./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci04.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs --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 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 14:21:01,182 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 14:21:01,185 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 14:21:01,248 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 14:21:01,248 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 14:21:01,252 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 14:21:01,254 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 14:21:01,259 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 14:21:01,261 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 14:21:01,269 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 14:21:01,270 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 14:21:01,272 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 14:21:01,273 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 14:21:01,276 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 14:21:01,278 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 14:21:01,284 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 14:21:01,286 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 14:21:01,287 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 14:21:01,290 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 14:21:01,299 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 14:21:01,301 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 14:21:01,306 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 14:21:01,310 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 14:21:01,311 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 14:21:01,321 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 14:21:01,321 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 14:21:01,322 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 14:21:01,324 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 14:21:01,325 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 14:21:01,326 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 14:21:01,327 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 14:21:01,328 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 14:21:01,330 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 14:21:01,331 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 14:21:01,333 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 14:21:01,333 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 14:21:01,334 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 14:21:01,335 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 14:21:01,335 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 14:21:01,336 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 14:21:01,337 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 14:21:01,338 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/config/svcomp-Overflow-32bit-Taipan_Default.epf [2021-11-19 14:21:01,384 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 14:21:01,385 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 14:21:01,386 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 14:21:01,386 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 14:21:01,387 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 14:21:01,387 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 14:21:01,387 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 14:21:01,387 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 14:21:01,387 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 14:21:01,388 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 14:21:01,389 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 14:21:01,389 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 14:21:01,389 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 14:21:01,390 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 14:21:01,390 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 14:21:01,390 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 14:21:01,391 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 14:21:01,391 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 14:21:01,391 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-19 14:21:01,391 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 14:21:01,392 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 14:21:01,392 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 14:21:01,392 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 14:21:01,392 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 14:21:01,392 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 14:21:01,393 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2021-11-19 14:21:01,393 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 14:21:01,393 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 14:21:01,393 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 14:21:01,395 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 14:21:01,395 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 14:21:01,395 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 14:21:01,396 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:21:01,396 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 14:21:01,396 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 14:21:01,397 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 14:21:01,397 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 14:21:01,397 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 14:21:01,397 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 14:21:01,397 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 14:21:01,398 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 14:21:01,398 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_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d19306ce3d42a6a85ce0e73aaa2bade9eaab24620b40f9180d62be222dc7b30 [2021-11-19 14:21:01,669 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 14:21:01,693 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 14:21:01,695 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 14:21:01,697 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 14:21:01,698 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 14:21:01,699 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/recursive/Fibonacci04.c [2021-11-19 14:21:01,785 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/data/96c5f8b17/fe8acd0e0d884ed083e2c6574947747c/FLAGc367defa1 [2021-11-19 14:21:02,281 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 14:21:02,283 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/sv-benchmarks/c/recursive/Fibonacci04.c [2021-11-19 14:21:02,296 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/data/96c5f8b17/fe8acd0e0d884ed083e2c6574947747c/FLAGc367defa1 [2021-11-19 14:21:02,645 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/data/96c5f8b17/fe8acd0e0d884ed083e2c6574947747c [2021-11-19 14:21:02,647 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 14:21:02,649 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 14:21:02,655 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 14:21:02,656 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 14:21:02,659 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 14:21:02,660 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,662 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4450c0c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02, skipping insertion in model container [2021-11-19 14:21:02,662 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,670 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 14:21:02,684 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 14:21:02,889 WARN L230 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_1ace93a5-e81e-4d28-95b6-26bd4651643d/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2021-11-19 14:21:02,890 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:21:02,899 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 14:21:02,915 WARN L230 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_1ace93a5-e81e-4d28-95b6-26bd4651643d/sv-benchmarks/c/recursive/Fibonacci04.c[780,793] [2021-11-19 14:21:02,916 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:21:02,930 INFO L208 MainTranslator]: Completed translation [2021-11-19 14:21:02,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02 WrapperNode [2021-11-19 14:21:02,931 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 14:21:02,932 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 14:21:02,933 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 14:21:02,933 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 14:21:02,941 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,947 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,962 INFO L137 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 23 [2021-11-19 14:21:02,962 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 14:21:02,963 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 14:21:02,963 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 14:21:02,964 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 14:21:02,972 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,972 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,973 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,974 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,976 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,978 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,979 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,981 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 14:21:02,982 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 14:21:02,982 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 14:21:02,982 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 14:21:02,983 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (1/1) ... [2021-11-19 14:21:02,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:21:03,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:03,019 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 14:21:03,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 14:21:03,058 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2021-11-19 14:21:03,058 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2021-11-19 14:21:03,058 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 14:21:03,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 14:21:03,058 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 14:21:03,058 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 14:21:03,123 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 14:21:03,124 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 14:21:03,244 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 14:21:03,266 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 14:21:03,266 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-19 14:21:03,268 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:21:03 BoogieIcfgContainer [2021-11-19 14:21:03,269 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 14:21:03,270 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 14:21:03,270 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 14:21:03,274 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 14:21:03,274 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 02:21:02" (1/3) ... [2021-11-19 14:21:03,275 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c952e2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:21:03, skipping insertion in model container [2021-11-19 14:21:03,275 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:21:02" (2/3) ... [2021-11-19 14:21:03,275 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c952e2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:21:03, skipping insertion in model container [2021-11-19 14:21:03,275 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:21:03" (3/3) ... [2021-11-19 14:21:03,277 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2021-11-19 14:21:03,282 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 14:21:03,282 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-19 14:21:03,333 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 14:21:03,340 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 [2021-11-19 14:21:03,341 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-19 14:21:03,374 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 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) [2021-11-19 14:21:03,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-19 14:21:03,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:03,380 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-19 14:21:03,381 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:03,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:03,387 INFO L85 PathProgramCache]: Analyzing trace with hash -2020330972, now seen corresponding path program 1 times [2021-11-19 