./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Fibonacci01-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci01-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a7a7e948458662610557b74203cf7c9c5c696340 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-28 07:43:51,241 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:43:51,245 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:43:51,301 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:43:51,302 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:43:51,307 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:43:51,310 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:43:51,314 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:43:51,317 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:43:51,323 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:43:51,324 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:43:51,326 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:43:51,327 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:43:51,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:43:51,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:43:51,334 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:43:51,335 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:43:51,340 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:43:51,343 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:43:51,354 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:43:51,356 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:43:51,358 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:43:51,361 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:43:51,362 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:43:51,371 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:43:51,371 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:43:51,372 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:43:51,374 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:43:51,375 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:43:51,376 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:43:51,377 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:43:51,378 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:43:51,380 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:43:51,381 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:43:51,383 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:43:51,383 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:43:51,384 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:43:51,385 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:43:51,385 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:43:51,386 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:43:51,387 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:43:51,390 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-28 07:43:51,431 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:43:51,431 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:43:51,433 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:43:51,433 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:43:51,433 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:43:51,433 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:43:51,434 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:43:51,434 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:43:51,434 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:43:51,434 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:43:51,436 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:43:51,436 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:43:51,436 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:43:51,437 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:43:51,437 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:43:51,438 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:43:51,438 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:43:51,438 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:43:51,438 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:43:51,439 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:43:51,439 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:43:51,439 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:43:51,439 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:43:51,439 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:43:51,440 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:43:51,440 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:43:51,440 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:43:51,440 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:43:51,441 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:43:51,443 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:43:51,443 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:43:51,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:43:51,444 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:43:51,444 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:43:51,444 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:43:51,444 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:43:51,444 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:43:51,445 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:43:51,445 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:43:51,445 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:43:51,445 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a7a7e948458662610557b74203cf7c9c5c696340 [2020-11-28 07:43:51,723 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:43:51,756 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:43:51,759 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:43:51,760 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:43:51,761 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:43:51,762 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/../../sv-benchmarks/c/recursive/Fibonacci01-1.c [2020-11-28 07:43:51,827 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/data/98a36774b/df6c869080e145c9a65cb8e61c6147c6/FLAG243b6e282 [2020-11-28 07:43:52,265 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:43:52,266 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/sv-benchmarks/c/recursive/Fibonacci01-1.c [2020-11-28 07:43:52,285 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/data/98a36774b/df6c869080e145c9a65cb8e61c6147c6/FLAG243b6e282 [2020-11-28 07:43:52,642 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/data/98a36774b/df6c869080e145c9a65cb8e61c6147c6 [2020-11-28 07:43:52,646 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:43:52,648 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:43:52,653 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:43:52,653 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:43:52,657 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:43:52,658 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,661 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f5c8a6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52, skipping insertion in model container [2020-11-28 07:43:52,661 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,668 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:43:52,693 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:43:52,863 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:43:52,872 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:43:52,888 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:43:52,906 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:43:52,907 