-30 00:31:57,913 INFO L594 BuchiCegarLoop]: Abstraction has 41 states and 60 transitions. [2020-11-30 00:31:57,913 INFO L427 BuchiCegarLoop]: ======== Iteration 4============ [2020-11-30 00:31:57,913 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 41 states and 60 transitions. [2020-11-30 00:31:57,915 INFO L131 ngComponentsAnalysis]: Automaton has 4 accepting balls. 12 [2020-11-30 00:31:57,915 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-30 00:31:57,915 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-30 00:31:57,916 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1] [2020-11-30 00:31:57,916 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1] [2020-11-30 00:31:57,916 INFO L794 eck$LassoCheckResult]: Stem: 285#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_#t~nondet1, main_~i~0, main_~j~0, main_~t~0;havoc main_~i~0;havoc main_~j~0;havoc main_~t~0;main_~i~0 := main_#t~nondet0;havoc main_#t~nondet0;main_~j~0 := main_#t~nondet1;havoc main_#t~nondet1;main_~t~0 := 0; 286#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 316#L14 assume !(main_~i~0 < main_~j~0); 291#L19 assume main_~i~0 > main_~j~0;main_~j~0 := main_~i~0; 292#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 304#L14 assume main_~i~0 < main_~j~0;main_~t~0 := main_~i~0;main_~i~0 := main_~j~0;main_~j~0 := main_~t~0; 299#L19-2 [2020-11-30 00:31:57,916 INFO L796 eck$LassoCheckResult]: Loop: 299#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 309#L14 assume main_~i~0 < main_~j~0;main_~t~0 := main_~i~0;main_~i~0 := main_~j~0;main_~j~0 := main_~t~0; 299#L19-2 [2020-11-30 00:31:57,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:57,917 INFO L82 PathProgramCache]: Analyzing trace with hash 925832528, now seen corresponding path program 1 times [2020-11-30 00:31:57,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:57,917 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888484969] [2020-11-30 00:31:57,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:57,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:57,968 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 00:31:57,968 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888484969] [2020-11-30 00:31:57,969 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 00:31:57,969 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 00:31:57,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858753444] [2020-11-30 00:31:57,972 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-11-30 00:31:57,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:57,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1284, now seen corresponding path program 2 times [2020-11-30 00:31:57,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:57,973 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243188087] [2020-11-30 00:31:57,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:57,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:57,978 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:57,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:57,981 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:57,982 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:58,020 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:58,020 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:58,020 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:58,020 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:58,021 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-30 00:31:58,021 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:58,021 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:58,021 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:58,021 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration4_Loop [2020-11-30 00:31:58,021 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:58,021 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:58,022 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:58,045 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:58,049 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:58,125 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:58,125 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:58,131 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:58,131 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 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:58,182 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-30 00:31:58,182 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:59,256 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-30 00:31:59,258 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:59,258 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:59,258 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:59,258 