14:21:03,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:03,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471972657] [2021-11-19 14:21:03,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:03,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:03,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:03,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 14:21:03,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:03,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471972657] [2021-11-19 14:21:03,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [471972657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:21:03,678 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:21:03,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 14:21:03,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939275897] [2021-11-19 14:21:03,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:21:03,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 14:21:03,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:03,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 14:21:03,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:21:03,728 INFO L87 Difference]: Start difference. First operand has 25 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 20 states have internal predecessors, (22), 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 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-19 14:21:03,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:03,867 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-11-19 14:21:03,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:21:03,870 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 6 [2021-11-19 14:21:03,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:03,878 INFO L225 Difference]: With dead ends: 25 [2021-11-19 14:21:03,878 INFO L226 Difference]: Without dead ends: 21 [2021-11-19 14:21:03,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-19 14:21:03,885 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:03,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 19 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:21:03,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-19 14:21:03,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-19 14:21:03,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 17 states have internal predecessors, (19), 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) [2021-11-19 14:21:03,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-11-19 14:21:03,942 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 6 [2021-11-19 14:21:03,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:03,943 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-11-19 14:21:03,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-19 14:21:03,943 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-11-19 14:21:03,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-19 14:21:03,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:03,945 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:21:03,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 14:21:03,946 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:03,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:03,947 INFO L85 PathProgramCache]: Analyzing trace with hash 1794249350, now seen corresponding path program 1 times [2021-11-19 14:21:03,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:03,947 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103243864] [2021-11-19 14:21:03,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:03,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:03,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:03,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 14:21:03,976 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:03,976 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103243864] [2021-11-19 14:21:03,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103243864] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:21:03,976 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:21:03,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-19 14:21:03,977 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66319301] [2021-11-19 14:21:03,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:21:03,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:21:03,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:03,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:21:03,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 14:21:03,980 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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) [2021-11-19 14:21:03,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:03,999 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2021-11-19 14:21:03,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:21:03,999 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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 [2021-11-19 14:21:04,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:04,002 INFO L225 Difference]: With dead ends: 23 [2021-11-19 14:21:04,002 INFO L226 Difference]: Without dead ends: 21 [2021-11-19 14:21:04,003 INFO L932 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 [2021-11-19 14:21:04,004 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 11 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:04,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 22 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:21:04,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-19 14:21:04,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-11-19 14:21:04,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 15 states have internal predecessors, (17), 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) [2021-11-19 14:21:04,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-19 14:21:04,014 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 7 [2021-11-19 14:21:04,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:04,015 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-19 14:21:04,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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) [2021-11-19 14:21:04,015 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-19 14:21:04,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-19 14:21:04,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:04,017 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:21:04,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 14:21:04,017 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:04,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:04,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1994508104, now seen corresponding path program 1 times [2021-11-19 14:21:04,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:04,019 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024427175] [2021-11-19 14:21:04,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:04,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:04,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:04,109 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 14:21:04,110 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:04,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024427175] [2021-11-19 14:21:04,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024427175] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:21:04,110 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:21:04,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 14:21:04,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114392966] [2021-11-19 14:21:04,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:21:04,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 14:21:04,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:04,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 14:21:04,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:21:04,114 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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) [2021-11-19 14:21:04,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:04,155 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2021-11-19 14:21:04,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:21:04,156 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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 22 [2021-11-19 14:21:04,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:04,157 INFO L225 Difference]: With dead ends: 35 [2021-11-19 14:21:04,158 INFO L226 Difference]: Without dead ends: 33 [2021-11-19 14:21:04,158 INFO L932 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 [2021-11-19 14:21:04,160 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:04,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 48 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:21:04,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-19 14:21:04,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2021-11-19 14:21:04,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 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) [2021-11-19 14:21:04,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-11-19 14:21:04,172 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 22 [2021-11-19 14:21:04,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:04,172 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-11-19 14:21:04,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 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) [2021-11-19 14:21:04,173 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-11-19 14:21:04,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-19 14:21:04,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:04,175 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:21:04,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 14:21:04,176 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:04,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:04,177 INFO L85 PathProgramCache]: Analyzing trace with hash 389206339, now seen corresponding path program 1 times [2021-11-19 14:21:04,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:04,178 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807834622] [2021-11-19 14:21:04,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:04,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:04,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:04,251 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-19 14:21:04,251 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:04,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807834622] [2021-11-19 14:21:04,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [807834622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:04,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359532365] [2021-11-19 14:21:04,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:04,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:04,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:04,255 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:04,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 14:21:04,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:04,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:21:04,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:04,472 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:21:04,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:04,655 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 14:21:04,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359532365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:04,656 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029997409] [2021-11-19 14:21:04,686 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-19 14:21:04,687 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:04,692 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:610) 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) [2021-11-19 14:21:04,695 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:04,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2021-11-19 14:21:04,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444139752] [2021-11-19 14:21:04,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:04,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 14:21:04,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:04,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 14:21:04,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-19 14:21:04,698 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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) [2021-11-19 14:21:04,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:04,997 INFO L93 Difference]: Finished difference Result 89 states and 127 transitions. [2021-11-19 14:21:04,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 14:21:04,998 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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 29 [2021-11-19 14:21:04,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:05,000 INFO L225 Difference]: With dead ends: 89 [2021-11-19 