./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci01-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci01-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6b0570f2e0d80d68bc280040cce27f654b3fe7a2c0bad30f9bb811af9ca3d994 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:08:42,582 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:08:42,600 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:08:42,672 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:08:42,673 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:08:42,679 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:08:42,682 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:08:42,687 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:08:42,691 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:08:42,698 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:08:42,699 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:08:42,702 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:08:42,702 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:08:42,706 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:08:42,709 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:08:42,715 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:08:42,717 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:08:42,718 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:08:42,721 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:08:42,731 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:08:42,734 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:08:42,736 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:08:42,740 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:08:42,742 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:08:42,753 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:08:42,754 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:08:42,754 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:08:42,757 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:08:42,758 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:08:42,760 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:08:42,761 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:08:42,762 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:08:42,764 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:08:42,766 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:08:42,768 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:08:42,768 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:08:42,769 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:08:42,770 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:08:42,770 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:08:42,771 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:08:42,772 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:08:42,774 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/config/svcomp-Overflow-32bit-Taipan_Default.epf [2021-11-03 04:08:42,830 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:08:42,831 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:08:42,833 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:08:42,833 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:08:42,834 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:08:42,834 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:08:42,834 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:08:42,835 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:08:42,835 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:08:42,835 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:08:42,837 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:08:42,837 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:08:42,837 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:08:42,838 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:08:42,838 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:08:42,840 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:08:42,840 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 04:08:42,840 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-03 04:08:42,841 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:08:42,841 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 04:08:42,841 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:08:42,841 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:08:42,842 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:08:42,842 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:08:42,842 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-03 04:08:42,843 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 04:08:42,843 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:08:42,843 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:08:42,844 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:08:42,846 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:08:42,846 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:08:42,846 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:08:42,847 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:08:42,847 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:08:42,848 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:08:42,848 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:08:42,848 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:08:42,848 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:08:42,849 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:08:42,849 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:08:42,849 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_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6b0570f2e0d80d68bc280040cce27f654b3fe7a2c0bad30f9bb811af9ca3d994 [2021-11-03 04:08:43,256 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:08:43,282 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:08:43,285 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:08:43,287 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:08:43,288 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:08:43,289 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/recursive/Fibonacci01-1.c [2021-11-03 04:08:43,380 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/data/14744c9e9/c0135a0f41d44db7b9575a4862465c95/FLAGcc4deec0c [2021-11-03 04:08:43,896 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:08:43,897 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/sv-benchmarks/c/recursive/Fibonacci01-1.c [2021-11-03 04:08:43,906 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/data/14744c9e9/c0135a0f41d44db7b9575a4862465c95/FLAGcc4deec0c [2021-11-03 04:08:44,273 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/data/14744c9e9/c0135a0f41d44db7b9575a4862465c95 [2021-11-03 04:08:44,276 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:08:44,278 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:08:44,282 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:08:44,282 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:08:44,286 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:08:44,286 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,288 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d2b5400 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44, skipping insertion in model container [2021-11-03 04:08:44,288 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,305 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:08:44,327 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:08:44,545 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/sv-benchmarks/c/recursive/Fibonacci01-1.c[804,817] [2021-11-03 04:08:44,546 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:08:44,558 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:08:44,578 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/sv-benchmarks/c/recursive/Fibonacci01-1.c[804,817] [2021-11-03 04:08:44,579 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:08:44,596 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:08:44,597 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44 WrapperNode [2021-11-03 04:08:44,597 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:08:44,599 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:08:44,599 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:08:44,599 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:08:44,610 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,618 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,640 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:08:44,641 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:08:44,642 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:08:44,642 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:08:44,652 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,653 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,655 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,655 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,660 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,662 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,666 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:08:44,668 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:08:44,668 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:08:44,668 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:08:44,669 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (1/1) ... [2021-11-03 04:08:44,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:08:44,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:44,716 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:08:44,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:08:44,774 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-03 04:08:44,775 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-03 04:08:44,775 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:08:44,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:08:44,775 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:08:44,776 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:08:45,147 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:08:45,147 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-03 04:08:45,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:08:45 BoogieIcfgContainer [2021-11-03 04:08:45,154 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:08:45,174 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:08:45,174 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:08:45,178 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:08:45,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:08:44" (1/3) ... [2021-11-03 04:08:45,180 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c42d8a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:08:45, skipping insertion in model container [2021-11-03 04:08:45,180 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:08:44" (2/3) ... [2021-11-03 04:08:45,180 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c42d8a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:08:45, skipping insertion in model container [2021-11-03 04:08:45,181 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:08:45" (3/3) ... [2021-11-03 04:08:45,182 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2021-11-03 04:08:45,200 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:08:45,200 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2021-11-03 04:08:45,271 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:08:45,286 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-03 04:08:45,287 INFO L340 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2021-11-03 04:08:45,318 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-03 04:08:45,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-03 04:08:45,325 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:45,326 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:08:45,327 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:45,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:45,345 INFO L85 PathProgramCache]: Analyzing trace with hash 898045137, now seen corresponding path program 1 times [2021-11-03 04:08:45,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:45,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981744082] [2021-11-03 04:08:45,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:45,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:45,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:45,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:08:45,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:45,723 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981744082] [2021-11-03 04:08:45,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981744082] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:08:45,724 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:08:45,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:08:45,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479914937] [2021-11-03 04:08:45,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:08:45,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:45,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:08:45,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:08:45,775 INFO L87 Difference]: Start difference. First operand has 31 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:08:45,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:45,961 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2021-11-03 04:08:45,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:08:45,965 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-03 04:08:45,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:45,975 INFO L225 Difference]: With dead ends: 33 [2021-11-03 04:08:45,976 INFO L226 Difference]: Without dead ends: 26 [2021-11-03 04:08:45,980 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:08:46,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-03 04:08:46,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-03 04:08:46,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 21 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-03 04:08:46,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-11-03 04:08:46,040 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 7 [2021-11-03 04:08:46,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:46,041 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-11-03 04:08:46,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:08:46,042 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-11-03 04:08:46,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-03 04:08:46,044 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:46,045 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:08:46,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:08:46,046 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:46,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:46,051 INFO L85 PathProgramCache]: Analyzing trace with hash 2069595513, now seen corresponding path program 1 times [2021-11-03 04:08:46,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:46,053 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136793121] [2021-11-03 04:08:46,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:46,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:46,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:46,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:08:46,129 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:46,129 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136793121] [2021-11-03 04:08:46,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136793121] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:08:46,130 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:08:46,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-03 04:08:46,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159065745] [2021-11-03 04:08:46,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:08:46,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:46,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:08:46,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:08:46,140 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:08:46,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:46,164 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2021-11-03 04:08:46,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:08:46,165 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-03 04:08:46,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:46,168 INFO L225 Difference]: With dead ends: 28 [2021-11-03 04:08:46,168 INFO L226 Difference]: Without dead ends: 26 [2021-11-03 04:08:46,169 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:08:46,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-03 04:08:46,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2021-11-03 04:08:46,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-03 04:08:46,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-11-03 04:08:46,180 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 8 [2021-11-03 04:08:46,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:46,181 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-11-03 04:08:46,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:08:46,181 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-11-03 04:08:46,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-03 04:08:46,182 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:46,183 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:08:46,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 04:08:46,184 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:46,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:46,185 INFO L85 PathProgramCache]: Analyzing trace with hash 299865495, now seen corresponding path program 1 times [2021-11-03 04:08:46,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:46,185 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941792332] [2021-11-03 04:08:46,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:46,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:46,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:46,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:08:46,242 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:46,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941792332] [2021-11-03 04:08:46,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941792332] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:08:46,243 