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52 WrapperNode [2020-11-28 07:43:52,907 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:43:52,908 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:43:52,908 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:43:52,909 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:43:52,919 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,927 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,945 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:43:52,947 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:43:52,947 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:43:52,948 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:43:52,956 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,957 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,966 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,971 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,974 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,976 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,978 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... [2020-11-28 07:43:52,979 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:43:52,980 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:43:52,981 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:43:52,981 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:43:52,984 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:43:53,062 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-11-28 07:43:53,062 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-11-28 07:43:53,062 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:43:53,063 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:43:53,063 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 07:43:53,063 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:43:53,373 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:43:53,373 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-28 07:43:53,375 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:53 BoogieIcfgContainer [2020-11-28 07:43:53,375 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:43:53,377 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:43:53,377 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:43:53,397 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:43:53,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:43:52" (1/3) ... [2020-11-28 07:43:53,398 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d6c1745 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:43:53, skipping insertion in model container [2020-11-28 07:43:53,398 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:43:52" (2/3) ... [2020-11-28 07:43:53,398 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d6c1745 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:43:53, skipping insertion in model container [2020-11-28 07:43:53,399 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:53" (3/3) ... [2020-11-28 07:43:53,400 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2020-11-28 07:43:53,415 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:43:53,420 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:43:53,431 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:43:53,453 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:43:53,453 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:43:53,453 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:43:53,453 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:43:53,453 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:43:53,453 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:43:53,453 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:43:53,453 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:43:53,468 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-11-28 07:43:53,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 07:43:53,473 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:53,474 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:53,474 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:53,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:53,480 INFO L82 PathProgramCache]: Analyzing trace with hash 1875978907, now seen corresponding path program 1 times [2020-11-28 07:43:53,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:53,491 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530101673] [2020-11-28 07:43:53,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:53,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:53,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:53,781 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530101673] [2020-11-28 07:43:53,782 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:53,782 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-28 07:43:53,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96842014] [2020-11-28 07:43:53,788 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 07:43:53,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:53,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 07:43:53,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-28 07:43:53,808 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 6 states. [2020-11-28 07:43:53,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:53,980 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2020-11-28 07:43:53,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:43:53,983 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2020-11-28 07:43:53,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:53,999 INFO L225 Difference]: With dead ends: 28 [2020-11-28 07:43:53,999 INFO L226 Difference]: Without dead ends: 18 [2020-11-28 07:43:54,002 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-11-28 07:43:54,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-11-28 07:43:54,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-11-28 07:43:54,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-28 07:43:54,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-11-28 07:43:54,040 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2020-11-28 07:43:54,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:54,040 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-11-28 07:43:54,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 07:43:54,041 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-11-28 07:43:54,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-28 07:43:54,042 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:54,042 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:54,043 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:43:54,043 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:54,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:54,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1284688169, now seen corresponding path program 1 times [2020-11-28 07:43:54,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:54,044 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388763588] [2020-11-28 07:43:54,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:54,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:54,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:43:54,142 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388763588] [2020-11-28 07:43:54,143 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:43:54,143 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-28 07:43:54,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570820301] [2020-11-28 07:43:54,144 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 