14:21:05,001 INFO L226 Difference]: Without dead ends: 63 [2021-11-19 14:21:05,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-11-19 14:21:05,004 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 171 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:05,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 55 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:21:05,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-19 14:21:05,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 51. [2021-11-19 14:21:05,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 40 states have internal predecessors, (41), 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) [2021-11-19 14:21:05,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 66 transitions. [2021-11-19 14:21:05,031 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 66 transitions. Word has length 29 [2021-11-19 14:21:05,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:05,032 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 66 transitions. [2021-11-19 14:21:05,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 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) [2021-11-19 14:21:05,033 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 66 transitions. [2021-11-19 14:21:05,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-19 14:21:05,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:05,035 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:21:05,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:05,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-19 14:21:05,250 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:05,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:05,250 INFO L85 PathProgramCache]: Analyzing trace with hash -294911484, now seen corresponding path program 2 times [2021-11-19 14:21:05,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:05,251 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729647379] [2021-11-19 14:21:05,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:05,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:05,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:05,331 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 14:21:05,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:05,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729647379] [2021-11-19 14:21:05,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1729647379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:05,334 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976169613] [2021-11-19 14:21:05,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:21:05,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:05,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:05,336 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:05,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 14:21:05,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-19 14:21:05,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:05,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 14:21:05,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:05,485 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 14:21:05,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:05,569 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 14:21:05,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976169613] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:21:05,569 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:21:05,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 9 [2021-11-19 14:21:05,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279344886] [2021-11-19 14:21:05,571 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:21:05,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 14:21:05,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:05,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 14:21:05,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:21:05,572 INFO L87 Difference]: Start difference. First operand 51 states and 66 transitions. Second operand has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-11-19 14:21:05,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:05,615 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2021-11-19 14:21:05,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 14:21:05,616 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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 23 [2021-11-19 14:21:05,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:05,622 INFO L225 Difference]: With dead ends: 59 [2021-11-19 14:21:05,622 INFO L226 Difference]: Without dead ends: 58 [2021-11-19 14:21:05,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-19 14:21:05,624 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 8 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:05,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 66 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:21:05,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-19 14:21:05,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2021-11-19 14:21:05,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 41 states have internal predecessors, (43), 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) [2021-11-19 14:21:05,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2021-11-19 14:21:05,653 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 23 [2021-11-19 14:21:05,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:05,653 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2021-11-19 14:21:05,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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) [2021-11-19 14:21:05,654 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2021-11-19 14:21:05,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-19 14:21:05,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:05,655 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:21:05,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:05,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:05,856 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:05,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:05,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1400919893, now seen corresponding path program 1 times [2021-11-19 14:21:05,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:05,857 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119960109] [2021-11-19 14:21:05,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:05,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:05,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:05,918 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-19 14:21:05,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:05,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119960109] [2021-11-19 14:21:05,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119960109] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:05,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072719622] [2021-11-19 14:21:05,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:05,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:05,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:05,920 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:05,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 14:21:05,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:05,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 14:21:05,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:06,087 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-19 14:21:06,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:06,200 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-19 14:21:06,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072719622] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:06,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1516870945] [2021-11-19 14:21:06,211 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:06,212 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:06,213 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:610) 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) [2021-11-19 14:21:06,216 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:06,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2021-11-19 14:21:06,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779583178] [2021-11-19 14:21:06,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:06,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-19 14:21:06,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:06,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-19 14:21:06,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-19 14:21:06,219 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 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) [2021-11-19 14:21:06,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:06,327 INFO L93 Difference]: Finished difference Result 68 states and 92 transitions. [2021-11-19 14:21:06,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 14:21:06,331 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 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 30 [2021-11-19 14:21:06,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:06,332 INFO L225 Difference]: With dead ends: 68 [2021-11-19 14:21:06,333 INFO L226 Difference]: Without dead ends: 67 [2021-11-19 14:21:06,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-19 14:21:06,334 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 15 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:06,334 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 126 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:21:06,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-19 14:21:06,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2021-11-19 14:21:06,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 50 states have internal predecessors, (54), 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) [2021-11-19 14:21:06,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2021-11-19 14:21:06,347 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 30 [2021-11-19 14:21:06,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:06,348 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2021-11-19 14:21:06,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.090909090909091) internal successors, (34), 12 states have internal predecessors, (34), 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) [2021-11-19 14:21:06,348 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2021-11-19 14:21:06,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-19 14:21:06,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:06,351 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-19 14:21:06,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:06,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-19 14:21:06,578 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:06,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:06,578 INFO L85 PathProgramCache]: Analyzing trace with hash 2054472853, now seen corresponding path program 1 times [2021-11-19 14:21:06,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:06,578 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097807731] [2021-11-19 14:21:06,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:06,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:06,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:06,666 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-19 14:21:06,666 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:06,667 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097807731] [2021-11-19 14:21:06,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097807731] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:06,667 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745302219] [2021-11-19 14:21:06,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:06,667 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:06,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:06,675 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:06,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 14:21:06,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:06,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 14:21:06,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:06,868 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-19 14:21:06,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:07,113 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-19 14:21:07,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745302219] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:07,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1717819148] [2021-11-19 14:21:07,128 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:07,128 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:07,129 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:610) 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) [2021-11-19 14:21:07,129 