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:08:46,243 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:08:46,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548422888] [2021-11-03 04:08:46,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:08:46,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:46,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:08:46,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:08:46,246 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-03 04:08:46,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:46,276 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-11-03 04:08:46,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:08:46,277 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-03 04:08:46,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:46,278 INFO L225 Difference]: With dead ends: 24 [2021-11-03 04:08:46,279 INFO L226 Difference]: Without dead ends: 20 [2021-11-03 04:08:46,279 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:08:46,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-03 04:08:46,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-03 04:08:46,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-03 04:08:46,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-03 04:08:46,286 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 10 [2021-11-03 04:08:46,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:46,287 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-03 04:08:46,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-03 04:08:46,288 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-03 04:08:46,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-03 04:08:46,289 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:46,290 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:08:46,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 04:08:46,290 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:46,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:46,301 INFO L85 PathProgramCache]: Analyzing trace with hash -1166742503, now seen corresponding path program 1 times [2021-11-03 04:08:46,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:46,314 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064444675] [2021-11-03 04:08:46,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:46,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:46,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:46,460 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-03 04:08:46,461 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:46,461 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064444675] [2021-11-03 04:08:46,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064444675] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:08:46,462 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:08:46,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:08:46,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16826133] [2021-11-03 04:08:46,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:08:46,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:46,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:08:46,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:08:46,466 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-03 04:08:46,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:46,512 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-11-03 04:08:46,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:08:46,513 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-03 04:08:46,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:46,515 INFO L225 Difference]: With dead ends: 36 [2021-11-03 04:08:46,515 INFO L226 Difference]: Without dead ends: 34 [2021-11-03 04:08:46,516 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:08:46,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-03 04:08:46,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2021-11-03 04:08:46,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-03 04:08:46,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-03 04:08:46,527 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 23 [2021-11-03 04:08:46,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:46,527 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-03 04:08:46,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-03 04:08:46,528 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-03 04:08:46,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-03 04:08:46,530 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:46,530 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:08:46,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 04:08:46,531 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:46,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:46,532 INFO L85 PathProgramCache]: Analyzing trace with hash 455941723, now seen corresponding path program 1 times [2021-11-03 04:08:46,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:46,533 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221654789] [2021-11-03 04:08:46,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:46,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:46,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:46,642 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-03 04:08:46,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:46,643 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221654789] [2021-11-03 04:08:46,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221654789] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:08:46,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312346775] [2021-11-03 04:08:46,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:46,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:46,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:46,647 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:08:46,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:08:46,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:46,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-03 04:08:46,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:08:46,971 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-03 04:08:46,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:08:47,206 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-03 04:08:47,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312346775] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:08:47,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [44664848] [2021-11-03 04:08:47,233 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-03 04:08:47,233 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:08:47,239 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:08:47,241 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:08:47,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2021-11-03 04:08:47,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138782243] [2021-11-03 04:08:47,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-03 04:08:47,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:47,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-03 04:08:47,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-03 04:08:47,245 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-03 04:08:47,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:47,631 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2021-11-03 04:08:47,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 04:08:47,632 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 30 [2021-11-03 04:08:47,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:47,638 INFO L225 Difference]: With dead ends: 90 [2021-11-03 04:08:47,638 INFO L226 Difference]: Without dead ends: 64 [2021-11-03 04:08:47,645 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-11-03 04:08:47,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-03 04:08:47,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2021-11-03 04:08:47,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.105263157894737) internal successors, (42), 41 states have internal predecessors, (42), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-03 04:08:47,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2021-11-03 04:08:47,664 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 30 [2021-11-03 04:08:47,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:47,664 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2021-11-03 04:08:47,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-03 04:08:47,665 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2021-11-03 04:08:47,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-03 04:08:47,667 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:47,668 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:08:47,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-03 04:08:47,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:47,886 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:47,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:47,887 INFO L85 PathProgramCache]: Analyzing trace with hash 1228045225, now seen corresponding path program 2 times [2021-11-03 04:08:47,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:47,887 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577137292] [2021-11-03 04:08:47,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:47,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:47,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:48,037 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-03 04:08:48,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:48,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577137292] [2021-11-03 04:08:48,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577137292] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:08:48,039 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119930996] [2021-11-03 04:08:48,039 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:08:48,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:48,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:48,056 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:08:48,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-03 04:08:48,136 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-03 04:08:48,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:08:48,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 04:08:48,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:08:48,296 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-03 04:08:48,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:08:48,410 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-03 04:08:48,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119930996] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-03 04:08:48,411 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-03 04:08:48,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 9 [2021-11-03 04:08:48,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751361572] [2021-11-03 04:08:48,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 04:08:48,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:48,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 04:08:48,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-03 04:08:48,417 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-03 04:08:48,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:48,490 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2021-11-03 04:08:48,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-03 04:08:48,491 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-11-03 04:08:48,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:48,494 INFO L225 Difference]: With dead ends: 60 [2021-11-03 04:08:48,496 INFO L226 Difference]: Without dead ends: 59 [2021-11-03 04:08:48,497 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-03 04:08:48,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-03 04:08:48,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-11-03 04:08:48,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 9 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-03 04:08:48,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-11-03 04:08:48,531 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 24 [2021-11-03 04:08:48,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:48,533 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-11-03 04:08:48,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-03 04:08:48,533 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-11-03 04:08:48,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-03 04:08:48,538 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:48,538 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:08:48,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-03 04:08:48,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:48,761 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:48,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:48,761 INFO L85 PathProgramCache]: Analyzing trace with hash 569765849, now seen corresponding path program 1 times [2021-11-03 04:08:48,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:48,762 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709884942] [2021-11-03 04:08:48,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:48,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:48,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:48,851 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-03 04:08:48,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:48,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709884942] [2021-11-03 04:08:48,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709884942] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:08:48,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579400970] [2021-11-03 04:08:48,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:48,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:48,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:48,854 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:08:48,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-03 04:08:48,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:48,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-03 04:08:48,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:08:49,126 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-03 04:08:49,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:08:49,269 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-03 04:08:49,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579400970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:08:49,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [380640326] [2021-11-03 04:08:49,274 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:08:49,274 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:08:49,275 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:08:49,275 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:08:49,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2021-11-03 04:08:49,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298630169] [2021-11-03 04:08:49,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-03 04:08:49,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:49,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-03 04:08:49,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-03 04:08:49,278 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-03 04:08:49,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:49,385 INFO L93 Difference]: Finished difference Result 69 states and 93 transitions. [2021-11-03 04:08:49,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-03 04:08:49,386 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 31 [2021-11-03 04:08:49,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:49,388 INFO L225 Difference]: With dead ends: 69 [2021-11-03 04:08:49,388 INFO L226 Difference]: Without dead ends: 68 [2021-11-03 04:08:49,389 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-03 04:08:49,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-03 04:08:49,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-11-03 04:08:49,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 50 states have (on average 1.1) internal successors, (55), 51 states have internal predecessors, (55), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 12 states have call predecessors, (27), 7 states have call successors, (27) [2021-11-03 04:08:49,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2021-11-03 04:08:49,406 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 31 [2021-11-03 04:08:49,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:49,407 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2021-11-03 04:08:49,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-03 04:08:49,407 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2021-11-03 04:08:49,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-03 04:08:49,410 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:49,410 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:08:49,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-03 04:08:49,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:49,625 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:49,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:49,625 INFO L85 PathProgramCache]: Analyzing trace with hash 341035740, now seen corresponding path program 1 times [2021-11-03 04:08:49,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:49,626 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564448857] [2021-11-03 04:08:49,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:49,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:49,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:49,817 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-03 04:08:49,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:49,825 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564448857] [2021-11-03 04:08:49,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564448857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:08:49,827 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807671261] [2021-11-03 04:08:49,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:49,828 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:49,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:49,833 