07:43:54,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:54,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 07:43:54,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-28 07:43:54,146 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 6 states. [2020-11-28 07:43:54,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:54,291 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2020-11-28 07:43:54,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:43:54,293 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-11-28 07:43:54,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:54,294 INFO L225 Difference]: With dead ends: 24 [2020-11-28 07:43:54,294 INFO L226 Difference]: Without dead ends: 20 [2020-11-28 07:43:54,295 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-11-28 07:43:54,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-28 07:43:54,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2020-11-28 07:43:54,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-28 07:43:54,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-11-28 07:43:54,303 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 11 [2020-11-28 07:43:54,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:54,304 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-11-28 07:43:54,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 07:43:54,304 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-11-28 07:43:54,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-28 07:43:54,306 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:54,306 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:54,306 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 07:43:54,307 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:54,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:54,310 INFO L82 PathProgramCache]: Analyzing trace with hash -920756058, now seen corresponding path program 1 times [2020-11-28 07:43:54,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:54,314 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596702540] [2020-11-28 07:43:54,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:54,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:54,429 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 07:43:54,429 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596702540] [2020-11-28 07:43:54,430 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175218082] [2020-11-28 07:43:54,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:54,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:54,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 13 conjunts are in the unsatisfiable core [2020-11-28 07:43:54,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:54,757 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 07:43:54,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:55,211 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:43:55,218 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:43:55,222 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:43:55,260 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-28 07:43:55,260 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1459386447] [2020-11-28 07:43:55,287 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:43:55,287 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:55,294 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:43:55,297 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:55,297 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 11] total 20 [2020-11-28 07:43:55,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287638358] [2020-11-28 07:43:55,298 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-11-28 07:43:55,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:55,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-11-28 07:43:55,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2020-11-28 07:43:55,301 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 20 states. [2020-11-28 07:43:55,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:55,593 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2020-11-28 07:43:55,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 07:43:55,594 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 23 [2020-11-28 07:43:55,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:55,594 INFO L225 Difference]: With dead ends: 35 [2020-11-28 07:43:55,594 INFO L226 Difference]: Without dead ends: 20 [2020-11-28 07:43:55,595 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-11-28 07:43:55,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-28 07:43:55,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-11-28 07:43:55,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-11-28 07:43:55,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-11-28 07:43:55,603 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 23 [2020-11-28 07:43:55,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:55,603 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-11-28 07:43:55,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-11-28 07:43:55,604 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-11-28 07:43:55,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-11-28 07:43:55,605 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:55,605 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:55,805 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-28 07:43:55,806 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:55,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:55,806 INFO L82 PathProgramCache]: Analyzing trace with hash 572505544, now seen corresponding path program 1 times [2020-11-28 07:43:55,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:55,806 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082338611] [2020-11-28 07:43:55,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:55,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:56,018 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-28 07:43:56,019 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082338611] [2020-11-28 07:43:56,020 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252776569] [2020-11-28 07:43:56,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:56,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:56,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 13 conjunts are in the unsatisfiable core [2020-11-28 07:43:56,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:56,290 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-28 07:43:56,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:56,667 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-28 07:43:56,667 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606823813] [2020-11-28 07:43:56,670 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:43:56,670 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:56,671 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:43:56,674 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:56,674 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11] total 21 [2020-11-28 07:43:56,674 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152467041] [2020-11-28 07:43:56,675 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-28 07:43:56,675 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:56,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-28 07:43:56,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2020-11-28 07:43:56,676 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 21 states. [2020-11-28 07:43:57,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:57,040 INFO L93 Difference]: Finished difference