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:07,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2021-11-19 14:21:07,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688175696] [2021-11-19 14:21:07,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:07,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-19 14:21:07,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:07,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-19 14:21:07,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-19 14:21:07,131 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 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) [2021-11-19 14:21:07,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:07,393 INFO L93 Difference]: Finished difference Result 133 states and 198 transitions. [2021-11-19 14:21:07,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-19 14:21:07,394 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 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 43 [2021-11-19 14:21:07,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:07,408 INFO L225 Difference]: With dead ends: 133 [2021-11-19 14:21:07,408 INFO L226 Difference]: Without dead ends: 132 [2021-11-19 14:21:07,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-19 14:21:07,413 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 43 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:07,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 122 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:21:07,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-19 14:21:07,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 97. [2021-11-19 14:21:07,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 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) [2021-11-19 14:21:07,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2021-11-19 14:21:07,453 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 43 [2021-11-19 14:21:07,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:07,453 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2021-11-19 14:21:07,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 16 states have internal predecessors, (40), 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) [2021-11-19 14:21:07,454 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2021-11-19 14:21:07,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-19 14:21:07,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:07,457 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1] [2021-11-19 14:21:07,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:07,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:07,677 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:07,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:07,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1065907594, now seen corresponding path program 1 times [2021-11-19 14:21:07,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:07,678 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118910213] [2021-11-19 14:21:07,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:07,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:07,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:07,769 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-19 14:21:07,770 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:07,771 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118910213] [2021-11-19 14:21:07,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [118910213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:21:07,771 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:21:07,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 14:21:07,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799683523] [2021-11-19 14:21:07,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:21:07,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 14:21:07,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:07,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 14:21:07,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:21:07,774 INFO L87 Difference]: Start difference. First operand 97 states and 158 transitions. Second operand has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 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) [2021-11-19 14:21:07,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:07,806 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2021-11-19 14:21:07,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:21:07,807 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 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 62 [2021-11-19 14:21:07,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:07,809 INFO L225 Difference]: With dead ends: 110 [2021-11-19 14:21:07,809 INFO L226 Difference]: Without dead ends: 109 [2021-11-19 14:21:07,810 INFO L932 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 [2021-11-19 14:21:07,811 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:07,811 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 65 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:21:07,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-19 14:21:07,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 97. [2021-11-19 14:21:07,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 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) [2021-11-19 14:21:07,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2021-11-19 14:21:07,826 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 62 [2021-11-19 14:21:07,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:07,827 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2021-11-19 14:21:07,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 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) [2021-11-19 14:21:07,827 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2021-11-19 14:21:07,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-19 14:21:07,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:07,831 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1] [2021-11-19 14:21:07,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-19 14:21:07,831 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:07,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:07,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1825706635, now seen corresponding path program 2 times [2021-11-19 14:21:07,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:07,832 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14835370] [2021-11-19 14:21:07,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:07,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:07,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:07,905 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-11-19 14:21:07,905 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:07,905 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14835370] [2021-11-19 14:21:07,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14835370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:21:07,906 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:21:07,906 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 14:21:07,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723578362] [2021-11-19 14:21:07,906 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:21:07,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 14:21:07,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:07,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 14:21:07,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:21:07,908 INFO L87 Difference]: Start difference. First operand 97 states and 158 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) [2021-11-19 14:21:07,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:07,943 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2021-11-19 14:21:07,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:21:07,943 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 [2021-11-19 14:21:07,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:07,947 INFO L225 Difference]: With dead ends: 110 [2021-11-19 14:21:07,947 INFO L226 Difference]: Without dead ends: 109 [2021-11-19 14:21:07,948 INFO L932 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 [2021-11-19 14:21:07,951 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:07,951 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 42 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:21:07,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-19 14:21:07,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 97. [2021-11-19 14:21:07,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 75 states have (on average 1.08) internal successors, (81), 74 states have internal predecessors, (81), 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) [2021-11-19 14:21:07,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 158 transitions. [2021-11-19 14:21:07,978 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 158 transitions. Word has length 69 [2021-11-19 14:21:07,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:07,979 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 158 transitions. [2021-11-19 14:21:07,979 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) [2021-11-19 14:21:07,979 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 158 transitions. [2021-11-19 14:21:07,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-19 14:21:07,982 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:07,983 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1] [2021-11-19 14:21:07,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-19 14:21:07,983 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:07,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:07,984 INFO L85 PathProgramCache]: Analyzing trace with hash -255258321, now seen corresponding path program 2 times [2021-11-19 14:21:07,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:07,984 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406597175] [2021-11-19 14:21:07,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:07,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:08,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:08,217 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 56 proven. 165 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2021-11-19 14:21:08,218 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:08,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406597175] [2021-11-19 14:21:08,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406597175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:08,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238661170] [2021-11-19 14:21:08,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:21:08,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:08,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:08,220 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:08,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 14:21:08,276 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-19 14:21:08,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:08,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 14:21:08,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:08,597 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 184 proven. 85 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-11-19 14:21:08,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:09,286 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 184 proven. 