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:59,258 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-30 00:31:59,258 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:59,258 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:59,258 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:59,258 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration4_Loop [2020-11-30 00:31:59,258 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:59,258 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:59,260 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,320 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,323 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,383 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:59,383 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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) [2020-11-30 00:31:59,391 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 [2020-11-30 00:31:59,393 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:59,393 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-30 00:31:59,394 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:59,394 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:59,394 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:59,396 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-30 00:31:59,396 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:59,400 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-30 00:31:59,405 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-30 00:31:59,406 INFO L444 ModelExtractionUtils]: 2 out of 5 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-30 00:31:59,410 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-30 00:31:59,410 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-30 00:31:59,410 INFO L510 LassoAnalysis]: Proved termination. [2020-11-30 00:31:59,410 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~j~0) = 1*ULTIMATE.start_main_~j~0 Supporting invariants [] Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:59,442 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-30 00:31:59,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:59,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:59,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-30 00:31:59,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:31:59,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:59,487 WARN L261 TraceCheckSpWp]: Trace formula consists of 11 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 00:31:59,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:31:59,501 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 00:31:59,502 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 [2020-11-30 00:31:59,502 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 41 states and 60 transitions. cyclomatic complexity: 29 Second operand 3 states. [2020-11-30 00:31:59,529 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 41 states and 60 transitions. cyclomatic complexity: 29. Second operand 3 states. Result 73 states and 104 transitions. Complement of second has 7 states. [2020-11-30 00:31:59,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: Buchi interpolant automaton has 4 states 1 stem states 2 non-accepting loop states 1 accepting loop states [2020-11-30 00:31:59,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-30 00:31:59,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 11 transitions. [2020-11-30 00:31:59,531 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 11 transitions. Stem has 6 letters. Loop has 2 letters. [2020-11-30 00:31:59,531 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:59,531 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 11 transitions. Stem has 8 letters. Loop has 2 letters. [2020-11-30 00:31:59,531 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:59,531 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 4 states and 11 transitions. Stem has 6 letters. Loop has 4 letters. [2020-11-30 00:31:59,531 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:31:59,531 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 73 states and 104 transitions. [2020-11-30 00:31:59,534 INFO L131 ngComponentsAnalysis]: Automaton has 5 accepting balls. 