Result 31 states and 40 transitions. [2020-11-28 07:43:57,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-28 07:43:57,041 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 24 [2020-11-28 07:43:57,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:57,043 INFO L225 Difference]: With dead ends: 31 [2020-11-28 07:43:57,043 INFO L226 Difference]: Without dead ends: 27 [2020-11-28 07:43:57,044 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2020-11-28 07:43:57,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-11-28 07:43:57,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2020-11-28 07:43:57,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-11-28 07:43:57,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2020-11-28 07:43:57,060 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 24 [2020-11-28 07:43:57,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:57,061 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2020-11-28 07:43:57,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-28 07:43:57,061 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2020-11-28 07:43:57,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-28 07:43:57,064 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:57,064 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:57,282 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:57,282 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:57,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:57,282 INFO L82 PathProgramCache]: Analyzing trace with hash -274955687, now seen corresponding path program 2 times [2020-11-28 07:43:57,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:57,283 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261264707] [2020-11-28 07:43:57,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:57,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:57,420 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-11-28 07:43:57,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261264707] [2020-11-28 07:43:57,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968386852] [2020-11-28 07:43:57,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:57,488 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-28 07:43:57,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:43:57,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2020-11-28 07:43:57,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:43:57,766 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-11-28 07:43:57,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:43:58,554 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-11-28 07:43:58,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1358779585] [2020-11-28 07:43:58,557 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:43:58,558 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:43:58,558 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:43:58,559 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:43:58,559 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 14] total 26 [2020-11-28 07:43:58,559 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975194460] [2020-11-28 07:43:58,560 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-11-28 07:43:58,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:43:58,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-11-28 07:43:58,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2020-11-28 07:43:58,561 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand 26 states. [2020-11-28 07:43:59,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:43:59,376 INFO L93 Difference]: Finished difference Result 53 states and 78 transitions. [2020-11-28 07:43:59,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-11-28 07:43:59,378 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 37 [2020-11-28 07:43:59,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:43:59,379 INFO L225 Difference]: With dead ends: 53 [2020-11-28 07:43:59,380 INFO L226 Difference]: Without dead ends: 31 [2020-11-28 07:43:59,381 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=264, Invalid=1218, Unknown=0, NotChecked=0, Total=1482 [2020-11-28 07:43:59,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-28 07:43:59,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 25. [2020-11-28 07:43:59,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-11-28 07:43:59,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2020-11-28 07:43:59,390 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 37 [2020-11-28 07:43:59,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:43:59,390 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2020-11-28 07:43:59,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-11-28 07:43:59,390 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2020-11-28 07:43:59,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-11-28 07:43:59,392 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:43:59,392 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:43:59,617 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:59,618 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:43:59,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:43:59,618 INFO L82 PathProgramCache]: Analyzing trace with hash 1338797411, now seen corresponding path program 3 times [2020-11-28 07:43:59,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:43:59,619 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660292496] [2020-11-28 07:43:59,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:43:59,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:43:59,866 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-28 07:43:59,866 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660292496] [2020-11-28 07:43:59,866 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061457391] [2020-11-28 07:43:59,866 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:43:59,925 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 07:43:59,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:43:59,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-28 07:43:59,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:00,230 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-11-28 07:44:00,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:01,046 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-28 07:44:01,046 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [776245685] [2020-11-28 07:44:01,051 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:44:01,052 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:01,053 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:44:01,053 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:01,053 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 16] total 29 [2020-11-28 07:44:01,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961898848] [2020-11-28 07:44:01,057 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-11-28 07:44:01,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:01,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-11-28 07:44:01,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=687, Unknown=0, NotChecked=0, Total=812 [2020-11-28 07:44:01,059 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand 29 states. [2020-11-28 07:44:01,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:01,844 INFO L93 Difference]: Finished difference Result 53 states and 85 transitions. [2020-11-28 07:44:01,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-11-28 07:44:01,845 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 38 [2020-11-28 