88 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2021-11-19 14:21:09,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238661170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:09,287 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [505397350] [2021-11-19 14:21:09,291 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:09,292 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:09,292 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:610) 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) [2021-11-19 14:21:09,293 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:09,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 19 [2021-11-19 14:21:09,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22484193] [2021-11-19 14:21:09,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:09,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-19 14:21:09,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:09,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-19 14:21:09,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-11-19 14:21:09,297 INFO L87 Difference]: Start difference. First operand 97 states and 158 transitions. Second operand has 19 states, 19 states have (on average 4.842105263157895) internal successors, (92), 19 states have internal predecessors, (92), 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) [2021-11-19 14:21:09,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:09,666 INFO L93 Difference]: Finished difference Result 174 states and 302 transitions. [2021-11-19 14:21:09,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-19 14:21:09,667 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.842105263157895) internal successors, (92), 19 states have internal predecessors, (92), 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 121 [2021-11-19 14:21:09,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:09,668 INFO L225 Difference]: With dead ends: 174 [2021-11-19 14:21:09,669 INFO L226 Difference]: Without dead ends: 79 [2021-11-19 14:21:09,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=254, Invalid=676, Unknown=0, NotChecked=0, Total=930 [2021-11-19 14:21:09,672 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 189 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:09,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 74 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 14:21:09,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-19 14:21:09,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 71. [2021-11-19 14:21:09,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 54 states have internal predecessors, (61), 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) [2021-11-19 14:21:09,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 86 transitions. [2021-11-19 14:21:09,680 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 86 transitions. Word has length 121 [2021-11-19 14:21:09,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:09,681 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 86 transitions. [2021-11-19 14:21:09,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.842105263157895) internal successors, (92), 19 states have internal predecessors, (92), 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) [2021-11-19 14:21:09,681 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 86 transitions. [2021-11-19 14:21:09,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-19 14:21:09,682 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:09,683 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1] [2021-11-19 14:21:09,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:09,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:09,903 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:09,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:09,904 INFO L85 PathProgramCache]: Analyzing trace with hash 627507959, now seen corresponding path program 3 times [2021-11-19 14:21:09,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:09,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927966000] [2021-11-19 14:21:09,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:09,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:09,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:10,044 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 81 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-19 14:21:10,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:10,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927966000] [2021-11-19 14:21:10,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927966000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:10,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562817294] [2021-11-19 14:21:10,045 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 14:21:10,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:10,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:10,055 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:10,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 14:21:10,109 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 14:21:10,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:10,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 14:21:10,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:10,316 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 123 proven. 37 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-19 14:21:10,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:10,920 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 88 proven. 62 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-19 14:21:10,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562817294] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:10,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [35131204] [2021-11-19 14:21:10,923 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:10,923 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:10,924 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:610) 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) [2021-11-19 14:21:10,925 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:10,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2021-11-19 14:21:10,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655723850] [2021-11-19 14:21:10,926 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:10,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-19 14:21:10,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:10,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-19 14:21:10,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-19 14:21:10,928 INFO L87 Difference]: Start difference. First operand 71 states and 86 transitions. Second operand has 16 states, 16 states have (on average 4.875) internal successors, (78), 16 states have internal predecessors, (78), 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) [2021-11-19 14:21:11,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:11,138 INFO L93 Difference]: Finished difference Result 130 states and 160 transitions. [2021-11-19 14:21:11,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 14:21:11,139 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.875) internal successors, (78), 16 states have internal predecessors, (78), 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 83 [2021-11-19 14:21:11,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:11,140 INFO L225 Difference]: With dead ends: 130 [2021-11-19 14:21:11,140 INFO L226 Difference]: Without dead ends: 63 [2021-11-19 14:21:11,141 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 160 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2021-11-19 14:21:11,142 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 55 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:11,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 65 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:21:11,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-19 14:21:11,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-19 14:21:11,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 49 states have (on average 1.0816326530612246) 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) [2021-11-19 14:21:11,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-11-19 14:21:11,149 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 83 [2021-11-19 14:21:11,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:11,150 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-11-19 14:21:11,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.875) internal successors, (78), 16 states have internal predecessors, (78), 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) [2021-11-19 14:21:11,150 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-11-19 14:21:11,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-19 14:21:11,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:11,152 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1] [2021-11-19 14:21:11,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:11,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-19 14:21:11,369 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:11,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:11,370 INFO L85 PathProgramCache]: Analyzing trace with hash 648250205, now seen corresponding path program 3 times [2021-11-19 14:21:11,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:11,370 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909474469] [2021-11-19 14:21:11,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:11,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:11,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:11,517 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-19 14:21:11,517 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:11,518 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909474469] [2021-11-19 14:21:11,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [909474469] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:11,518 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808079479] [2021-11-19 14:21:11,518 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 14:21:11,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:11,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:11,519 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:11,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 14:21:11,595 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 14:21:11,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:11,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-19 14:21:11,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:11,826 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-19 14:21:11,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:12,096 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-19 14:21:12,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808079479] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:12,097 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1152086196] [2021-11-19 14:21:12,101 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:12,101 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:12,101 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:610) 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) [2021-11-19 14:21:12,102 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:12,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 18 [2021-11-19 14:21:12,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918549074] [2021-11-19 14:21:12,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:12,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-19 14:21:12,104 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:12,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-19 14:21:12,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-19 14:21:12,105 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 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) [2021-11-19 14:21:12,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:12,242 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2021-11-19 14:21:12,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 14:21:12,242 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 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 83 [2021-11-19 14:21:12,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:12,243 INFO L225 Difference]: With dead ends: 67 [2021-11-19 14:21:12,244 INFO L226 Difference]: Without dead ends: 66 [2021-11-19 14:21:12,244 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2021-11-19 14:21:12,245 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 29 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:12,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 178 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:21:12,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-19 14:21:12,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2021-11-19 14:21:12,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 47 states have internal predecessors, (52), 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) [2021-11-19 14:21:12,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2021-11-19 14:21:12,253 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 83 [2021-11-19 14:21:12,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:12,253 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2021-11-19 14:21:12,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 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) [2021-11-19 14:21:12,254 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2021-11-19 14:21:12,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2021-11-19 14:21:12,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:12,261 INFO L514 BasicCegarLoop]: trace histogram [25, 23, 20, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 10, 10, 8, 5, 1, 1, 1] [2021-11-19 14:21:12,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:12,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-19 14:21:12,478 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:12,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:12,478 INFO L85 PathProgramCache]: Analyzing trace with hash -538720458, now seen corresponding path program 4 times [2021-11-19 14:21:12,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:12,479 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993911530] [2021-11-19 14:21:12,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:12,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:12,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:12,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1913 backedges. 