15 [2020-11-30 00:31:59,535 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 73 states to 57 states and 83 transitions. [2020-11-30 00:31:59,535 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 23 [2020-11-30 00:31:59,536 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 24 [2020-11-30 00:31:59,536 INFO L73 IsDeterministic]: Start isDeterministic. Operand 57 states and 83 transitions. [2020-11-30 00:31:59,536 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-30 00:31:59,536 INFO L691 BuchiCegarLoop]: Abstraction has 57 states and 83 transitions. [2020-11-30 00:31:59,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states and 83 transitions. [2020-11-30 00:31:59,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 42. [2020-11-30 00:31:59,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-30 00:31:59,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 62 transitions. [2020-11-30 00:31:59,541 INFO L714 BuchiCegarLoop]: Abstraction has 42 states and 62 transitions. [2020-11-30 00:31:59,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:31:59,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 00:31:59,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 00:31:59,553 INFO L87 Difference]: Start difference. First operand 42 states and 62 transitions. Second operand 3 states. [2020-11-30 00:31:59,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:31:59,609 INFO L93 Difference]: Finished difference Result 51 states and 69 transitions. [2020-11-30 00:31:59,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 00:31:59,609 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 51 states and 69 transitions. [2020-11-30 00:31:59,610 INFO L131 ngComponentsAnalysis]: Automaton has 4 accepting balls. 15 [2020-11-30 00:31:59,611 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 51 states to 46 states and 63 transitions. [2020-11-30 00:31:59,612 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 23 [2020-11-30 00:31:59,612 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 23 [2020-11-30 00:31:59,612 INFO L73 IsDeterministic]: Start isDeterministic. Operand 46 states and 63 transitions. [2020-11-30 00:31:59,612 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-30 00:31:59,612 INFO L691 BuchiCegarLoop]: Abstraction has 46 states and 63 transitions. [2020-11-30 00:31:59,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states and 63 transitions. [2020-11-30 00:31:59,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-11-30 00:31:59,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-11-30 00:31:59,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 61 transitions. [2020-11-30 00:31:59,616 INFO L714 BuchiCegarLoop]: Abstraction has 44 states and 61 transitions. [2020-11-30 00:31:59,616 INFO L594 BuchiCegarLoop]: Abstraction has 44 states and 61 transitions. [2020-11-30 00:31:59,617 INFO L427 BuchiCegarLoop]: ======== Iteration 5============ [2020-11-30 00:31:59,617 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 44 states and 61 transitions. [2020-11-30 00:31:59,618 INFO L131 ngComponentsAnalysis]: Automaton has 4 accepting balls. 15 [2020-11-30 00:31:59,618 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-30 00:31:59,618 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-30 00:31:59,618 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1] [2020-11-30 00:31:59,618 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [1, 1, 1] [2020-11-30 00:31:59,618 INFO L794 eck$LassoCheckResult]: Stem: 539#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_#t~nondet1, main_~i~0, main_~j~0, main_~t~0;havoc main_~i~0;havoc main_~j~0;havoc main_~t~0;main_~i~0 := main_#t~nondet0;havoc main_#t~nondet0;main_~j~0 := main_#t~nondet1;havoc main_#t~nondet1;main_~t~0 := 0; 540#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 567#L14 assume main_~i~0 < main_~j~0;main_~t~0 := main_~i~0;main_~i~0 := main_~j~0;main_~j~0 := main_~t~0; 568#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 570#L14 assume !(main_~i~0 < main_~j~0); 581#L19 assume !(main_~i~0 > main_~j~0);main_~i~0 := main_~i~0 - 1; 541#L19-2 [2020-11-30 00:31:59,618 INFO L796 eck$LassoCheckResult]: Loop: 541#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 542#L14 assume !(main_~i~0 < main_~j~0); 545#L19 assume !(main_~i~0 > main_~j~0);main_~i~0 := main_~i~0 - 1; 541#L19-2 [2020-11-30 00:31:59,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:59,619 INFO L82 PathProgramCache]: Analyzing trace with hash 925765420, now seen corresponding path program 1 times [2020-11-30 00:31:59,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:59,619 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964797078] [2020-11-30 00:31:59,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:59,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:31:59,645 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 00:31:59,646 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964797078] [2020-11-30 00:31:59,646 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 00:31:59,646 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 00:31:59,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477024270] [2020-11-30 