07:44:01,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:01,848 INFO L225 Difference]: With dead ends: 53 [2020-11-28 07:44:01,848 INFO L226 Difference]: Without dead ends: 47 [2020-11-28 07:44:01,850 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=330, Invalid=1650, Unknown=0, NotChecked=0, Total=1980 [2020-11-28 07:44:01,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-11-28 07:44:01,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 35. [2020-11-28 07:44:01,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-11-28 07:44:01,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 57 transitions. [2020-11-28 07:44:01,888 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 57 transitions. Word has length 38 [2020-11-28 07:44:01,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:01,890 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 57 transitions. [2020-11-28 07:44:01,890 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-11-28 07:44:01,891 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 57 transitions. [2020-11-28 07:44:01,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-11-28 07:44:01,899 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:44:01,900 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:44:02,100 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:02,100 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:44:02,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:44:02,101 INFO L82 PathProgramCache]: Analyzing trace with hash 559331542, now seen corresponding path program 4 times [2020-11-28 07:44:02,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:44:02,101 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861957995] [2020-11-28 07:44:02,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:44:02,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:02,271 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 55 proven. 93 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-11-28 07:44:02,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861957995] [2020-11-28 07:44:02,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288649660] [2020-11-28 07:44:02,272 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:02,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:02,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-28 07:44:02,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:02,405 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 104 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-11-28 07:44:02,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:02,996 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 107 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-11-28 07:44:02,997 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1261005032] [2020-11-28 07:44:03,002 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:44:03,002 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:03,003 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:44:03,004 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:03,004 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 15 [2020-11-28 07:44:03,004 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030967912] [2020-11-28 07:44:03,006 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-28 07:44:03,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:03,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-28 07:44:03,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2020-11-28 07:44:03,008 INFO L87 Difference]: Start difference. First operand 35 states and 57 transitions. Second operand 15 states. [2020-11-28 07:44:03,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:03,361 INFO L93 Difference]: Finished difference Result 78 states and 142 transitions. [2020-11-28 07:44:03,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-28 07:44:03,364 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 79 [2020-11-28 07:44:03,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:03,366 INFO L225 Difference]: With dead ends: 78 [2020-11-28 07:44:03,366 INFO L226 Difference]: Without dead ends: 46 [2020-11-28 07:44:03,368 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 146 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=142, Invalid=320, Unknown=0, NotChecked=0, Total=462 [2020-11-28 07:44:03,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-11-28 07:44:03,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2020-11-28 07:44:03,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-11-28 07:44:03,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-11-28 07:44:03,391 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 79 [2020-11-28 07:44:03,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:03,391 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-11-28 07:44:03,391 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-28 07:44:03,391 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-11-28 07:44:03,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-11-28 07:44:03,398 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:44:03,398 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:44:03,599 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-28 07:44:03,599 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:44:03,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:44:03,600 INFO L82 PathProgramCache]: Analyzing trace with hash 1393152923, now seen corresponding path program 5 times [2020-11-28 07:44:03,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:44:03,600 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025919176] [2020-11-28 07:44:03,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:44:03,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:03,772 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 92 proven. 164 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-11-28 07:44:03,773 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025919176] [2020-11-28 07:44:03,773 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293693835] [2020-11-28 07:44:03,773 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:03,858 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2020-11-28 07:44:03,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:44:03,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-28 07:44:03,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:03,913 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 174 proven. 17 refuted. 0 times theorem prover too weak. 236 trivial. 0 not checked. [2020-11-28 07:44:03,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:04,507 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 174 proven. 