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:08:49,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-03 04:08:49,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:49,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-03 04:08:49,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:08:50,242 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-03 04:08:50,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:08:50,576 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-03 04:08:50,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807671261] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:08:50,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1187462945] [2021-11-03 04:08:50,584 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:08:50,584 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:08:50,585 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:08:50,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:08:50,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2021-11-03 04:08:50,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471242171] [2021-11-03 04:08:50,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-03 04:08:50,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:50,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-03 04:08:50,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-03 04:08:50,588 INFO L87 Difference]: Start difference. First operand 66 states and 90 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-03 04:08:50,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:50,918 INFO L93 Difference]: Finished difference Result 134 states and 199 transitions. [2021-11-03 04:08:50,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-03 04:08:50,922 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) Word has length 50 [2021-11-03 04:08:50,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:50,926 INFO L225 Difference]: With dead ends: 134 [2021-11-03 04:08:50,926 INFO L226 Difference]: Without dead ends: 133 [2021-11-03 04:08:50,927 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-03 04:08:50,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-03 04:08:50,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 98. [2021-11-03 04:08:50,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-03 04:08:50,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-03 04:08:50,956 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 50 [2021-11-03 04:08:50,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:50,957 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-03 04:08:50,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-03 04:08:50,958 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-03 04:08:50,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-03 04:08:50,962 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:50,962 INFO L513 BasicCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2021-11-03 04:08:50,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-03 04:08:51,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-03 04:08:51,176 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:51,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:51,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1720588685, now seen corresponding path program 1 times [2021-11-03 04:08:51,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:51,177 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870574123] [2021-11-03 04:08:51,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:51,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:51,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:51,288 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-11-03 04:08:51,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:51,289 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870574123] [2021-11-03 04:08:51,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870574123] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:08:51,290 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:08:51,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:08:51,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268021031] [2021-11-03 04:08:51,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:08:51,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:51,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:08:51,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:08:51,293 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-03 04:08:51,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:51,341 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-03 04:08:51,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:08:51,342 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 69 [2021-11-03 04:08:51,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:51,345 INFO L225 Difference]: With dead ends: 111 [2021-11-03 04:08:51,345 INFO L226 Difference]: Without dead ends: 110 [2021-11-03 04:08:51,346 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:08:51,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-03 04:08:51,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-03 04:08:51,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-03 04:08:51,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-03 04:08:51,369 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 69 [2021-11-03 04:08:51,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:51,370 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-03 04:08:51,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-03 04:08:51,370 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-03 04:08:51,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-03 04:08:51,375 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:51,375 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-03 04:08:51,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-03 04:08:51,376 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:51,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:51,376 INFO L85 PathProgramCache]: Analyzing trace with hash 831290973, now seen corresponding path program 2 times [2021-11-03 04:08:51,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:51,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473100806] [2021-11-03 04:08:51,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:51,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:51,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:51,455 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-03 04:08:51,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:51,462 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473100806] [2021-11-03 04:08:51,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473100806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:08:51,462 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:08:51,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:08:51,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270647654] [2021-11-03 04:08:51,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:08:51,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:51,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:08:51,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:08:51,465 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-03 04:08:51,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:51,504 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2021-11-03 04:08:51,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:08:51,505 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 64 [2021-11-03 04:08:51,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:51,508 INFO L225 Difference]: With dead ends: 111 [2021-11-03 04:08:51,508 INFO L226 Difference]: Without dead ends: 110 [2021-11-03 04:08:51,509 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:08:51,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-03 04:08:51,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2021-11-03 04:08:51,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2021-11-03 04:08:51,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2021-11-03 04:08:51,530 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 64 [2021-11-03 04:08:51,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:51,531 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2021-11-03 04:08:51,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-03 04:08:51,532 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2021-11-03 04:08:51,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-03 04:08:51,539 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:51,539 INFO L513 BasicCegarLoop]: trace histogram [14, 12, 11, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2021-11-03 04:08:51,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-03 04:08:51,540 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:51,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:51,541 INFO L85 PathProgramCache]: Analyzing trace with hash -1227543676, now seen corresponding path program 2 times [2021-11-03 04:08:51,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:51,541 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261987795] [2021-11-03 04:08:51,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:51,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:51,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:51,754 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 68 proven. 165 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2021-11-03 04:08:51,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:51,754 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261987795] [2021-11-03 04:08:51,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261987795] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:08:51,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227679132] [2021-11-03 04:08:51,755 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:08:51,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:51,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:51,760 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:08:51,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-03 04:08:51,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-03 04:08:51,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:08:51,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-03 04:08:51,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:08:52,385 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 198 proven. 85 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-03 04:08:52,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:08:53,289 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 198 proven. 88 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-11-03 04:08:53,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227679132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:08:53,290 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [564103410] [2021-11-03 04:08:53,297 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:08:53,298 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:08:53,298 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:08:53,299 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:08:53,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 19 [2021-11-03 04:08:53,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221503360] [2021-11-03 04:08:53,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-03 04:08:53,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:53,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-03 04:08:53,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-11-03 04:08:53,309 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) [2021-11-03 04:08:53,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:53,801 INFO L93 Difference]: Finished difference Result 175 states and 303 transitions. [2021-11-03 04:08:53,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-03 04:08:53,802 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) Word has length 128 [2021-11-03 04:08:53,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:53,804 INFO L225 Difference]: With dead ends: 175 [2021-11-03 04:08:53,804 INFO L226 Difference]: Without dead ends: 80 [2021-11-03 04:08:53,806 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=254, Invalid=676, Unknown=0, NotChecked=0, Total=930 [2021-11-03 04:08:53,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-03 04:08:53,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2021-11-03 04:08:53,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 55 states have internal predecessors, (62), 8 states have call successors, (8), 5 states have call predecessors, (8), 6 states have return successors, (17), 11 states have call predecessors, (17), 7 states have call successors, (17) [2021-11-03 04:08:53,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2021-11-03 04:08:53,817 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 128 [2021-11-03 04:08:53,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:53,818 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2021-11-03 04:08:53,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) [2021-11-03 04:08:53,818 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2021-11-03 04:08:53,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-03 04:08:53,820 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:53,820 INFO L513 BasicCegarLoop]: trace histogram [10, 9, 8, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-03 04:08:53,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-03 04:08:54,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-03 04:08:54,035 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:54,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:54,036 INFO L85 PathProgramCache]: Analyzing trace with hash -573340710, now seen corresponding path program 3 times [2021-11-03 04:08:54,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:54,037 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378349836] [2021-11-03 04:08:54,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:54,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:54,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:54,194 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 93 proven. 48 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-03 04:08:54,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:54,195 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378349836] [2021-11-03 04:08:54,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [378349836] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:08:54,195 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063826689] [2021-11-03 04:08:54,196 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:08:54,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:54,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:54,197 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:08:54,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-03 04:08:54,476 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:08:54,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:08:54,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-03 04:08:54,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:08:54,805 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 140 proven. 37 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-03 04:08:54,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:08:55,612 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 102 proven. 62 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-11-03 04:08:55,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063826689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:08:55,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1758310263] [2021-11-03 04:08:55,622 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:08:55,622 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:08:55,623 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:08:55,623 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:08:55,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2021-11-03 04:08:55,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254756512] [2021-11-03 04:08:55,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-03 04:08:55,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:55,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-03 04:08:55,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-03 04:08:55,629 INFO L87 Difference]: Start difference. First operand 72 states and 87 transitions. Second operand has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-03 04:08:55,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:55,889 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2021-11-03 04:08:55,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 04:08:55,890 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) Word has length 90 [2021-11-03 04:08:55,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:55,891 INFO L225 Difference]: With dead ends: 131 [2021-11-03 04:08:55,891 INFO L226 Difference]: Without dead ends: 64 [2021-11-03 04:08:55,892 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 174 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2021-11-03 04:08:55,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-03 04:08:55,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-03 04:08:55,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.08) internal successors, (54), 49 states have internal predecessors, (54), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-03 04:08:55,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-03 04:08:55,915 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 90 [2021-11-03 04:08:55,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:55,916 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-03 04:08:55,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2021-11-03 04:08:55,916 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-03 04:08:55,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-03 04:08:55,920 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:55,920 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2021-11-03 04:08:55,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-03 04:08:56,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-03 04:08:56,147 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:56,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:56,148 