00:31:59,646 INFO L799 eck$LassoCheckResult]: stem already infeasible [2020-11-30 00:31:59,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:31:59,647 INFO L82 PathProgramCache]: Analyzing trace with hash 39886, now seen corresponding path program 2 times [2020-11-30 00:31:59,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:31:59,647 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751865367] [2020-11-30 00:31:59,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:31:59,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:59,651 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:59,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:31:59,653 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:31:59,653 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:31:59,689 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:59,689 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:59,689 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:59,689 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:59,689 INFO L129 ssoRankerPreferences]: Use exernal solver: true [2020-11-30 00:31:59,689 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:59,689 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:59,690 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:59,690 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration5_Loop [2020-11-30 00:31:59,690 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:59,690 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:59,691 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,703 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,711 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,757 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:59,757 INFO L404 LassoAnalysis]: Checking for nontermination... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/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 [2020-11-30 00:31:59,764 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 0 Nilpotent components: true [2020-11-30 00:31:59,764 INFO L160 nArgumentSynthesizer]: Using integer mode. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:59,792 INFO L148 nArgumentSynthesizer]: Nontermination analysis: NONLINEAR Allow bounded executions: true Number of generalized eigenvectors: 3 Nilpotent components: true [2020-11-30 00:31:59,792 INFO L160 nArgumentSynthesizer]: Using integer mode. [2020-11-30 00:31:59,827 INFO L444 LassoAnalysis]: Proving nontermination failed: No geometric nontermination argument exists. [2020-11-30 00:31:59,829 INFO L210 LassoAnalysis]: Preferences: [2020-11-30 00:31:59,829 INFO L126 ssoRankerPreferences]: Compute integeral hull: false [2020-11-30 00:31:59,829 INFO L127 ssoRankerPreferences]: Enable LassoPartitioneer: true [2020-11-30 00:31:59,829 INFO L128 ssoRankerPreferences]: Term annotations enabled: false [2020-11-30 00:31:59,829 INFO L129 ssoRankerPreferences]: Use exernal solver: false [2020-11-30 00:31:59,829 INFO L130 ssoRankerPreferences]: SMT solver command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:59,829 INFO L131 ssoRankerPreferences]: Dump SMT script to file: false [2020-11-30 00:31:59,829 INFO L132 ssoRankerPreferences]: Path of dumped script: [2020-11-30 00:31:59,829 INFO L133 ssoRankerPreferences]: Filename of dumped script: Flip2.c_Iteration5_Loop [2020-11-30 00:31:59,829 INFO L134 ssoRankerPreferences]: MapElimAlgo: Frank [2020-11-30 00:31:59,829 INFO L274 LassoAnalysis]: Starting lasso preprocessing... [2020-11-30 00:31:59,830 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,849 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,857 INFO L141 MapEliminator]: Using MapEliminator with SimplificationTechnique=SIMPLIFY_DDA XnfConversionTechnique=BOTTOM_UP_WITH_LOCAL_SIMPLIFICATION AddInequalities=false OnlyTrivialImplicationsArrayWrite=true OnlyTrivialImplicationsForModifiedArguments=true OnlyArgumentsInFormula=true [2020-11-30 00:31:59,900 INFO L292 LassoAnalysis]: Preprocessing complete. [2020-11-30 00:31:59,901 INFO L489 LassoAnalysis]: Using template 'affine'. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-30 00:31:59,911 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 [2020-11-30 00:31:59,913 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:59,913 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:59,913 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:59,913 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:59,916 INFO L401 nArgumentSynthesizer]: We have 6 Motzkin's Theorem applications. [2020-11-30 00:31:59,916 INFO L402 nArgumentSynthesizer]: A total of 2 supporting invariants were added. Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:59,920 INFO L522 LassoAnalysis]: Proving termination failed for this template and these settings. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-30 00:31:59,962 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 [2020-11-30 00:31:59,964 INFO L338 nArgumentSynthesizer]: Template has degree 0. [2020-11-30 00:31:59,964 INFO L351 nArgumentSynthesizer]: There is no stem transition; disabling supporting invariant generation. [2020-11-30 00:31:59,964 INFO L203 nArgumentSynthesizer]: 1 stem disjuncts [2020-11-30 00:31:59,964 INFO L204 nArgumentSynthesizer]: 1 loop disjuncts [2020-11-30 00:31:59,964 INFO L205 nArgumentSynthesizer]: 2 template conjuncts. [2020-11-30 00:31:59,966 INFO L401 nArgumentSynthesizer]: We have 2 Motzkin's Theorem applications. [2020-11-30 00:31:59,966 INFO L402 nArgumentSynthesizer]: A total of 0 supporting invariants were added. Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:31:59,969 INFO L420 nArgumentSynthesizer]: Found a termination argument, trying to simplify. [2020-11-30 00:31:59,974 INFO L443 ModelExtractionUtils]: Simplification made 3 calls to the SMT solver. [2020-11-30 00:31:59,974 INFO L444 ModelExtractionUtils]: 1 out of 4 variables were initially zero. Simplification set additionally 1 variables to zero. No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2020-11-30 00:31:59,978 INFO L435 nArgumentSynthesizer]: Simplifying supporting invariants... [2020-11-30 00:31:59,978 INFO L438 nArgumentSynthesizer]: Removed 0 redundant supporting invariants from a total of 0. [2020-11-30 00:31:59,979 INFO L510 LassoAnalysis]: Proved termination. [2020-11-30 00:31:59,979 INFO L512 LassoAnalysis]: Termination argument consisting of: Ranking function f(ULTIMATE.start_main_~i~0) = 1*ULTIMATE.start_main_~i~0 Supporting invariants [] Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2020-11-30 00:32:00,006 INFO L297 tatePredicateManager]: 0 out of 0 supporting invariants were superfluous and have been removed [2020-11-30 00:32:00,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:32:00,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:32:00,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 2 conjunts are in the unsatisfiable core [2020-11-30 00:32:00,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:32:00,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 00:32:00,049 WARN L261 TraceCheckSpWp]: Trace formula consists of 8 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 00:32:00,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 00:32:00,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 00:32:00,074 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 [2020-11-30 00:32:00,074 INFO L71 iDifferenceNCSBLazy3]: Start buchiDifferenceNCSBLazy3. First operand 44 states and 61 transitions. cyclomatic complexity: 26 Second operand 3 states. [2020-11-30 00:32:00,148 INFO L75 iDifferenceNCSBLazy3]: Finished buchiDifferenceNCSBLazy3. First operand 44 states and 61 transitions. cyclomatic complexity: 26. Second operand 3 states. Result 81 states and 106 transitions. Complement of second has 5 states. [2020-11-30 00:32:00,158 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 [2020-11-30 00:32:00,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2020-11-30 00:32:00,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 11 transitions. [2020-11-30 00:32:00,159 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 11 transitions. Stem has 6 letters. Loop has 3 letters. [2020-11-30 00:32:00,159 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:32:00,159 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 11 transitions. Stem has 9 letters. Loop has 3 letters. [2020-11-30 00:32:00,159 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:32:00,159 INFO L84 BuchiAccepts]: Start buchiAccepts Operand 3 states and 11 transitions. Stem has 6 letters. Loop has 6 letters. [2020-11-30 00:32:00,160 INFO L116 BuchiAccepts]: Finished buchiAccepts. [2020-11-30 00:32:00,160 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 81 states and 106 transitions. [2020-11-30 00:32:00,161 INFO L131 ngComponentsAnalysis]: Automaton has 2 accepting balls. 