232 proven. 648 refuted. 0 times theorem prover too weak. 1033 trivial. 0 not checked. [2021-11-19 14:21:12,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:12,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993911530] [2021-11-19 14:21:12,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993911530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:12,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741010805] [2021-11-19 14:21:12,658 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 14:21:12,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:12,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:12,659 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:12,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 14:21:12,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:12,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 460 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 14:21:12,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:13,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1913 backedges. 893 proven. 533 refuted. 0 times theorem prover too weak. 487 trivial. 0 not checked. [2021-11-19 14:21:13,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:14,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1913 backedges. 273 proven. 850 refuted. 0 times theorem prover too weak. 790 trivial. 0 not checked. [2021-11-19 14:21:14,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741010805] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:14,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [974789350] [2021-11-19 14:21:14,458 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:14,458 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:14,459 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:610) 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) [2021-11-19 14:21:14,460 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:14,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 18] total 23 [2021-11-19 14:21:14,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711753695] [2021-11-19 14:21:14,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:14,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-19 14:21:14,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:14,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-19 14:21:14,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-11-19 14:21:14,463 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand has 23 states, 23 states have (on average 5.956521739130435) internal successors, (137), 23 states have internal predecessors, (137), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) [2021-11-19 14:21:14,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:14,904 INFO L93 Difference]: Finished difference Result 151 states and 183 transitions. [2021-11-19 14:21:14,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-19 14:21:14,905 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 5.956521739130435) internal successors, (137), 23 states have internal predecessors, (137), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) Word has length 234 [2021-11-19 14:21:14,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:14,906 INFO L225 Difference]: With dead ends: 151 [2021-11-19 14:21:14,906 INFO L226 Difference]: Without dead ends: 93 [2021-11-19 14:21:14,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 463 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=411, Invalid=1071, Unknown=0, NotChecked=0, Total=1482 [2021-11-19 14:21:14,908 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 194 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:14,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 64 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 14:21:14,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-19 14:21:14,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 80. [2021-11-19 14:21:14,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 64 states have (on average 1.078125) internal successors, (69), 61 states have internal predecessors, (69), 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) [2021-11-19 14:21:14,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 95 transitions. [2021-11-19 14:21:14,916 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 95 transitions. Word has length 234 [2021-11-19 14:21:14,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:14,916 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 95 transitions. [2021-11-19 14:21:14,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 5.956521739130435) internal successors, (137), 23 states have internal predecessors, (137), 18 states have call successors, (25), 3 states have call predecessors, (25), 9 states have return successors, (28), 11 states have call predecessors, (28), 17 states have call successors, (28) [2021-11-19 14:21:14,917 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 95 transitions. [2021-11-19 14:21:14,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-19 14:21:14,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:14,919 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 11, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1] [2021-11-19 14:21:14,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:15,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:15,134 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:15,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:15,135 INFO L85 PathProgramCache]: Analyzing trace with hash -1713916628, now seen corresponding path program 5 times [2021-11-19 14:21:15,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:15,135 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92021930] [2021-11-19 14:21:15,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:15,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:15,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:15,274 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 164 proven. 168 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-19 14:21:15,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:15,274 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92021930] [2021-11-19 14:21:15,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92021930] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:15,275 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340075286] [2021-11-19 14:21:15,275 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:21:15,275 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:15,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:15,276 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:15,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-19 14:21:15,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-19 14:21:15,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:15,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-19 14:21:15,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:15,810 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 61 proven. 90 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2021-11-19 14:21:15,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:16,928 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 103 proven. 90 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2021-11-19 14:21:16,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340075286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:16,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604416705] [2021-11-19 14:21:16,931 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:16,931 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:16,932 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:610) 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) [2021-11-19 14:21:16,933 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:16,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 15] total 35 [2021-11-19 14:21:16,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346485109] [2021-11-19 14:21:16,933 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:16,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-19 14:21:16,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:16,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-19 14:21:16,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1023, Unknown=0, NotChecked=0, Total=1190 [2021-11-19 14:21:16,936 INFO L87 Difference]: Start difference. First operand 80 states and 95 transitions. Second operand has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 35 states have internal predecessors, (118), 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) [2021-11-19 14:21:18,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:18,039 INFO L93 Difference]: Finished difference Result 188 states and 251 transitions. [2021-11-19 14:21:18,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-19 14:21:18,039 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 35 states have internal predecessors, (118), 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 127 [2021-11-19 14:21:18,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:18,041 INFO L225 Difference]: With dead ends: 188 [2021-11-19 14:21:18,041 INFO L226 Difference]: Without dead ends: 112 [2021-11-19 14:21:18,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 955 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=662, Invalid=3120, Unknown=0, NotChecked=0, Total=3782 [2021-11-19 14:21:18,045 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 247 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 939 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 1128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:18,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [247 Valid, 108 Invalid, 1128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 939 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 14:21:18,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-19 14:21:18,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 92. [2021-11-19 14:21:18,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 71 states have internal predecessors, (76), 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) [2021-11-19 14:21:18,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 112 transitions. [2021-11-19 14:21:18,055 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 112 transitions. Word has length 127 [2021-11-19 14:21:18,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:18,056 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 112 transitions. [2021-11-19 14:21:18,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3714285714285714) internal successors, (118), 35 states have internal predecessors, (118), 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) [2021-11-19 14:21:18,056 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 112 transitions. [2021-11-19 14:21:18,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 457 [2021-11-19 14:21:18,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:18,066 INFO L514 BasicCegarLoop]: trace histogram [48, 45, 39, 24, 24, 24, 24, 23, 23, 23, 23, 23, 22, 22, 21, 21, 15, 9, 1, 1, 1] [2021-11-19 14:21:18,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:18,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:18,279 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:18,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:18,280 INFO L85 PathProgramCache]: Analyzing trace with hash -592766942, now seen corresponding path program 6 times [2021-11-19 14:21:18,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:18,280 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566813170] [2021-11-19 14:21:18,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:18,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:18,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:18,579 INFO L134 CoverageAnalysis]: Checked inductivity of 7489 backedges. 533 proven. 1908 refuted. 0 times theorem prover too weak. 5048 trivial. 0 not checked. [2021-11-19 14:21:18,579 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:18,579 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566813170] [2021-11-19 14:21:18,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566813170] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:18,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937462118] [2021-11-19 14:21:18,580 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 14:21:18,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:18,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:18,585 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:18,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-19 14:21:18,731 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 14:21:18,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:18,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-19 14:21:18,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:19,607 INFO L134 CoverageAnalysis]: Checked inductivity of 7489 backedges. 3885 proven. 