INFO L85 PathProgramCache]: Analyzing trace with hash -475477922, now seen corresponding path program 3 times [2021-11-03 04:08:56,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:56,148 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965210099] [2021-11-03 04:08:56,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:56,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:56,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:56,339 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-03 04:08:56,339 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:56,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965210099] [2021-11-03 04:08:56,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965210099] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:08:56,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [5024157] [2021-11-03 04:08:56,340 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:08:56,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:56,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:56,342 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:08:56,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-03 04:08:56,688 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:08:56,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:08:56,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-03 04:08:56,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:08:57,071 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-03 04:08:57,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:08:57,518 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-03 04:08:57,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [5024157] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:08:57,518 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1513685400] [2021-11-03 04:08:57,521 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:08:57,521 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:08:57,521 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:08:57,522 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:08:57,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 18 [2021-11-03 04:08:57,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27895554] [2021-11-03 04:08:57,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-03 04:08:57,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:08:57,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-03 04:08:57,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-03 04:08:57,530 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-03 04:08:57,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:08:57,691 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2021-11-03 04:08:57,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-03 04:08:57,692 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) Word has length 84 [2021-11-03 04:08:57,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:08:57,693 INFO L225 Difference]: With dead ends: 68 [2021-11-03 04:08:57,693 INFO L226 Difference]: Without dead ends: 67 [2021-11-03 04:08:57,694 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2021-11-03 04:08:57,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-03 04:08:57,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2021-11-03 04:08:57,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 50 states have (on average 1.06) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-03 04:08:57,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-11-03 04:08:57,709 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 84 [2021-11-03 04:08:57,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:08:57,711 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-11-03 04:08:57,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-03 04:08:57,711 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-11-03 04:08:57,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-03 04:08:57,715 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:08:57,715 INFO L513 BasicCegarLoop]: trace histogram [19, 18, 15, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 6, 4, 1, 1, 1, 1] [2021-11-03 04:08:57,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-03 04:08:57,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-03 04:08:57,937 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:08:57,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:08:57,937 INFO L85 PathProgramCache]: Analyzing trace with hash -759625417, now seen corresponding path program 4 times [2021-11-03 04:08:57,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:08:57,938 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723305864] [2021-11-03 04:08:57,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:08:57,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:08:58,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:58,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 205 proven. 423 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2021-11-03 04:08:58,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:08:58,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723305864] [2021-11-03 04:08:58,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1723305864] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:08:58,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812250697] [2021-11-03 04:08:58,226 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:08:58,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:08:58,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:08:58,228 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:08:58,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-03 04:08:58,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:08:58,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 04:08:58,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:08:59,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 227 proven. 486 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-11-03 04:08:59,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:09:01,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 227 proven. 525 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2021-11-03 04:09:01,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812250697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:09:01,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1533292307] [2021-11-03 04:09:01,301 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:09:01,302 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:09:01,302 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:09:01,304 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:09:01,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 19] total 24 [2021-11-03 04:09:01,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581772877] [2021-11-03 04:09:01,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-03 04:09:01,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:09:01,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-03 04:09:01,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-03 04:09:01,310 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 24 states, 24 states have (on average 5.166666666666667) internal successors, (124), 24 states have internal predecessors, (124), 17 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) [2021-11-03 04:09:01,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:09:01,911 INFO L93 Difference]: Finished difference Result 152 states and 184 transitions. [2021-11-03 04:09:01,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-03 04:09:01,913 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.166666666666667) internal successors, (124), 24 states have internal predecessors, (124), 17 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) Word has length 181 [2021-11-03 04:09:01,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:09:01,916 INFO L225 Difference]: With dead ends: 152 [2021-11-03 04:09:01,916 INFO L226 Difference]: Without dead ends: 94 [2021-11-03 04:09:01,918 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=416, Invalid=1144, Unknown=0, NotChecked=0, Total=1560 [2021-11-03 04:09:01,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-03 04:09:01,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 81. [2021-11-03 04:09:01,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 62 states have internal predecessors, (70), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (17), 10 states have call predecessors, (17), 8 states have call successors, (17) [2021-11-03 04:09:01,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 96 transitions. [2021-11-03 04:09:01,944 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 96 transitions. Word has length 181 [2021-11-03 04:09:01,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:09:01,945 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 96 transitions. [2021-11-03 04:09:01,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.166666666666667) internal successors, (124), 24 states have internal predecessors, (124), 17 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (26), 11 states have call predecessors, (26), 17 states have call successors, (26) [2021-11-03 04:09:01,945 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 96 transitions. [2021-11-03 04:09:01,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-03 04:09:01,947 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:09:01,948 INFO L513 BasicCegarLoop]: trace histogram [14, 12, 11, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2021-11-03 04:09:01,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-03 04:09:02,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-03 04:09:02,162 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:09:02,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:09:02,163 INFO L85 PathProgramCache]: Analyzing trace with hash -307591164, now seen corresponding path program 5 times [2021-11-03 04:09:02,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:09:02,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54824024] [2021-11-03 04:09:02,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:09:02,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:09:02,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:09:02,367 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 164 proven. 168 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-03 04:09:02,367 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:09:02,368 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54824024] [2021-11-03 04:09:02,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54824024] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:09:02,368 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243463778] [2021-11-03 04:09:02,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:09:02,369 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:09:02,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:09:02,373 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:09:02,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-03 04:09:03,091 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-03 04:09:03,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:09:03,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-03 04:09:03,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:09:03,736 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 61 proven. 90 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2021-11-03 04:09:03,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:09:05,198 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 103 proven. 90 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2021-11-03 04:09:05,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243463778] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:09:05,199 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [844569518] [2021-11-03 04:09:05,201 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:09:05,201 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:09:05,202 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:09:05,203 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:09:05,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 15] total 35 [2021-11-03 04:09:05,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960298663] [2021-11-03 04:09:05,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-03 04:09:05,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:09:05,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-03 04:09:05,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1023, Unknown=0, NotChecked=0, Total=1190 [2021-11-03 04:09:05,207 INFO L87 Difference]: Start difference. First operand 81 states and 96 transitions. Second operand has 35 states, 35 states have (on average 3.4) internal successors, (119), 35 states have internal predecessors, (119), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) [2021-11-03 04:09:06,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:09:06,572 INFO L93 Difference]: Finished difference Result 189 states and 252 transitions. [2021-11-03 04:09:06,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-03 04:09:06,573 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.4) internal successors, (119), 35 states have internal predecessors, (119), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) Word has length 128 [2021-11-03 04:09:06,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:09:06,575 INFO L225 Difference]: With dead ends: 189 [2021-11-03 04:09:06,576 INFO L226 Difference]: Without dead ends: 113 [2021-11-03 04:09:06,578 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 955 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=662, Invalid=3120, Unknown=0, NotChecked=0, Total=3782 [2021-11-03 04:09:06,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-03 04:09:06,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 93. [2021-11-03 04:09:06,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 72 states have internal predecessors, (77), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (25), 12 states have call predecessors, (25), 10 states have call successors, (25) [2021-11-03 04:09:06,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 113 transitions. [2021-11-03 04:09:06,590 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 113 transitions. Word has length 128 [2021-11-03 04:09:06,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:09:06,591 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 113 transitions. [2021-11-03 04:09:06,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.4) internal successors, (119), 35 states have internal predecessors, (119), 14 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (27), 23 states have call predecessors, (27), 14 states have call successors, (27) [2021-11-03 04:09:06,591 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 113 transitions. [2021-11-03 04:09:06,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2021-11-03 04:09:06,602 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:09:06,603 INFO L513 BasicCegarLoop]: trace histogram [49, 45, 40, 25, 25, 25, 25, 23, 23, 23, 23, 23, 22, 22, 21, 21, 15, 9, 1, 1, 1, 1] [2021-11-03 04:09:06,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-03 04:09:06,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:09:06,817 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:09:06,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:09:06,817 INFO L85 PathProgramCache]: Analyzing trace with hash -1327223165, now seen corresponding path program 6 times [2021-11-03 04:09:06,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:09:06,818 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858858972] [2021-11-03 04:09:06,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:09:06,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:09:06,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:09:07,223 INFO L134 CoverageAnalysis]: Checked inductivity of 7696 backedges. 572 proven. 1908 refuted. 0 times theorem prover too weak. 5216 trivial. 0 not checked. [2021-11-03 04:09:07,224 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:09:07,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858858972] [2021-11-03 04:09:07,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858858972] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:09:07,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309169636] [2021-11-03 04:09:07,225 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:09:07,225 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:09:07,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:09:07,227 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:09:07,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-03 04:09:08,200 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:09:08,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:09:08,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-03 04:09:08,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:09:09,729 INFO L134 CoverageAnalysis]: Checked inductivity of 7696 backedges. 3997 proven. 1274 refuted. 0 times theorem prover too weak. 2425 trivial. 0 not checked. [2021-11-03 04:09:09,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:09:12,306 INFO L134 CoverageAnalysis]: Checked inductivity of 7696 backedges. 663 proven. 2447 refuted. 0 times theorem prover too weak. 4586 trivial. 