9 [2020-11-30 00:32:00,161 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 81 states to 60 states and 81 transitions. [2020-11-30 00:32:00,162 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 19 [2020-11-30 00:32:00,162 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 21 [2020-11-30 00:32:00,162 INFO L73 IsDeterministic]: Start isDeterministic. Operand 60 states and 81 transitions. [2020-11-30 00:32:00,162 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-30 00:32:00,162 INFO L691 BuchiCegarLoop]: Abstraction has 60 states and 81 transitions. [2020-11-30 00:32:00,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states and 81 transitions. [2020-11-30 00:32:00,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 50. [2020-11-30 00:32:00,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-30 00:32:00,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 69 transitions. [2020-11-30 00:32:00,165 INFO L714 BuchiCegarLoop]: Abstraction has 50 states and 69 transitions. [2020-11-30 00:32:00,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-30 00:32:00,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 00:32:00,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 00:32:00,166 INFO L87 Difference]: Start difference. First operand 50 states and 69 transitions. Second operand 3 states. [2020-11-30 00:32:00,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 00:32:00,184 INFO L93 Difference]: Finished difference Result 53 states and 67 transitions. [2020-11-30 00:32:00,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 00:32:00,184 INFO L82 GeneralOperation]: Start removeNonLiveStates. Operand 53 states and 67 transitions. [2020-11-30 00:32:00,185 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 9 [2020-11-30 00:32:00,186 INFO L88 GeneralOperation]: Finished removeNonLiveStates. Reduced from 53 states to 49 states and 62 transitions. [2020-11-30 00:32:00,186 INFO L87 BuchiClosureNwa]: Accepting states before buchiClosure: 23 [2020-11-30 00:32:00,186 INFO L106 BuchiClosureNwa]: Accepting states after buchiClosure: 26 [2020-11-30 00:32:00,187 INFO L73 IsDeterministic]: Start isDeterministic. Operand 49 states and 62 transitions. [2020-11-30 00:32:00,187 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is not deterministic. [2020-11-30 00:32:00,187 INFO L691 BuchiCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-11-30 00:32:00,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states and 62 transitions. [2020-11-30 00:32:00,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 37. [2020-11-30 00:32:00,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-11-30 00:32:00,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2020-11-30 00:32:00,190 INFO L714 BuchiCegarLoop]: Abstraction has 37 states and 48 transitions. [2020-11-30 00:32:00,190 INFO L594 BuchiCegarLoop]: Abstraction has 37 states and 48 transitions. [2020-11-30 00:32:00,190 INFO L427 BuchiCegarLoop]: ======== Iteration 6============ [2020-11-30 00:32:00,191 INFO L72 BuchiIsEmpty]: Start buchiIsEmpty. Operand 37 states and 48 transitions. [2020-11-30 00:32:00,191 INFO L131 ngComponentsAnalysis]: Automaton has 1 accepting balls. 9 [2020-11-30 00:32:00,191 INFO L87 BuchiIsEmpty]: Finished buchiIsEmpty Result is false [2020-11-30 00:32:00,191 INFO L119 BuchiIsEmpty]: Starting construction of run [2020-11-30 00:32:00,192 INFO L852 BuchiCegarLoop]: Counterexample stem histogram [2, 1, 1, 1, 1] [2020-11-30 00:32:00,192 INFO L853 BuchiCegarLoop]: Counterexample loop histogram [3, 2, 1, 1, 1] [2020-11-30 00:32:00,192 INFO L794 eck$LassoCheckResult]: Stem: 814#ULTIMATE.startENTRY havoc main_#res;havoc main_#t~nondet0, main_#t~nondet1, main_~i~0, main_~j~0, main_~t~0;havoc main_~i~0;havoc main_~j~0;havoc main_~t~0;main_~i~0 := main_#t~nondet0;havoc main_#t~nondet0;main_~j~0 := main_#t~nondet1;havoc main_#t~nondet1;main_~t~0 := 0; 815#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 835#L14 assume !(main_~i~0 < main_~j~0); 823#L19 assume !(main_~i~0 > main_~j~0);main_~i~0 := main_~i~0 - 1; 824#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 817#L14 assume main_~i~0 < main_~j~0;main_~t~0 := main_~i~0;main_~i~0 := main_~j~0;main_~j~0 := main_~t~0; 828#L19-2 [2020-11-30 00:32:00,192 INFO L796 eck$LassoCheckResult]: Loop: 828#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 826#L14 assume !(main_~i~0 < main_~j~0); 827#L19 assume main_~i~0 > main_~j~0;main_~j~0 := main_~i~0; 838#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 841#L14 assume !(main_~i~0 < main_~j~0); 821#L19 assume !(main_~i~0 > main_~j~0);main_~i~0 := main_~i~0 - 1; 822#L19-2 assume !!