18 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2020-11-28 07:44:04,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [3234836] [2020-11-28 07:44:04,513 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:44:04,514 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:04,514 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:44:04,515 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:04,515 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8, 9] total 17 [2020-11-28 07:44:04,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975412313] [2020-11-28 07:44:04,517 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-28 07:44:04,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:04,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-28 07:44:04,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2020-11-28 07:44:04,518 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 17 states. [2020-11-28 07:44:05,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:05,038 INFO L93 Difference]: Finished difference Result 97 states and 152 transitions. [2020-11-28 07:44:05,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-28 07:44:05,039 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 93 [2020-11-28 07:44:05,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:05,041 INFO L225 Difference]: With dead ends: 97 [2020-11-28 07:44:05,041 INFO L226 Difference]: Without dead ends: 60 [2020-11-28 07:44:05,043 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 177 SyntacticMatches, 6 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=197, Invalid=559, Unknown=0, NotChecked=0, Total=756 [2020-11-28 07:44:05,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-11-28 07:44:05,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 51. [2020-11-28 07:44:05,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-11-28 07:44:05,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 65 transitions. [2020-11-28 07:44:05,053 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 65 transitions. Word has length 93 [2020-11-28 07:44:05,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:05,054 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 65 transitions. [2020-11-28 07:44:05,054 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-28 07:44:05,054 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 65 transitions. [2020-11-28 07:44:05,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-11-28 07:44:05,056 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:44:05,057 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:44:05,281 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:05,282 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:44:05,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:44:05,282 INFO L82 PathProgramCache]: Analyzing trace with hash -2078771244, now seen corresponding path program 6 times [2020-11-28 07:44:05,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:44:05,282 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258834758] [2020-11-28 07:44:05,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:44:05,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:05,502 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 178 proven. 308 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2020-11-28 07:44:05,502 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258834758] [2020-11-28 07:44:05,503 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501225008] [2020-11-28 07:44:05,503 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:05,582 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 07:44:05,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:44:05,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-28 07:44:05,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:05,696 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 207 proven. 356 refuted. 0 times theorem prover too weak. 370 trivial. 0 not checked. [2020-11-28 07:44:05,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:07,328 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 207 proven. 383 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2020-11-28 07:44:07,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1426639412] [2020-11-28 07:44:07,330 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:44:07,331 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:07,331 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:44:07,331 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:07,332 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 19] total 23 [2020-11-28 07:44:07,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176239360] [2020-11-28 07:44:07,332 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-28 07:44:07,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:07,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-28 07:44:07,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2020-11-28 07:44:07,334 INFO L87 Difference]: Start difference. First operand 51 states and 65 transitions. Second operand 23 states. [2020-11-28 07:44:07,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:07,995 INFO L93 Difference]: Finished difference Result 121 states and 179 transitions. [2020-11-28 07:44:07,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-11-28 07:44:07,996 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 133 [2020-11-28 07:44:07,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:07,998 INFO L225 Difference]: With dead ends: 121 [2020-11-28 07:44:07,998 INFO L226 Difference]: Without dead ends: 75 [2020-11-28 07:44:08,000 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 247 SyntacticMatches, 12 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=397, Invalid=1085, Unknown=0, NotChecked=0, Total=1482 [2020-11-28 07:44:08,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-11-28 07:44:08,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 68. [2020-11-28 07:44:08,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-11-28 07:44:08,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 94 transitions. [2020-11-28 07:44:08,011 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 94 transitions. Word has length 133 [2020-11-28 07:44:08,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:08,012 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 94 transitions. [2020-11-28 07:44:08,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-28 07:44:08,012 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 94 transitions. [2020-11-28 07:44:08,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2020-11-28 07:44:08,016 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:44:08,016 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 25, 15, 15, 15, 15, 15, 15, 15, 10, 6, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:44:08,230 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:08,230 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:44:08,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:44:08,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1467296208, now seen corresponding path program 7 times [2020-11-28 07:44:08,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:44:08,230 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439511282] [2020-11-28 07:44:08,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:44:08,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:08,560 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 386 proven. 758 refuted. 0 times theorem prover too weak. 1436 trivial. 0 not checked. [2020-11-28 07:44:08,561 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439511282] [2020-11-28 07:44:08,567 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958923506] [2020-11-28 07:44:08,567 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:08,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:08,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 22 conjunts are in the unsatisfiable core [2020-11-28 07:44:08,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:08,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 843 refuted. 0 times theorem prover too weak. 1274 trivial. 0 not checked. [2020-11-28 07:44:08,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:11,551 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 891 refuted. 0 times theorem prover too weak. 1226 trivial. 