0 not checked. [2021-11-03 04:09:12,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309169636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:09:12,307 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1530913134] [2021-11-03 04:09:12,312 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:09:12,312 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:09:12,313 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:09:12,313 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:09:12,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 21] total 26 [2021-11-03 04:09:12,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243501145] [2021-11-03 04:09:12,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-03 04:09:12,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:09:12,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-03 04:09:12,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=541, Unknown=0, NotChecked=0, Total=650 [2021-11-03 04:09:12,320 INFO L87 Difference]: Start difference. First operand 93 states and 113 transitions. Second operand has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) [2021-11-03 04:09:13,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:09:13,059 INFO L93 Difference]: Finished difference Result 220 states and 289 transitions. [2021-11-03 04:09:13,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-03 04:09:13,060 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) Word has length 463 [2021-11-03 04:09:13,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:09:13,063 INFO L225 Difference]: With dead ends: 220 [2021-11-03 04:09:13,063 INFO L226 Difference]: Without dead ends: 132 [2021-11-03 04:09:13,066 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 922 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=568, Invalid=1502, Unknown=0, NotChecked=0, Total=2070 [2021-11-03 04:09:13,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-03 04:09:13,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 119. [2021-11-03 04:09:13,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 96 states have (on average 1.0520833333333333) internal successors, (101), 92 states have internal predecessors, (101), 14 states have call successors, (14), 11 states have call predecessors, (14), 8 states have return successors, (32), 15 states have call predecessors, (32), 13 states have call successors, (32) [2021-11-03 04:09:13,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 147 transitions. [2021-11-03 04:09:13,086 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 147 transitions. Word has length 463 [2021-11-03 04:09:13,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:09:13,087 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 147 transitions. [2021-11-03 04:09:13,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.961538461538462) internal successors, (155), 26 states have internal predecessors, (155), 21 states have call successors, (28), 4 states have call predecessors, (28), 10 states have return successors, (31), 12 states have call predecessors, (31), 19 states have call successors, (31) [2021-11-03 04:09:13,088 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 147 transitions. [2021-11-03 04:09:13,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-03 04:09:13,093 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:09:13,094 INFO L513 BasicCegarLoop]: trace histogram [28, 26, 23, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 12, 12, 9, 5, 1, 1, 1, 1] [2021-11-03 04:09:13,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-03 04:09:13,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-03 04:09:13,308 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:09:13,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:09:13,309 INFO L85 PathProgramCache]: Analyzing trace with hash -671966067, now seen corresponding path program 7 times [2021-11-03 04:09:13,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:09:13,309 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120273438] [2021-11-03 04:09:13,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:09:13,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:09:13,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:09:13,551 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 574 proven. 350 refuted. 0 times theorem prover too weak. 1542 trivial. 0 not checked. [2021-11-03 04:09:13,552 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:09:13,552 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120273438] [2021-11-03 04:09:13,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120273438] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:09:13,552 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798056186] [2021-11-03 04:09:13,553 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:09:13,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:09:13,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:09:13,555 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:09:13,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-03 04:09:14,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:09:14,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-03 04:09:14,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:09:15,494 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 1242 proven. 484 refuted. 0 times theorem prover too weak. 740 trivial. 0 not checked. [2021-11-03 04:09:15,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:09:17,813 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 534 proven. 831 refuted. 0 times theorem prover too weak. 1101 trivial. 0 not checked. [2021-11-03 04:09:17,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [798056186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:09:17,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133329067] [2021-11-03 04:09:17,818 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:09:17,818 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:09:17,819 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:09:17,820 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:09:17,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 19] total 24 [2021-11-03 04:09:17,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215361923] [2021-11-03 04:09:17,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-03 04:09:17,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:09:17,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-03 04:09:17,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-03 04:09:17,825 INFO L87 Difference]: Start difference. First operand 119 states and 147 transitions. Second operand has 24 states, 24 states have (on average 5.833333333333333) internal successors, (140), 24 states have internal predecessors, (140), 18 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (32), 12 states have call predecessors, (32), 18 states have call successors, (32) [2021-11-03 04:09:18,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:09:18,413 INFO L93 Difference]: Finished difference Result 231 states and 296 transitions. [2021-11-03 04:09:18,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-03 04:09:18,417 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.833333333333333) internal successors, (140), 24 states have internal predecessors, (140), 18 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (32), 12 states have call predecessors, (32), 18 states have call successors, (32) Word has length 266 [2021-11-03 04:09:18,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:09:18,419 INFO L225 Difference]: With dead ends: 231 [2021-11-03 04:09:18,419 INFO L226 Difference]: Without dead ends: 117 [2021-11-03 04:09:18,421 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 522 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=349, Invalid=911, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 04:09:18,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-03 04:09:18,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 105. [2021-11-03 04:09:18,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 82 states have internal predecessors, (87), 13 states have call successors, (13), 10 states have call predecessors, (13), 7 states have return successors, (26), 12 states have call predecessors, (26), 12 states have call successors, (26) [2021-11-03 04:09:18,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 126 transitions. [2021-11-03 04:09:18,433 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 126 transitions. Word has length 266 [2021-11-03 04:09:18,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:09:18,434 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 126 transitions. [2021-11-03 04:09:18,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.833333333333333) internal successors, (140), 24 states have internal predecessors, (140), 18 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (32), 12 states have call predecessors, (32), 18 states have call successors, (32) [2021-11-03 04:09:18,435 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 126 transitions. [2021-11-03 04:09:18,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 746 [2021-11-03 04:09:18,467 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:09:18,467 INFO L513 BasicCegarLoop]: trace histogram [77, 75, 62, 38, 38, 38, 38, 38, 38, 38, 38, 38, 37, 37, 36, 36, 24, 15, 1, 1, 1, 1] [2021-11-03 04:09:18,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-03 04:09:18,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-03 04:09:18,692 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:09:18,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:09:18,693 INFO L85 PathProgramCache]: Analyzing trace with hash -1908612362, now seen corresponding path program 8 times [2021-11-03 04:09:18,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:09:18,694 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339994445] [2021-11-03 04:09:18,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:09:18,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:09:18,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:09:19,255 INFO L134 CoverageAnalysis]: Checked inductivity of 20176 backedges. 1135 proven. 4435 refuted. 0 times theorem prover too weak. 14606 trivial. 0 not checked. [2021-11-03 04:09:19,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:09:19,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339994445] [2021-11-03 04:09:19,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [339994445] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:09:19,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051433819] [2021-11-03 04:09:19,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:09:19,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:09:19,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:09:19,258 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:09:19,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-03 04:09:20,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-03 04:09:20,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:09:20,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 958 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-03 04:09:20,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:09:23,226 INFO L134 CoverageAnalysis]: Checked inductivity of 20176 backedges. 6000 proven. 1712 refuted. 0 times theorem prover too weak. 12464 trivial. 0 not checked. [2021-11-03 04:09:23,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:09:33,559 INFO L134 CoverageAnalysis]: Checked inductivity of 20176 backedges. 6467 proven. 1550 refuted. 0 times theorem prover too weak. 12159 trivial. 0 not checked. [2021-11-03 04:09:33,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051433819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:09:33,560 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [976964480] [2021-11-03 04:09:33,562 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:09:33,563 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:09:33,563 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:09:33,564 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:09:33,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 32] total 56 [2021-11-03 04:09:33,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866132479] [2021-11-03 04:09:33,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-03 04:09:33,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:09:33,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-03 04:09:33,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=2675, Unknown=0, NotChecked=0, Total=3080 [2021-11-03 04:09:33,572 INFO L87 Difference]: Start difference. First operand 105 states and 126 transitions. Second operand has 56 states, 56 states have (on average 3.482142857142857) internal successors, (195), 56 states have internal predecessors, (195), 23 states have call successors, (27), 2 states have call predecessors, (27), 21 states have return successors, (48), 40 states have call predecessors, (48), 22 states have call successors, (48) [2021-11-03 04:09:36,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:09:36,484 INFO L93 Difference]: Finished difference Result 324 states and 465 transitions. [2021-11-03 04:09:36,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-03 04:09:36,486 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.482142857142857) internal successors, (195), 56 states have internal predecessors, (195), 23 states have call successors, (27), 2 states have call predecessors, (27), 21 states have return successors, (48), 40 states have call predecessors, (48), 22 states have call successors, (48) Word has length 745 [2021-11-03 04:09:36,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:09:36,490 INFO L225 Difference]: With dead ends: 324 [2021-11-03 04:09:36,490 INFO L226 Difference]: Without dead ends: 224 [2021-11-03 04:09:36,501 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1580 GetRequests, 1464 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4415 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2014, Invalid=11792, Unknown=0, NotChecked=0, Total=13806 [2021-11-03 04:09:36,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-03 04:09:36,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 191. [2021-11-03 04:09:36,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 153 states have (on average 1.0326797385620916) internal successors, (158), 149 states have internal predecessors, (158), 23 states have call successors, (23), 14 states have call predecessors, (23), 14 states have return successors, (90), 27 states have call predecessors, (90), 22 states have call successors, (90) [2021-11-03 04:09:36,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 271 transitions. [2021-11-03 04:09:36,525 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 271 transitions. Word has length 745 [2021-11-03 04:09:36,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:09:36,529 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 271 transitions. [2021-11-03 04:09:36,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.482142857142857) internal successors, (195), 56 states have internal predecessors, (195), 23 states have call successors, (27), 2 states have call predecessors, (27), 21 states have return successors, (48), 40 states have call predecessors, (48), 22 states have call successors, (48) [2021-11-03 04:09:36,530 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 271 transitions. [2021-11-03 04:09:36,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1006 [2021-11-03 04:09:36,546 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:09:36,547 INFO L513 BasicCegarLoop]: trace histogram [103, 102, 83, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 50, 50, 32, 20, 1, 1, 1, 1] [2021-11-03 04:09:36,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-03 04:09:36,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-03 04:09:36,760 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:09:36,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:09:36,761 INFO L85 PathProgramCache]: Analyzing trace with hash 1569091205, now seen corresponding path program 9 times [2021-11-03 04:09:36,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:09:36,762 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030135171] [2021-11-03 04:09:36,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:09:36,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:09:36,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:09:37,510 INFO L134 CoverageAnalysis]: Checked inductivity of 36911 backedges. 2753 proven. 6671 refuted. 0 times theorem prover too weak. 27487 trivial. 0 not checked. [2021-11-03 04:09:37,510 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:09:37,510 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030135171] [2021-11-03 04:09:37,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030135171] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:09:37,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045545869] [2021-11-03 04:09:37,511 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:09:37,511 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:09:37,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:09:37,517 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:09:37,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-03 04:09:39,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:09:39,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:09:39,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 04:09:39,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:09:42,087 INFO L134 CoverageAnalysis]: Checked inductivity of 36911 backedges. 3257 proven. 7544 refuted. 0 times theorem prover too weak. 26110 trivial. 0 not checked. [2021-11-03 04:09:42,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:09:48,472 INFO L134 CoverageAnalysis]: Checked inductivity of 36911 backedges. 3257 proven. 7712 refuted. 0 times theorem prover too weak. 25942 trivial. 