(main_~i~0 > 0 && main_~j~0 > 0); 840#L14 assume main_~i~0 < main_~j~0;main_~t~0 := main_~i~0;main_~i~0 := main_~j~0;main_~j~0 := main_~t~0; 828#L19-2 [2020-11-30 00:32:00,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:32:00,193 INFO L82 PathProgramCache]: Analyzing trace with hash 925834450, now seen corresponding path program 2 times [2020-11-30 00:32:00,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:32:00,193 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949546760] [2020-11-30 00:32:00,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:32:00,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:32:00,200 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:32:00,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:32:00,205 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:32:00,206 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:32:00,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:32:00,207 INFO L82 PathProgramCache]: Analyzing trace with hash -606540634, now seen corresponding path program 1 times [2020-11-30 00:32:00,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:32:00,208 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629266556] [2020-11-30 00:32:00,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:32:00,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:32:00,214 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:32:00,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:32:00,220 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:32:00,221 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:32:00,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 00:32:00,222 INFO L82 PathProgramCache]: Analyzing trace with hash -66410377, now seen corresponding path program 1 times [2020-11-30 00:32:00,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-30 00:32:00,222 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825364880] [2020-11-30 00:32:00,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 00:32:00,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:32:00,233 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:32:00,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 00:32:00,243 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 00:32:00,246 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-30 00:32:00,423 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.buchiautomizer CFG 30.11 12:32:00 BoogieIcfgContainer [2020-11-30 00:32:00,423 INFO L132 PluginConnector]: ------------------------ END BuchiAutomizer---------------------------- [2020-11-30 00:32:00,424 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 00:32:00,424 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 00:32:00,424 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 00:32:00,425 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 12:31:54" (3/4) ... [2020-11-30 00:32:00,427 INFO L134 WitnessPrinter]: Generating witness for non-termination counterexample [2020-11-30 00:32:00,490 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_96ec26d6-4a08-417d-a3b2-4d789cef29a5/bin/uautomizer/witness.graphml [2020-11-30 00:32:00,490 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 00:32:00,492 INFO L168 Benchmark]: Toolchain (without parser) took 6527.77 ms. Allocated memory was 86.0 MB in the beginning and 125.8 MB in the end (delta: 39.8 MB). Free memory was 56.8 MB in the beginning and 70.8 MB in the end (delta: -14.0 MB). Peak memory consumption was 26.0 MB. Max. memory is 16.1 GB. [2020-11-30 00:32:00,492 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 86.0 MB. Free memory was 44.9 MB in the beginning and 44.9 MB in the end (delta: 34.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 00:32:00,493 INFO L168 Benchmark]: CACSL2BoogieTranslator took 247.73 ms. Allocated memory is still 86.0 MB. Free memory was 56.6 MB in the beginning and 65.5 MB in the end (delta: -8.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 00:32:00,494 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.59 ms. Allocated memory is still 86.0 MB. Free memory was 65.5 MB in the beginning and 64.2 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 00:32:00,494 INFO L168 Benchmark]: Boogie Preprocessor took 18.48 ms. Allocated memory is still 86.0 MB. Free memory was 64.2 MB in the beginning and 63.3 MB in the end (delta: 955.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 00:32:00,496 INFO L168 Benchmark]: RCFGBuilder took 204.64 ms. Allocated memory is still 86.0 MB. Free memory was 63.3 MB in the beginning and 54.9 MB in the end (delta: 8.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 00:32:00,498 INFO L168 Benchmark]: BuchiAutomizer took 5935.63 ms. Allocated memory was 86.0 MB in the beginning and 125.8 MB in the end (delta: 39.8 MB). Free memory was 54.9 MB in the beginning and 72.8 MB in the end (delta: -18.0 MB). Peak memory consumption was 24.8 MB. Max. memory is 16.1 GB. [2020-11-30 00:32:00,499 INFO L168 Benchmark]: Witness Printer took 66.76 ms. Allocated memory is still 125.8 MB. Free memory was 72.8 MB in the beginning and 70.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 00:32:00,502 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 86.0 MB. Free memory was 44.9 MB in the beginning and 44.9 MB in the end (delta: 34.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 247.73 ms. Allocated memory is still 86.0 MB. Free memory was 56.6 MB in the beginning and 65.5 MB in the end (delta: -8.