1274 refuted. 0 times theorem prover too weak. 2330 trivial. 0 not checked. [2021-11-19 14:21:19,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:21,580 INFO L134 CoverageAnalysis]: Checked inductivity of 7489 backedges. 614 proven. 2447 refuted. 0 times theorem prover too weak. 4428 trivial. 0 not checked. [2021-11-19 14:21:21,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937462118] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:21,581 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1146696201] [2021-11-19 14:21:21,584 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:21,584 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:21,585 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:610) 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) [2021-11-19 14:21:21,587 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:21,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 21] total 26 [2021-11-19 14:21:21,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853721810] [2021-11-19 14:21:21,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:21,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-19 14:21:21,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:21,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-19 14:21:21,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=541, Unknown=0, NotChecked=0, Total=650 [2021-11-19 14:21:21,592 INFO L87 Difference]: Start difference. First operand 92 states and 112 transitions. Second operand has 26 states, 26 states have (on average 5.923076923076923) internal successors, (154), 26 states have internal predecessors, (154), 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) [2021-11-19 14:21:22,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:22,154 INFO L93 Difference]: Finished difference Result 219 states and 288 transitions. [2021-11-19 14:21:22,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-19 14:21:22,155 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.923076923076923) internal successors, (154), 26 states have internal predecessors, (154), 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 456 [2021-11-19 14:21:22,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:22,163 INFO L225 Difference]: With dead ends: 219 [2021-11-19 14:21:22,164 INFO L226 Difference]: Without dead ends: 131 [2021-11-19 14:21:22,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 954 GetRequests, 908 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=568, Invalid=1502, Unknown=0, NotChecked=0, Total=2070 [2021-11-19 14:21:22,168 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 463 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 463 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:22,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [463 Valid, 88 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 14:21:22,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-19 14:21:22,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 118. [2021-11-19 14:21:22,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 95 states have (on average 1.0526315789473684) internal successors, (100), 91 states have internal predecessors, (100), 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) [2021-11-19 14:21:22,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 146 transitions. [2021-11-19 14:21:22,176 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 146 transitions. Word has length 456 [2021-11-19 14:21:22,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:22,177 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 146 transitions. [2021-11-19 14:21:22,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.923076923076923) internal successors, (154), 26 states have internal predecessors, (154), 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) [2021-11-19 14:21:22,177 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 146 transitions. [2021-11-19 14:21:22,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2021-11-19 14:21:22,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:22,183 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 25, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 10, 6, 1, 1, 1] [2021-11-19 14:21:22,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:22,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-19 14:21:22,409 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:22,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:22,410 INFO L85 PathProgramCache]: Analyzing trace with hash 773138640, now seen corresponding path program 7 times [2021-11-19 14:21:22,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:22,410 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040075374] [2021-11-19 14:21:22,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:22,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:22,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:22,587 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 509 proven. 990 refuted. 0 times theorem prover too weak. 1637 trivial. 0 not checked. [2021-11-19 14:21:22,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:22,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040075374] [2021-11-19 14:21:22,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040075374] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:22,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848477599] [2021-11-19 14:21:22,588 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 14:21:22,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:22,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:22,589 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:22,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-19 14:21:22,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:22,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 14:21:22,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:23,249 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1778 proven. 484 refuted. 0 times theorem prover too weak. 874 trivial. 0 not checked. [2021-11-19 14:21:23,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:24,992 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 504 proven. 1101 refuted. 0 times theorem prover too weak. 1531 trivial. 0 not checked. [2021-11-19 14:21:24,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848477599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:24,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1513454581] [2021-11-19 14:21:24,994 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:24,995 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:24,995 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:610) 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) [2021-11-19 14:21:24,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:24,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 19] total 24 [2021-11-19 14:21:24,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024050945] [2021-11-19 14:21:24,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:24,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-19 14:21:24,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:24,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-19 14:21:24,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-19 14:21:24,999 INFO L87 Difference]: Start difference. First operand 118 states and 146 transitions. Second operand has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-19 14:21:25,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:25,382 INFO L93 Difference]: Finished difference Result 230 states and 295 transitions. [2021-11-19 14:21:25,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-19 14:21:25,383 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) Word has length 298 [2021-11-19 14:21:25,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:25,384 INFO L225 Difference]: With dead ends: 230 [2021-11-19 14:21:25,384 INFO L226 Difference]: Without dead ends: 116 [2021-11-19 14:21:25,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 590 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=349, Invalid=911, Unknown=0, NotChecked=0, Total=1260 [2021-11-19 14:21:25,386 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 143 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:25,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 148 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 14:21:25,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-19 14:21:25,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 104. [2021-11-19 14:21:25,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 83 states have (on average 1.036144578313253) internal successors, (86), 81 states have internal predecessors, (86), 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) [2021-11-19 14:21:25,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 125 transitions. [2021-11-19 14:21:25,395 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 125 transitions. Word has length 298 [2021-11-19 14:21:25,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:25,396 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 125 transitions. [2021-11-19 14:21:25,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.541666666666667) internal successors, (133), 24 states have internal predecessors, (133), 18 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (28), 10 states have call predecessors, (28), 18 states have call successors, (28) [2021-11-19 14:21:25,396 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 125 transitions. [2021-11-19 14:21:25,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 495 [2021-11-19 14:21:25,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:25,401 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 41, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 24, 24, 16, 10, 1, 1, 1] [2021-11-19 14:21:25,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:25,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-19 14:21:25,617 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:25,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:25,618 INFO L85 PathProgramCache]: Analyzing trace with hash 406221792, now seen corresponding path program 8 times [2021-11-19 14:21:25,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:25,618 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132902278] [2021-11-19 14:21:25,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:25,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:25,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:25,921 INFO L134 CoverageAnalysis]: Checked inductivity of 8796 backedges. 1054 proven. 2452 refuted. 0 times theorem prover too weak. 5290 trivial. 0 not checked. [2021-11-19 14:21:25,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:25,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132902278] [2021-11-19 14:21:25,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132902278] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:25,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991855672] [2021-11-19 14:21:25,922 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:21:25,922 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:25,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:25,929 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:25,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-19 14:21:26,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-11-19 14:21:26,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:26,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 14:21:26,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:26,928 INFO L134 CoverageAnalysis]: Checked inductivity of 8796 backedges. 1713 proven. 1024 refuted. 0 times theorem prover too weak. 6059 trivial. 0 not checked. [2021-11-19 14:21:26,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:28,702 INFO L134 CoverageAnalysis]: Checked inductivity of 8796 backedges. 1721 proven. 1063 refuted. 0 times theorem prover too weak. 6012 trivial. 