0 not checked. [2021-11-03 04:09:48,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045545869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:09:48,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2139832622] [2021-11-03 04:09:48,474 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:09:48,475 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:09:48,475 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:09:48,475 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:09:48,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 31] total 36 [2021-11-03 04:09:48,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762984685] [2021-11-03 04:09:48,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-03 04:09:48,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:09:48,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-03 04:09:48,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1052, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 04:09:48,480 INFO L87 Difference]: Start difference. First operand 191 states and 271 transitions. Second operand has 36 states, 36 states have (on average 5.666666666666667) internal successors, (204), 36 states have internal predecessors, (204), 30 states have call successors, (35), 1 states have call predecessors, (35), 15 states have return successors, (46), 18 states have call predecessors, (46), 30 states have call successors, (46) [2021-11-03 04:09:49,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:09:49,827 INFO L93 Difference]: Finished difference Result 396 states and 657 transitions. [2021-11-03 04:09:49,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-03 04:09:49,828 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.666666666666667) internal successors, (204), 36 states have internal predecessors, (204), 30 states have call successors, (35), 1 states have call predecessors, (35), 15 states have return successors, (46), 18 states have call predecessors, (46), 30 states have call successors, (46) Word has length 1005 [2021-11-03 04:09:49,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:09:49,833 INFO L225 Difference]: With dead ends: 396 [2021-11-03 04:09:49,833 INFO L226 Difference]: Without dead ends: 210 [2021-11-03 04:09:49,839 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2071 GetRequests, 2004 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1076, Invalid=3346, Unknown=0, NotChecked=0, Total=4422 [2021-11-03 04:09:49,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-11-03 04:09:49,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 182. [2021-11-03 04:09:49,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 147 states have (on average 1.034013605442177) internal successors, (152), 143 states have internal predecessors, (152), 23 states have call successors, (23), 17 states have call predecessors, (23), 11 states have return successors, (64), 21 states have call predecessors, (64), 22 states have call successors, (64) [2021-11-03 04:09:49,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 239 transitions. [2021-11-03 04:09:49,862 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 239 transitions. Word has length 1005 [2021-11-03 04:09:49,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:09:49,864 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 239 transitions. [2021-11-03 04:09:49,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.666666666666667) internal successors, (204), 36 states have internal predecessors, (204), 30 states have call successors, (35), 1 states have call predecessors, (35), 15 states have return successors, (46), 18 states have call predecessors, (46), 30 states have call successors, (46) [2021-11-03 04:09:49,865 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 239 transitions. [2021-11-03 04:09:49,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1549 [2021-11-03 04:09:49,890 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:09:49,891 INFO L513 BasicCegarLoop]: trace histogram [160, 155, 130, 81, 81, 81, 81, 78, 78, 78, 78, 78, 77, 77, 76, 76, 49, 30, 1, 1, 1, 1] [2021-11-03 04:09:49,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-03 04:09:50,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:09:50,104 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:09:50,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:09:50,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1400744600, now seen corresponding path program 10 times [2021-11-03 04:09:50,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:09:50,106 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013234728] [2021-11-03 04:09:50,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:09:50,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:09:50,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:09:51,283 INFO L134 CoverageAnalysis]: Checked inductivity of 88129 backedges. 4049 proven. 11425 refuted. 0 times theorem prover too weak. 72655 trivial. 0 not checked. [2021-11-03 04:09:51,283 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:09:51,284 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013234728] [2021-11-03 04:09:51,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013234728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:09:51,284 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366102954] [2021-11-03 04:09:51,284 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:09:51,285 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:09:51,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:09:51,289 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:09:51,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-03 04:09:54,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:09:54,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 2890 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 04:09:54,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:09:58,102 INFO L134 CoverageAnalysis]: Checked inductivity of 88129 backedges. 19941 proven. 11076 refuted. 0 times theorem prover too weak. 57112 trivial. 0 not checked. [2021-11-03 04:09:58,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:10:05,465 INFO L134 CoverageAnalysis]: Checked inductivity of 88129 backedges. 5026 proven. 12975 refuted. 0 times theorem prover too weak. 70128 trivial. 0 not checked. [2021-11-03 04:10:05,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366102954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:10:05,465 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [907612775] [2021-11-03 04:10:05,469 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:10:05,469 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:10:05,470 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:10:05,471 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:10:05,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 31] total 36 [2021-11-03 04:10:05,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409408542] [2021-11-03 04:10:05,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-03 04:10:05,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:10:05,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-03 04:10:05,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1071, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 04:10:05,480 INFO L87 Difference]: Start difference. First operand 182 states and 239 transitions. Second operand has 36 states, 36 states have (on average 5.916666666666667) internal successors, (213), 36 states have internal predecessors, (213), 31 states have call successors, (38), 6 states have call predecessors, (38), 14 states have return successors, (43), 16 states have call predecessors, (43), 27 states have call successors, (43) [2021-11-03 04:10:06,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:10:06,891 INFO L93 Difference]: Finished difference Result 424 states and 617 transitions. [2021-11-03 04:10:06,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-03 04:10:06,892 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.916666666666667) internal successors, (213), 36 states have internal predecessors, (213), 31 states have call successors, (38), 6 states have call predecessors, (38), 14 states have return successors, (43), 16 states have call predecessors, (43), 27 states have call successors, (43) Word has length 1548 [2021-11-03 04:10:06,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:10:06,898 INFO L225 Difference]: With dead ends: 424 [2021-11-03 04:10:06,899 INFO L226 Difference]: Without dead ends: 247 [2021-11-03 04:10:06,904 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3167 GetRequests, 3095 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1145 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1309, Invalid=3803, Unknown=0, NotChecked=0, Total=5112 [2021-11-03 04:10:06,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-11-03 04:10:06,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 218. [2021-11-03 04:10:06,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 177 states have (on average 1.03954802259887) internal successors, (184), 172 states have internal predecessors, (184), 28 states have call successors, (28), 22 states have call predecessors, (28), 12 states have return successors, (84), 23 states have call predecessors, (84), 27 states have call successors, (84) [2021-11-03 04:10:06,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 296 transitions. [2021-11-03 04:10:06,928 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 296 transitions. Word has length 1548 [2021-11-03 04:10:06,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:10:06,931 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 296 transitions. [2021-11-03 04:10:06,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.916666666666667) internal successors, (213), 36 states have internal predecessors, (213), 31 states have call successors, (38), 6 states have call predecessors, (38), 14 states have return successors, (43), 16 states have call predecessors, (43), 27 states have call successors, (43) [2021-11-03 04:10:06,932 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 296 transitions. [2021-11-03 04:10:06,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 869 [2021-11-03 04:10:06,942 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:10:06,942 INFO L513 BasicCegarLoop]: trace histogram [89, 88, 72, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 43, 43, 28, 17, 1, 1, 1, 1] [2021-11-03 04:10:07,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-03 04:10:07,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:10:07,168 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:10:07,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:10:07,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1002130440, now seen corresponding path program 11 times [2021-11-03 04:10:07,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:10:07,169 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241567750] [2021-11-03 04:10:07,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:10:07,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:10:07,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:10:07,854 INFO L134 CoverageAnalysis]: Checked inductivity of 27461 backedges. 4114 proven. 2050 refuted. 0 times theorem prover too weak. 21297 trivial. 0 not checked. [2021-11-03 04:10:07,855 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:10:07,855 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241567750] [2021-11-03 04:10:07,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241567750] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:10:07,855 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937875085] [2021-11-03 04:10:07,856 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:10:07,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:10:07,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:10:07,858 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:10:07,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-03 04:10:11,210 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-11-03 04:10:11,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:10:11,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-03 04:10:11,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:10:13,102 INFO L134 CoverageAnalysis]: Checked inductivity of 27461 backedges. 3648 proven. 826 refuted. 0 times theorem prover too weak. 22987 trivial. 0 not checked. [2021-11-03 04:10:13,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:10:16,130 INFO L134 CoverageAnalysis]: Checked inductivity of 27461 backedges. 3648 proven. 872 refuted. 0 times theorem prover too weak. 22941 trivial. 0 not checked. [2021-11-03 04:10:16,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937875085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:10:16,130 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001148358] [2021-11-03 04:10:16,132 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:10:16,133 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:10:16,133 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:10:16,135 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:10:16,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12, 17] total 26 [2021-11-03 04:10:16,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862754226] [2021-11-03 04:10:16,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-03 04:10:16,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:10:16,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-03 04:10:16,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2021-11-03 04:10:16,140 INFO L87 Difference]: Start difference. First operand 218 states and 296 transitions. Second operand has 26 states, 26 states have (on average 5.615384615384615) internal successors, (146), 26 states have internal predecessors, (146), 15 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 20 states have call predecessors, (34), 15 states have call successors, (34) [2021-11-03 04:10:16,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:10:16,993 INFO L93 Difference]: Finished difference Result 445 states and 627 transitions. [2021-11-03 04:10:16,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-03 04:10:16,994 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.615384615384615) internal successors, (146), 26 states have internal predecessors, (146), 15 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 20 states have call predecessors, (34), 15 states have call successors, (34) Word has length 868 [2021-11-03 04:10:16,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:10:16,998 INFO L225 Difference]: With dead ends: 445 [2021-11-03 04:10:16,998 INFO L226 Difference]: Without dead ends: 232 [2021-11-03 04:10:17,001 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1779 GetRequests, 1732 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=559, Invalid=1603, Unknown=0, NotChecked=0, Total=2162 [2021-11-03 04:10:17,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-03 04:10:17,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 189. [2021-11-03 04:10:17,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 153 states have (on average 1.0326797385620916) internal successors, (158), 150 states have internal predecessors, (158), 25 states have call successors, (25), 20 states have call predecessors, (25), 10 states have return successors, (63), 18 states have call predecessors, (63), 24 states have call successors, (63) [2021-11-03 04:10:17,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 246 transitions. [2021-11-03 04:10:17,017 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 246 transitions. Word has length 868 [2021-11-03 04:10:17,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:10:17,019 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 246 transitions. [2021-11-03 04:10:17,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.615384615384615) internal successors, (146), 26 states have internal predecessors, (146), 15 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 20 states have call predecessors, (34), 15 states have call successors, (34) [2021-11-03 04:10:17,019 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 246 transitions. [2021-11-03 04:10:17,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 908 [2021-11-03 04:10:17,028 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:10:17,029 INFO L513 BasicCegarLoop]: trace histogram [93, 92, 75, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 45, 45, 29, 18, 1, 1, 1, 1] [2021-11-03 04:10:17,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-03 04:10:17,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-03 04:10:17,252 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:10:17,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:10:17,253 INFO L85 PathProgramCache]: Analyzing trace with hash -1110908200, now seen corresponding path program 12 times [2021-11-03 04:10:17,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:10:17,253 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394303080] [2021-11-03 04:10:17,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:10:17,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:10:17,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:10:17,896 INFO L134 CoverageAnalysis]: Checked inductivity of 30008 backedges. 3304 proven. 5088 refuted. 0 times theorem prover too weak. 21616 trivial. 0 not checked. [2021-11-03 04:10:17,896 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:10:17,896 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394303080] [2021-11-03 04:10:17,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394303080] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:10:17,897 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638777530] [2021-11-03 04:10:17,897 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:10:17,897 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:10:17,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:10:17,899 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:10:17,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-03 04:10:21,698 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:10:21,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:10:21,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 1127 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-03 04:10:21,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:10:23,583 INFO L134 CoverageAnalysis]: Checked inductivity of 30008 backedges. 3735 proven. 5527 refuted. 0 times theorem prover too weak. 20746 trivial. 0 not checked. [2021-11-03 04:10:23,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:10:29,016 INFO L134 CoverageAnalysis]: Checked inductivity of 30008 backedges. 3735 proven. 5699 refuted. 0 times theorem prover too weak. 20574 trivial. 