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 40.59 ms. Allocated memory is still 86.0 MB. Free memory was 65.5 MB in the beginning and 64.2 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.48 ms. Allocated memory is still 86.0 MB. Free memory was 64.2 MB in the beginning and 63.3 MB in the end (delta: 955.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 204.64 ms. Allocated memory is still 86.0 MB. Free memory was 63.3 MB in the beginning and 54.9 MB in the end (delta: 8.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * BuchiAutomizer took 5935.63 ms. Allocated memory was 86.0 MB in the beginning and 125.8 MB in the end (delta: 39.8 MB). Free memory was 54.9 MB in the beginning and 72.8 MB in the end (delta: -18.0 MB). Peak memory consumption was 24.8 MB. Max. memory is 16.1 GB. * Witness Printer took 66.76 ms. Allocated memory is still 125.8 MB. Free memory was 72.8 MB in the beginning and 70.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. 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 7 terminating modules (2 trivial, 5 deterministic, 0 nondeterministic) and one nonterminating remainder module.One deterministic module has affine ranking function j and consists of 5 locations. One deterministic module has affine ranking function i and consists of 4 locations. One deterministic module has affine ranking function i + -1 * j and consists of 3 locations. One deterministic module has affine ranking function j and consists of 4 locations. One deterministic module has affine ranking function i and consists of 3 locations. 2 modules have a trivial ranking function, the largest among these consists of 3 locations. The remainder module has 37 locations. - StatisticsResult: Timing statistics BüchiAutomizer plugin needed 5.8s and 6 iterations. TraceHistogramMax:3. Analysis of lassos took 4.9s. Construction of modules took 0.1s. Büchi inclusion checks took 0.5s. Highest rank in rank-based complementation 3. Minimization of det autom 0. Minimization of nondet autom 7. Automata minimization 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 60 StatesRemovedByMinimization, 7 NontrivialMinimizations. Non-live state removal took 0.0s Buchi closure took 0.0s. Biggest automaton had 44 states and ocurred in iteration 4. Nontrivial modules had stage [5, 0, 0, 0, 0]. InterpolantCoveringCapabilityFinite: 0/0 InterpolantCoveringCapabilityBuchi: 0/0 HoareTripleCheckerStatistics: 34 SDtfs, 33 SDslu, 6 SDs, 0 SdLazy, 81 SolverSat, 14 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time LassoAnalysisResults: nont1 unkn0 SFLI0 SFLT3 conc0 concLT0 SILN0 SILU0 SILI0 SILT2 lasso0 LassoPreprocessingBenchmarks: Lassos: inital16 mio100 ax176 hnf97 lsp55 ukn100 mio100 lsp100 div100 bol100 ite100 ukn100 eq150 hnf92 smp100 dnf100 smp100 tf109 neg100 sie114 LassoTerminationAnalysisBenchmarks: ConstraintsSatisfiability: unsat Degree: 0 Time: 36ms VariablesStem: 1 VariablesLoop: 0 DisjunctsStem: 1 DisjunctsLoop: 1 SupportingInvariants: 2 MotzkinApplications: 6 LassoTerminationAnalysisBenchmarks: LassoNonterminationAnalysisSatFixpoint: 6 LassoNonterminationAnalysisSatUnbounded: 0 LassoNonterminationAnalysisUnsat: 5 LassoNonterminationAnalysisUnknown: 0 LassoNonterminationAnalysisTime: 1.9s - TerminationAnalysisResult: Nontermination possible Buchi Automizer proved that your program is nonterminating for some inputs - FixpointNonTerminationResult [Line: 13]: Nontermination argument in form of an infinite program execution. Nontermination argument in form of an infinite execution State at position 0 is {} State at position 1 is {t=1, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@1cdd5660=0, \result=0, org.eclipse.cdt.internal.core.dom.parser.c.CASTFunctionCallExpression@3051468=0, i=2, j=1} - StatisticsResult: NonterminationArgumentStatistics Fixpoint - NonterminatingLassoResult [Line: 13]: Nonterminating execution Found a nonterminating execution for the following lasso shaped sequence of statements. Stem: [L6] int i; [L7] int j; [L8] int t; [L9] i = __VERIFIER_nondet_int() [L10] j = __VERIFIER_nondet_int() [L11] t = 0 [L13] COND TRUE i > 0 && j > 0 [L14] COND FALSE !(i < j) [L19] COND FALSE !(i > j) [L22] i = i-1 [L13] COND TRUE i > 0 && j > 0 [L14] COND TRUE i < j [L15] t = i [L16] i = j [L17] j = t Loop: [L13] COND TRUE i > 0 && j > 0 [L14] COND FALSE !(i < j) [L19] COND TRUE i > j [L20] j = i [L13] COND TRUE i > 0 && j > 0 [L14] COND FALSE !(i < j) [L19] COND FALSE !(i > j) [L22] i = i-1 [L13] COND TRUE i > 0 && j > 0 [L14] COND TRUE i < j [L15] t = i [L16] i = j [L17] j = t End of lasso representation. RESULT: Ultimate proved your program to be incorrect! Received shutdown request...