0 not checked. [2020-11-28 07:44:11,551 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1722286640] [2020-11-28 07:44:11,554 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:44:11,554 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:11,554 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:44:11,556 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:11,556 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 23] total 27 [2020-11-28 07:44:11,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423568463] [2020-11-28 07:44:11,558 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-28 07:44:11,558 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:11,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-28 07:44:11,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=581, Unknown=0, NotChecked=0, Total=702 [2020-11-28 07:44:11,559 INFO L87 Difference]: Start difference. First operand 68 states and 94 transitions. Second operand 27 states. [2020-11-28 07:44:12,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:12,445 INFO L93 Difference]: Finished difference Result 153 states and 257 transitions. [2020-11-28 07:44:12,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-11-28 07:44:12,446 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 215 [2020-11-28 07:44:12,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:12,448 INFO L225 Difference]: With dead ends: 153 [2020-11-28 07:44:12,448 INFO L226 Difference]: Without dead ends: 90 [2020-11-28 07:44:12,450 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 408 SyntacticMatches, 15 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 453 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=581, Invalid=1675, Unknown=0, NotChecked=0, Total=2256 [2020-11-28 07:44:12,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-11-28 07:44:12,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 80. [2020-11-28 07:44:12,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-11-28 07:44:12,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 109 transitions. [2020-11-28 07:44:12,463 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 109 transitions. Word has length 215 [2020-11-28 07:44:12,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:12,464 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 109 transitions. [2020-11-28 07:44:12,464 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-28 07:44:12,464 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 109 transitions. [2020-11-28 07:44:12,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2020-11-28 07:44:12,467 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:44:12,467 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:44:12,679 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-11-28 07:44:12,680 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:44:12,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:44:12,680 INFO L82 PathProgramCache]: Analyzing trace with hash 2001063143, now seen corresponding path program 8 times [2020-11-28 07:44:12,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:44:12,680 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544567182] [2020-11-28 07:44:12,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:44:12,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:44:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 77 proven. 845 refuted. 0 times theorem prover too weak. 732 trivial. 0 not checked. [2020-11-28 07:44:13,276 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544567182] [2020-11-28 07:44:13,276 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583953302] [2020-11-28 07:44:13,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:13,470 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2020-11-28 07:44:13,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:44:13,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 61 conjunts are in the unsatisfiable core [2020-11-28 07:44:13,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:44:14,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 476 proven. 283 refuted. 0 times theorem prover too weak. 895 trivial. 0 not checked. [2020-11-28 07:44:14,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:44:15,156 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-11-28 07:44:16,108 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2020-11-28 07:44:16,348 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2020-11-28 07:44:16,574 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-11-28 07:44:16,806 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-11-28 07:44:17,305 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-11-28 07:44:19,154 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-11-28 07:44:20,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 381 proven. 390 refuted. 0 times theorem prover too weak. 883 trivial. 0 not checked. [2020-11-28 07:44:20,530 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [968505365] [2020-11-28 07:44:20,532 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-11-28 07:44:20,532 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:44:20,532 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:44:20,533 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:44:20,533 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 30] total 61 [2020-11-28 07:44:20,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085186061] [2020-11-28 07:44:20,534 INFO L461 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-11-28 07:44:20,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:44:20,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-11-28 07:44:20,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=3312, Unknown=0, NotChecked=0, Total=3660 [2020-11-28 07:44:20,536 INFO L87 Difference]: Start difference. First operand 80 states and 109 transitions. Second operand 61 states. [2020-11-28 07:44:21,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:44:21,435 INFO L93 Difference]: Finished difference Result 88 states and 122 transitions. [2020-11-28 07:44:21,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-11-28 07:44:21,435 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 174 [2020-11-28 07:44:21,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:44:21,436 INFO L225 Difference]: With dead ends: 88 [2020-11-28 07:44:21,436 INFO L226 Difference]: Without dead ends: 0 [2020-11-28 07:44:21,439 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 342 SyntacticMatches, 4 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2133 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=712, Invalid=5608, Unknown=0, NotChecked=0, Total=6320 [2020-11-28 07:44:21,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-28 07:44:21,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-28 07:44:21,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-28 07:44:21,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-28 07:44:21,440 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 174 [2020-11-28 07:44:21,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:44:21,440 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 07:44:21,440 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-11-28 07:44:21,440 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-28 07:44:21,440 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-28 07:44:21,650 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:44:21,651 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-28 07:44:22,317 WARN L193 SmtUtils]: Spent 486.