0 not checked. [2021-11-03 04:10:29,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638777530] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:10:29,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1113636720] [2021-11-03 04:10:29,018 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:10:29,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:10:29,019 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:10:29,020 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:10:29,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 31] total 36 [2021-11-03 04:10:29,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950314988] [2021-11-03 04:10:29,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-03 04:10:29,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:10:29,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-03 04:10:29,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=1041, Unknown=0, NotChecked=0, Total=1260 [2021-11-03 04:10:29,025 INFO L87 Difference]: Start difference. First operand 189 states and 246 transitions. Second operand has 36 states, 36 states have (on average 5.444444444444445) internal successors, (196), 36 states have internal predecessors, (196), 29 states have call successors, (33), 1 states have call predecessors, (33), 15 states have return successors, (44), 17 states have call predecessors, (44), 29 states have call successors, (44) [2021-11-03 04:10:30,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:10:30,001 INFO L93 Difference]: Finished difference Result 398 states and 537 transitions. [2021-11-03 04:10:30,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-03 04:10:30,002 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.444444444444445) internal successors, (196), 36 states have internal predecessors, (196), 29 states have call successors, (33), 1 states have call predecessors, (33), 15 states have return successors, (44), 17 states have call predecessors, (44), 29 states have call successors, (44) Word has length 907 [2021-11-03 04:10:30,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:10:30,006 INFO L225 Difference]: With dead ends: 398 [2021-11-03 04:10:30,007 INFO L226 Difference]: Without dead ends: 214 [2021-11-03 04:10:30,010 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1863 GetRequests, 1806 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=805, Invalid=2387, Unknown=0, NotChecked=0, Total=3192 [2021-11-03 04:10:30,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-03 04:10:30,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 166. [2021-11-03 04:10:30,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 133 states have (on average 1.0225563909774436) internal successors, (136), 132 states have internal predecessors, (136), 22 states have call successors, (22), 16 states have call predecessors, (22), 10 states have return successors, (56), 17 states have call predecessors, (56), 21 states have call successors, (56) [2021-11-03 04:10:30,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 214 transitions. [2021-11-03 04:10:30,025 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 214 transitions. Word has length 907 [2021-11-03 04:10:30,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:10:30,027 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 214 transitions. [2021-11-03 04:10:30,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.444444444444445) internal successors, (196), 36 states have internal predecessors, (196), 29 states have call successors, (33), 1 states have call predecessors, (33), 15 states have return successors, (44), 17 states have call predecessors, (44), 29 states have call successors, (44) [2021-11-03 04:10:30,027 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 214 transitions. [2021-11-03 04:10:30,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1065 [2021-11-03 04:10:30,054 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:10:30,055 INFO L513 BasicCegarLoop]: trace histogram [109, 108, 88, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 53, 53, 34, 21, 1, 1, 1, 1] [2021-11-03 04:10:30,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-03 04:10:30,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:10:30,268 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:10:30,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:10:30,269 INFO L85 PathProgramCache]: Analyzing trace with hash -1503244552, now seen corresponding path program 13 times [2021-11-03 04:10:30,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:10:30,269 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817132925] [2021-11-03 04:10:30,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:10:30,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:10:30,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:10:31,814 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 6794 proven. 10214 refuted. 0 times theorem prover too weak. 24405 trivial. 0 not checked. [2021-11-03 04:10:31,815 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:10:31,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817132925] [2021-11-03 04:10:31,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817132925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:10:31,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793256540] [2021-11-03 04:10:31,816 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:10:31,816 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:10:31,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:10:31,817 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:10:31,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-03 04:10:36,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:10:36,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 1999 conjuncts, 217 conjunts are in the unsatisfiable core [2021-11-03 04:10:36,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:10:39,604 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 6686 proven. 7802 refuted. 0 times theorem prover too weak. 26925 trivial. 0 not checked. [2021-11-03 04:10:39,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:11:11,712 INFO L134 CoverageAnalysis]: Checked inductivity of 41413 backedges. 7863 proven. 7339 refuted. 0 times theorem prover too weak. 26211 trivial. 0 not checked. [2021-11-03 04:11:11,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793256540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:11:11,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [167232734] [2021-11-03 04:11:11,715 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:11:11,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:11:11,715 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:11:11,717 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:11:11,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 41] total 59 [2021-11-03 04:11:11,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613459386] [2021-11-03 04:11:11,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-03 04:11:11,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:11:11,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-03 04:11:11,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=2770, Unknown=0, NotChecked=0, Total=3540 [2021-11-03 04:11:11,724 INFO L87 Difference]: Start difference. First operand 166 states and 214 transitions. Second operand has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) [2021-11-03 04:11:12,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:11:12,132 INFO L93 Difference]: Finished difference Result 197 states and 270 transitions. [2021-11-03 04:11:12,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-03 04:11:12,133 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) Word has length 1064 [2021-11-03 04:11:12,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:11:12,139 INFO L225 Difference]: With dead ends: 197 [2021-11-03 04:11:12,139 INFO L226 Difference]: Without dead ends: 196 [2021-11-03 04:11:12,141 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2347 GetRequests, 2285 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1749 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=871, Invalid=3161, Unknown=0, NotChecked=0, Total=4032 [2021-11-03 04:11:12,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-03 04:11:12,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 186. [2021-11-03 04:11:12,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 149 states have (on average 1.0201342281879195) internal successors, (152), 147 states have internal predecessors, (152), 24 states have call successors, (24), 16 states have call predecessors, (24), 12 states have return successors, (80), 22 states have call predecessors, (80), 23 states have call successors, (80) [2021-11-03 04:11:12,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 256 transitions. [2021-11-03 04:11:12,160 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 256 transitions. Word has length 1064 [2021-11-03 04:11:12,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:11:12,162 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 256 transitions. [2021-11-03 04:11:12,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 2.5254237288135593) internal successors, (149), 60 states have internal predecessors, (149), 16 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (41), 41 states have call predecessors, (41), 16 states have call successors, (41) [2021-11-03 04:11:12,163 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 256 transitions. [2021-11-03 04:11:12,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3236 [2021-11-03 04:11:12,263 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:11:12,265 INFO L513 BasicCegarLoop]: trace histogram [332, 327, 269, 167, 167, 167, 167, 164, 164, 164, 164, 164, 163, 163, 162, 162, 102, 63, 1, 1, 1, 1] [2021-11-03 04:11:12,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-03 04:11:12,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-03 04:11:12,487 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:11:12,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:11:12,488 INFO L85 PathProgramCache]: Analyzing trace with hash 2125145978, now seen corresponding path program 14 times [2021-11-03 04:11:12,488 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:11:12,488 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091918279] [2021-11-03 04:11:12,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:11:12,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:11:13,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:11:15,407 INFO L134 CoverageAnalysis]: Checked inductivity of 387034 backedges. 7519 proven. 31465 refuted. 0 times theorem prover too weak. 348050 trivial. 0 not checked. [2021-11-03 04:11:15,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:11:15,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091918279] [2021-11-03 04:11:15,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091918279] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:11:15,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22033888] [2021-11-03 04:11:15,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:11:15,409 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:11:15,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:11:15,410 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:11:15,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-03 04:11:23,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 172 check-sat command(s) [2021-11-03 04:11:23,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:11:23,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 4241 conjuncts, 437 conjunts are in the unsatisfiable core [2021-11-03 04:11:23,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:11:33,189 INFO L134 CoverageAnalysis]: Checked inductivity of 387034 backedges. 117453 proven. 31331 refuted. 0 times theorem prover too weak. 238250 trivial. 0 not checked. [2021-11-03 04:11:33,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:13:23,526 INFO L134 CoverageAnalysis]: Checked inductivity of 387034 backedges. 120155 proven. 30143 refuted. 0 times theorem prover too weak. 236736 trivial. 0 not checked. [2021-11-03 04:13:23,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22033888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:13:23,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253466237] [2021-11-03 04:13:23,530 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:13:23,530 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:13:23,531 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:13:23,532 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:13:23,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 27, 50] total 83 [2021-11-03 04:13:23,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431892296] [2021-11-03 04:13:23,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-03 04:13:23,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:13:23,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-03 04:13:23,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=879, Invalid=5927, Unknown=0, NotChecked=0, Total=6806 [2021-11-03 04:13:23,547 INFO L87 Difference]: Start difference. First operand 186 states and 256 transitions. Second operand has 83 states, 83 states have (on average 3.397590361445783) internal successors, (282), 83 states have internal predecessors, (282), 35 states have call successors, (39), 5 states have call predecessors, (39), 30 states have return successors, (69), 58 states have call predecessors, (69), 31 states have call successors, (69) [2021-11-03 04:13:27,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:13:27,619 INFO L93 Difference]: Finished difference Result 497 states and 790 transitions. [2021-11-03 04:13:27,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-11-03 04:13:27,624 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.397590361445783) internal successors, (282), 83 states have internal predecessors, (282), 35 states have call successors, (39), 5 states have call predecessors, (39), 30 states have return successors, (69), 58 states have call predecessors, (69), 31 states have call successors, (69) Word has length 3235 [2021-11-03 04:13:27,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:13:27,631 INFO L225 Difference]: With dead ends: 497 [2021-11-03 04:13:27,631 INFO L226 Difference]: Without dead ends: 316 [2021-11-03 04:13:27,638 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6593 GetRequests, 6429 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9503 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3790, Invalid=23600, Unknown=0, NotChecked=0, Total=27390 [2021-11-03 04:13:27,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2021-11-03 04:13:27,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 272. [2021-11-03 04:13:27,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 219 states have (on average 1.0228310502283104) internal successors, (224), 215 states have internal predecessors, (224), 35 states have call successors, (35), 23 states have call predecessors, (35), 17 states have return successors, (147), 33 states have call predecessors, (147), 34 states have call successors, (147) [2021-11-03 04:13:27,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 406 transitions. [2021-11-03 04:13:27,667 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 406 transitions. Word has length 3235 [2021-11-03 04:13:27,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:13:27,669 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 406 transitions. [2021-11-03 04:13:27,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.397590361445783) internal successors, (282), 83 states have internal predecessors, (282), 35 states have call successors, (39), 5 states have call predecessors, (39), 30 states have return successors, (69), 58 states have call predecessors, (69), 31 states have call successors, (69) [2021-11-03 04:13:27,670 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 406 transitions. [2021-11-03 04:13:27,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3386 [2021-11-03 04:13:27,811 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:13:27,813 INFO L513 BasicCegarLoop]: trace histogram [346, 344, 280, 173, 173, 173, 173, 172, 172, 172, 172, 172, 172, 172, 171, 171, 107, 66, 1, 1, 1, 1] [2021-11-03 04:13:27,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-03 04:13:28,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:13:28,014 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:13:28,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:13:28,015 INFO L85 PathProgramCache]: Analyzing trace with hash 377705160, now seen corresponding path program 15 times [2021-11-03 04:13:28,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:13:28,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338874753] [2021-11-03 04:13:28,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:13:28,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:13:29,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:13:31,252 INFO L134 CoverageAnalysis]: Checked inductivity of 423827 backedges. 19248 proven. 33785 refuted. 0 times theorem prover too weak. 370794 trivial. 0 not checked. [2021-11-03 04:13:31,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:13:31,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338874753] [2021-11-03 04:13:31,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338874753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:13:31,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976860706] [2021-11-03 04:13:31,255 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:13:31,255 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:13:31,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:13:31,256 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:13:31,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-03 04:13:40,537 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:13:40,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:13:40,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 4189 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-03 04:13:40,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:13:47,689 INFO L134 CoverageAnalysis]: Checked inductivity of 423827 backedges. 217538 proven. 10882 refuted. 0 times theorem prover too weak. 195407 trivial. 0 not checked. [2021-11-03 04:13:47,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:14:07,463 INFO L134 CoverageAnalysis]: Checked inductivity of 423827 backedges. 12479 proven. 38869 refuted. 0 times theorem prover too weak. 372479 trivial. 0 not checked. [2021-11-03 04:14:07,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976860706] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:14:07,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [628547376] [2021-11-03 04:14:07,468 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:14:07,468 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:14:07,469 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:14:07,470 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:14:07,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 35] total 40 [2021-11-03 04:14:07,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912549201] [2021-11-03 04:14:07,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-03 04:14:07,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:14:07,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-03 04:14:07,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=1285, Unknown=0, NotChecked=0, Total=1560 [2021-11-03 04:14:07,483 INFO L87 Difference]: Start difference. First operand 272 states and 406 transitions. Second operand has 40 states, 40 states have (on average 6.2) internal successors, (248), 40 states have internal predecessors, (248), 37 states have call successors, (42), 2 states have call predecessors, (42), 20 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) [2021-11-03 04:14:09,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:14:09,127 INFO L93 Difference]: Finished difference Result 573 states and 977 transitions. [2021-11-03 04:14:09,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-03 04:14:09,129 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 6.2) internal successors, (248), 40 states have internal predecessors, (248), 37 states have call successors, (42), 2 states have call predecessors, (42), 20 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) Word has length 3385 [2021-11-03 04:14:09,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:14:09,147 INFO L225 Difference]: With dead ends: 573 [2021-11-03 04:14:09,147 INFO L226 Difference]: Without dead ends: 306 [2021-11-03 04:14:09,152 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6834 GetRequests, 6768 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 911 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1049, Invalid=3241, Unknown=0, NotChecked=0, Total=4290 [2021-11-03 04:14:09,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-11-03 04:14:09,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 210. [2021-11-03 04:14:09,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 169 states have (on average 1.017751479289941) internal successors, (172), 167 states have internal predecessors, (172), 28 states have call successors, (28), 20 states have call predecessors, (28), 12 states have return successors, (84), 22 states have call predecessors, (84), 27 states have call successors, (84) [2021-11-03 04:14:09,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 284 transitions. [2021-11-03 04:14:09,183 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 284 transitions. Word has length 3385 [2021-11-03 04:14:09,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:14:09,185 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 284 transitions. [2021-11-03 04:14:09,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 6.2) internal successors, (248), 40 states have internal predecessors, (248), 37 states have call successors, (42), 2 states have call predecessors, (42), 20 states have return successors, (58), 21 states have call predecessors, (58), 37 states have call successors, (58) [2021-11-03 04:14:09,186 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 284 transitions. [2021-11-03 04:14:09,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3478 [2021-11-03 04:14:09,295 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:14:09,297 INFO L513 BasicCegarLoop]: trace histogram [355, 354, 287, 177, 177, 177, 177, 177, 177, 177, 177, 177, 177, 177, 176, 176, 110, 68, 1, 1, 1, 1] [2021-11-03 04:14:09,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-03 04:14:09,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-03 04:14:09,520 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:14:09,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:14:09,522 INFO L85 PathProgramCache]: Analyzing trace with hash 1826742071, now seen corresponding path program 16 times [2021-11-03 04:14:09,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:14:09,522 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158450515] [2021-11-03 04:14:09,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:14:09,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:14:11,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:14:12,829 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 15910 proven. 36900 refuted. 0 times theorem prover too weak. 394447 trivial. 0 not checked. [2021-11-03 04:14:12,829 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:14:12,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158450515] [2021-11-03 04:14:12,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158450515] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:14:12,830 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745164540] [2021-11-03 04:14:12,830 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-03 04:14:12,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:14:12,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:14:12,831 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:14:12,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-03 04:14:24,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:14:24,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 6456 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-03 04:14:24,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:14:32,126 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 17974 proven. 38879 refuted. 0 times theorem prover too weak. 390404 trivial. 0 not checked. [2021-11-03 04:14:32,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:14:49,663 INFO L134 CoverageAnalysis]: Checked inductivity of 447257 backedges. 17974 proven. 39266 refuted. 0 times theorem prover too weak. 390017 trivial. 0 not checked. [2021-11-03 04:14:49,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745164540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:14:49,663 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2121793540] [2021-11-03 04:14:49,666 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:14:49,667 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:14:49,667 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:14:49,668 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:14:49,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 43] total 48 [2021-11-03 04:14:49,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298830506] [2021-11-03 04:14:49,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-03 04:14:49,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:14:49,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-03 04:14:49,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1907, Unknown=0, NotChecked=0, Total=2256 [2021-11-03 04:14:49,678 INFO L87 Difference]: Start difference. First operand 210 states and 284 transitions. Second operand has 48 states, 48 states have (on average 5.583333333333333) internal successors, (268), 48 states have internal predecessors, (268), 41 states have call successors, (45), 1 states have call predecessors, (45), 21 states have return successors, (62), 23 states have call predecessors, (62), 41 states have call successors, (62) [2021-11-03 04:14:51,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:14:51,357 INFO L93 Difference]: Finished difference Result 469 states and 696 transitions. [2021-11-03 04:14:51,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-03 04:14:51,358 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.583333333333333) internal successors, (268), 48 states have internal predecessors, (268), 41 states have call successors, (45), 1 states have call predecessors, (45), 21 states have return successors, (62), 23 states have call predecessors, (62), 41 states have call successors, (62) Word has length 3477 [2021-11-03 04:14:51,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:14:51,364 INFO L225 Difference]: With dead ends: 469 [2021-11-03 04:14:51,364 INFO L226 Difference]: Without dead ends: 264 [2021-11-03 04:14:51,368 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7040 GetRequests, 6946 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1996 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2024, Invalid=6718, Unknown=0, NotChecked=0, Total=8742 [2021-11-03 04:14:51,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-11-03 04:14:51,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 216. [2021-11-03 04:14:51,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 174 states have (on average 1.0172413793103448) internal successors, (177), 172 states have internal predecessors, (177), 29 states have call successors, (29), 21 states have call predecessors, (29), 12 states have return successors, (83), 22 states have call predecessors, (83), 28 states have call successors, (83) [2021-11-03 04:14:51,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 289 transitions. [2021-11-03 04:14:51,387 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 289 transitions. Word has length 3477 [2021-11-03 04:14:51,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:14:51,390 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 289 transitions. [2021-11-03 04:14:51,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.583333333333333) internal successors, (268), 48 states have internal predecessors, (268), 41 states have call successors, (45), 1 states have call predecessors, (45), 21 states have return successors, (62), 23 states have call predecessors, (62), 41 states have call successors, (62) [2021-11-03 04:14:51,391 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 289 transitions. [2021-11-03 04:14:51,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5642 [2021-11-03 04:14:51,622 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:14:51,624 INFO L513 BasicCegarLoop]: trace histogram [576, 574, 466, 288, 288, 288, 288, 287, 287, 287, 287, 287, 287, 287, 286, 286, 178, 110, 1, 1, 1, 1] [2021-11-03 04:14:51,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-03 04:14:51,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:14:51,825 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:14:51,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:14:51,827 INFO L85 PathProgramCache]: Analyzing trace with hash -1861799341, now seen corresponding path program 17 times [2021-11-03 04:14:51,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:14:51,827 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866451678] [2021-11-03 04:14:51,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:14:51,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:14:53,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:14:57,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 29084 proven. 67761 refuted. 0 times theorem prover too weak. 1082587 trivial. 0 not checked. [2021-11-03 04:14:57,751 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:14:57,751 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866451678] [2021-11-03 04:14:57,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866451678] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:14:57,752 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632432428] [2021-11-03 04:14:57,752 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-03 04:14:57,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:14:57,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:14:57,753 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:14:57,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-03 04:15:14,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 217 check-sat command(s) [2021-11-03 04:15:14,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:15:14,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 5551 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-03 04:15:14,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:15:26,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 28846 proven. 50938 refuted. 0 times theorem prover too weak. 1099648 trivial. 0 not checked. [2021-11-03 04:15:26,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:15:51,187 INFO L134 CoverageAnalysis]: Checked inductivity of 1179432 backedges. 28846 proven. 51278 refuted. 0 times theorem prover too weak. 1099308 trivial. 0 not checked. [2021-11-03 04:15:51,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632432428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:15:51,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [629088168] [2021-11-03 04:15:51,190 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-03 04:15:51,190 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:15:51,190 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-03 04:15:51,191 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-03 04:15:51,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 22, 37] total 47 [2021-11-03 04:15:51,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917458322] [2021-11-03 04:15:51,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-03 04:15:51,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:15:51,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-03 04:15:51,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=1818, Unknown=0, NotChecked=0, Total=2162 [2021-11-03 04:15:51,205 INFO L87 Difference]: Start difference. First operand 216 states and 289 transitions. Second operand has 47 states, 47 states have (on average 5.808510638297872) internal successors, (273), 47 states have internal predecessors, (273), 37 states have call successors, (46), 1 states have call predecessors, (46), 23 states have return successors, (67), 30 states have call predecessors, (67), 37 states have call successors, (67) [2021-11-03 04:15:53,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:15:53,039 INFO L93 Difference]: Finished difference Result 497 states and 736 transitions. [2021-11-03 04:15:53,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-03 04:15:53,040 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 5.808510638297872) internal successors, (273), 47 states have internal predecessors, (273), 37 states have call successors, (46), 1 states have call predecessors, (46), 23 states have return successors, (67), 30 states have call predecessors, (67), 37 states have call successors, (67) Word has length 5641 [2021-11-03 04:15:53,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:15:53,048 INFO L225 Difference]: With dead ends: 497 [2021-11-03 04:15:53,049 INFO L226 Difference]: Without dead ends: 286 [2021-11-03 04:15:53,054 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11378 GetRequests, 11280 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2226 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2139, Invalid=7367, Unknown=0, NotChecked=0, Total=9506 [2021-11-03 04:15:53,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-03 04:15:53,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 229. [2021-11-03 04:15:53,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 184 states have (on average 1.016304347826087) internal successors, (187), 183 states have internal predecessors, (187), 31 states have call successors, (31), 22 states have call predecessors, (31), 13 states have return successors, (95), 23 states have call predecessors, (95), 30 states have call successors, (95) [2021-11-03 04:15:53,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 313 transitions. [2021-11-03 04:15:53,079 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 313 transitions. Word has length 5641 [2021-11-03 04:15:53,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:15:53,083 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 313 transitions. [2021-11-03 04:15:53,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 5.808510638297872) internal successors, (273), 47 states have internal predecessors, (273), 37 states have call successors, (46), 1 states have call predecessors, (46), 23 states have return successors, (67), 30 states have call predecessors, (67), 37 states have call successors, (67) [2021-11-03 04:15:53,084 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 313 transitions. [2021-11-03 04:15:53,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4563 [2021-11-03 04:15:53,295 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:15:53,297 INFO L513 BasicCegarLoop]: trace histogram [466, 464, 377, 233, 233, 233, 233, 232, 232, 232, 232, 232, 232, 232, 231, 231, 144, 89, 1, 1, 1, 1] [2021-11-03 04:15:53,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-03 04:15:53,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-03 04:15:53,498 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2021-11-03 04:15:53,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:15:53,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1835066212, now seen corresponding path program 18 times [2021-11-03 04:15:53,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:15:53,500 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603993162] [2021-11-03 04:15:53,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:15:53,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:15:56,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:16:01,386 INFO L134 CoverageAnalysis]: Checked inductivity of 770823 backedges. 134587 proven. 182534 refuted. 0 times theorem prover too weak. 453702 trivial. 0 not checked. [2021-11-03 04:16:01,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:16:01,386 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603993162] [2021-11-03 04:16:01,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603993162] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:16:01,386 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331660231] [2021-11-03 04:16:01,387 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-03 04:16:01,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:16:01,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:16:01,388 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:16:01,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f22c2c54-1ea3-4741-a18e-7ebea3521174/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-03 04:16:18,835 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-03 04:16:18,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-03 04:16:18,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 8459 conjuncts, 929 conjunts are in the unsatisfiable core [2021-11-03 04:16:19,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:16:33,378 INFO L134 CoverageAnalysis]: Checked inductivity of 770823 backedges. 132268 proven. 139641 refuted. 0 times theorem prover too weak. 498914 trivial. 0 not checked. [2021-11-03 04:16:33,378 INFO L328 TraceCheckSpWp]: Computing backward predicates...