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 33 [2020-11-28 07:44:22,378 INFO L274 CegarLoopResult]: For program point fibonacciFINAL(lines 16 24) no Hoare annotation was computed. [2020-11-28 07:44:22,378 INFO L277 CegarLoopResult]: At program point fibonacciENTRY(lines 16 24) the Hoare annotation is: true [2020-11-28 07:44:22,378 INFO L270 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (<= |fibonacci_#in~n| fibonacci_~n) (<= 2 |fibonacci_#in~n|) (<= fibonacci_~n |fibonacci_#in~n|)) [2020-11-28 07:44:22,378 INFO L274 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L270 CegarLoopResult]: At program point L22-2(line 22) the Hoare annotation is: (let ((.cse0 (= |fibonacci_#t~ret7| 1)) (.cse1 (<= fibonacci_~n |fibonacci_#in~n|))) (and (or (not (<= |fibonacci_#in~n| 2)) (and .cse0 (< 1 fibonacci_~n) .cse1)) (let ((.cse4 (<= |fibonacci_#in~n| (+ |fibonacci_#t~ret7| 2))) (.cse2 (<= 5 |fibonacci_#in~n|)) (.cse3 (<= |fibonacci_#in~n| fibonacci_~n))) (or (and (<= fibonacci_~n 5) .cse2 .cse3 .cse4) (not (<= 3 |fibonacci_#in~n|)) (and (<= 4 fibonacci_~n) (<= |fibonacci_#in~n| 4) .cse1 .cse4) (and (<= 3 fibonacci_~n) .cse0 .cse1 .cse4) (and .cse2 (<= |fibonacci_#in~n| (+ |fibonacci_#t~ret7| 1)) .cse3 .cse1))))) [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point L19(lines 19 23) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point fibonacciEXIT(lines 16 24) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point L17(lines 17 23) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point L33(lines 33 37) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L277 CegarLoopResult]: At program point L32(line 32) the Hoare annotation is: true [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point L32-1(line 32) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-28 07:44:22,379 INFO L274 CegarLoopResult]: For program point L29(lines 29 31) no Hoare annotation was computed. [2020-11-28 07:44:22,380 INFO L277 CegarLoopResult]: At program point L27(lines 27 38) the Hoare annotation is: true [2020-11-28 07:44:22,380 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 3) no Hoare annotation was computed. [2020-11-28 07:44:22,380 INFO L274 CegarLoopResult]: For program point L36(line 36) no Hoare annotation was computed. [2020-11-28 07:44:22,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:44:22 BoogieIcfgContainer [2020-11-28 07:44:22,386 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:44:22,386 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:44:22,386 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:44:22,386 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:44:22,387 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:43:53" (3/4) ... [2020-11-28 07:44:22,389 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-28 07:44:22,392 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibonacci [2020-11-28 07:44:22,395 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2020-11-28 07:44:22,396 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-11-28 07:44:22,396 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 07:44:22,396 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 07:44:22,425 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_befc08af-2d56-4c9d-8478-56a09c5fe23f/bin/utaipan/witness.graphml [2020-11-28 07:44:22,425 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:44:22,426 INFO L168 Benchmark]: Toolchain (without parser) took 29777.50 ms. Allocated memory was 92.3 MB in the beginning and 408.9 MB in the end (delta: 316.7 MB). Free memory was 52.2 MB in the beginning and 349.9 MB in the end (delta: -297.7 MB). Peak memory consumption was 18.7 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:22,426 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 92.3 MB. Free memory is still 68.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:44:22,427 INFO L168 Benchmark]: CACSL2BoogieTranslator took 254.99 ms. Allocated memory is still 92.3 MB. Free memory was 52.0 MB in the beginning and 63.4 MB in the end (delta: -11.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:22,427 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.79 ms. Allocated memory is still 92.3 MB. Free memory was 63.4 MB in the beginning and 62.1 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:44:22,428 INFO L168 Benchmark]: Boogie Preprocessor took 32.69 ms. Allocated memory is still 92.3 MB. Free memory was 62.1 MB in the beginning and 61.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:22,428 INFO L168 Benchmark]: RCFGBuilder took 395.15 ms. Allocated memory is still 92.3 MB. Free memory was 61.1 MB in the beginning and 47.8 MB in the end (delta: 13.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:22,429 INFO L168 Benchmark]: TraceAbstraction took 29008.80 ms. Allocated memory was 92.3 MB in the beginning and 408.9 MB in the end (delta: 316.7 MB). Free memory was 47.3 MB in the beginning and 353.0 MB in the end (delta: -305.7 MB). Peak memory consumption was 226.6 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:22,429 INFO L168 Benchmark]: Witness Printer took 38.77 ms. Allocated memory is still 408.9 MB. Free memory was 353.0 MB in the beginning and 349.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-28 07:44:22,431 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 92.3 MB. Free memory is still 68.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 254.99 ms. Allocated memory is still 92.3 MB. Free memory was 52.0 MB in the beginning and 63.4 MB in the end (delta: -11.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 36.79 ms. Allocated memory is still 92.3 MB. Free memory was 63.4 MB in the beginning and 62.1 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 32.69 ms. Allocated memory is still 92.3 MB. Free memory was 62.1 MB in the beginning and 61.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 395.15 ms. Allocated memory is still 92.3 MB. Free memory was 61.1 MB in the beginning and 47.8 MB in the end (delta: 13.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 29008.80 ms. Allocated memory was 92.3 MB in the beginning and 408.9 MB in the end (delta: 316.7 MB). Free memory was 47.3 MB in the beginning and 353.0 MB in the end (delta: -305.7 MB). Peak memory consumption was 226.6 MB. Max. memory is 16.1 GB. * Witness Printer took 38.77 ms. Allocated memory is still 408.9 MB. Free memory was 353.0 MB in the beginning and 349.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 3]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 28.2s, OverallIterations: 11, TraceHistogramMax: 31, AutomataDifference: 5.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.7s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 179 SDtfs, 729 SDslu, 1004 SDs, 0 SdLazy, 2741 SolverSat, 920 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1906 GetRequests, 1509 SyntacticMatches, 53 SemanticMatches, 344 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3934 ImplicationChecksByTransitivity, 7.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=80occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 11 MinimizatonAttempts, 54 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 140 PreInvPairs, 185 NumberOfFragments, 94 HoareAnnotationTreeSize, 140 FomulaSimplifications, 574 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 5 FomulaSimplificationsInter, 1160 FormulaSimplificationTreeSizeReductionInter, 0.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 18.4s InterpolantComputationTime, 1653 NumberOfCodeBlocks, 1590 NumberOfCodeBlocksAsserted, 45 NumberOfCheckSat, 2440 ConstructedInterpolants, 0 QuantifiedInterpolants, 736667 SizeOfPredicates, 61 NumberOfNonLiveVariables, 1905 ConjunctsInSsa, 181 ConjunctsInUnsatCore, 29 InterpolantComputations, 2 PerfectInterpolantSequences, 12299/18036 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...