0 not checked. [2021-11-19 14:21:28,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991855672] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:28,702 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269946347] [2021-11-19 14:21:28,708 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:28,709 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:28,709 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:610) 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) [2021-11-19 14:21:28,710 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:28,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 19] total 27 [2021-11-19 14:21:28,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668218918] [2021-11-19 14:21:28,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:28,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-19 14:21:28,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:28,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-19 14:21:28,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=574, Unknown=0, NotChecked=0, Total=702 [2021-11-19 14:21:28,717 INFO L87 Difference]: Start difference. First operand 104 states and 125 transitions. Second operand has 27 states, 27 states have (on average 5.777777777777778) internal successors, (156), 27 states have internal predecessors, (156), 19 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (38), 19 states have call predecessors, (38), 19 states have call successors, (38) [2021-11-19 14:21:29,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:29,462 INFO L93 Difference]: Finished difference Result 258 states and 336 transitions. [2021-11-19 14:21:29,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-19 14:21:29,463 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 5.777777777777778) internal successors, (156), 27 states have internal predecessors, (156), 19 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (38), 19 states have call predecessors, (38), 19 states have call successors, (38) Word has length 494 [2021-11-19 14:21:29,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:29,466 INFO L225 Difference]: With dead ends: 258 [2021-11-19 14:21:29,466 INFO L226 Difference]: Without dead ends: 158 [2021-11-19 14:21:29,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1040 GetRequests, 987 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=682, Invalid=2074, Unknown=0, NotChecked=0, Total=2756 [2021-11-19 14:21:29,488 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 398 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 398 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:29,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [398 Valid, 118 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 14:21:29,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-19 14:21:29,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 134. [2021-11-19 14:21:29,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 105 states have internal predecessors, (113), 17 states have call successors, (17), 14 states have call predecessors, (17), 8 states have return successors, (38), 14 states have call predecessors, (38), 16 states have call successors, (38) [2021-11-19 14:21:29,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 168 transitions. [2021-11-19 14:21:29,502 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 168 transitions. Word has length 494 [2021-11-19 14:21:29,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:29,505 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 168 transitions. [2021-11-19 14:21:29,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 5.777777777777778) internal successors, (156), 27 states have internal predecessors, (156), 19 states have call successors, (28), 1 states have call predecessors, (28), 12 states have return successors, (38), 19 states have call predecessors, (38), 19 states have call successors, (38) [2021-11-19 14:21:29,505 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 168 transitions. [2021-11-19 14:21:29,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2021-11-19 14:21:29,509 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:29,510 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 28, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 16, 16, 11, 7, 1, 1, 1] [2021-11-19 14:21:29,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:29,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-19 14:21:29,733 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:29,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:29,734 INFO L85 PathProgramCache]: Analyzing trace with hash 58791316, now seen corresponding path program 9 times [2021-11-19 14:21:29,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:29,734 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952534180] [2021-11-19 14:21:29,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:29,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:29,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:29,948 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 727 proven. 1095 refuted. 0 times theorem prover too weak. 2212 trivial. 0 not checked. [2021-11-19 14:21:29,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:29,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952534180] [2021-11-19 14:21:29,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952534180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:29,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217826374] [2021-11-19 14:21:29,949 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 14:21:29,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:29,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:29,949 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:29,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-19 14:21:30,057 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 14:21:30,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:30,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-19 14:21:30,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:30,606 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 840 proven. 1214 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2021-11-19 14:21:30,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:32,412 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 840 proven. 1290 refuted. 0 times theorem prover too weak. 1904 trivial. 0 not checked. [2021-11-19 14:21:32,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217826374] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:32,413 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [729436559] [2021-11-19 14:21:32,415 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:32,415 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:32,416 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:610) 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) [2021-11-19 14:21:32,418 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:32,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2021-11-19 14:21:32,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944900483] [2021-11-19 14:21:32,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:32,421 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-19 14:21:32,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:32,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-19 14:21:32,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-11-19 14:21:32,423 INFO L87 Difference]: Start difference. First operand 134 states and 168 transitions. Second operand has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-19 14:21:32,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:32,926 INFO L93 Difference]: Finished difference Result 277 states and 362 transitions. [2021-11-19 14:21:32,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-19 14:21:32,927 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) Word has length 337 [2021-11-19 14:21:32,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:32,930 INFO L225 Difference]: With dead ends: 277 [2021-11-19 14:21:32,930 INFO L226 Difference]: Without dead ends: 147 [2021-11-19 14:21:32,932 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 709 GetRequests, 666 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2021-11-19 14:21:32,933 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 271 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:32,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 167 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 494 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 14:21:32,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-19 14:21:32,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 123. [2021-11-19 14:21:32,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 98 states have (on average 1.030612244897959) internal successors, (101), 97 states have internal predecessors, (101), 16 states have call successors, (16), 12 states have call predecessors, (16), 8 states have return successors, (35), 13 states have call predecessors, (35), 15 states have call successors, (35) [2021-11-19 14:21:32,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 152 transitions. [2021-11-19 14:21:32,943 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 152 transitions. Word has length 337 [2021-11-19 14:21:32,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:32,944 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 152 transitions. [2021-11-19 14:21:32,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.25) internal successors, (147), 28 states have internal predecessors, (147), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2021-11-19 14:21:32,945 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 152 transitions. [2021-11-19 14:21:32,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 403 [2021-11-19 14:21:32,948 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:32,948 INFO L514 BasicCegarLoop]: trace histogram [42, 40, 34, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 19, 19, 13, 8, 1, 1, 1] [2021-11-19 14:21:32,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:33,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-19 14:21:33,173 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:33,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:33,174 INFO L85 PathProgramCache]: Analyzing trace with hash -515709298, now seen corresponding path program 10 times [2021-11-19 14:21:33,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:33,174 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353226618] [2021-11-19 14:21:33,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:33,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:33,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:33,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 830 proven. 1451 refuted. 0 times theorem prover too weak. 3503 trivial. 0 not checked. [2021-11-19 14:21:33,608 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:33,609 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353226618] [2021-11-19 14:21:33,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353226618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:33,609 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583623185] [2021-11-19 14:21:33,609 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 14:21:33,609 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:33,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:33,610 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:33,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-19 14:21:33,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:33,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-19 14:21:33,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:34,756 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 820 proven. 1093 refuted. 0 times theorem prover too weak. 3871 trivial. 0 not checked. [2021-11-19 14:21:34,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:40,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5784 backedges. 1149 proven. 996 refuted. 0 times theorem prover too weak. 3639 trivial. 0 not checked. [2021-11-19 14:21:40,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [583623185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:40,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [660500724] [2021-11-19 14:21:40,133 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:40,133 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:40,135 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:610) 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) [2021-11-19 14:21:40,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:40,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2021-11-19 14:21:40,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119842] [2021-11-19 14:21:40,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:40,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-19 14:21:40,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:40,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-19 14:21:40,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2021-11-19 14:21:40,141 INFO L87 Difference]: Start difference. First operand 123 states and 152 transitions. Second operand has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) [2021-11-19 14:21:40,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:40,347 INFO L93 Difference]: Finished difference Result 154 states and 204 transitions. [2021-11-19 14:21:40,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-19 14:21:40,348 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) Word has length 402 [2021-11-19 14:21:40,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:40,350 INFO L225 Difference]: With dead ends: 154 [2021-11-19 14:21:40,350 INFO L226 Difference]: Without dead ends: 153 [2021-11-19 14:21:40,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 887 GetRequests, 839 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1002 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2021-11-19 14:21:40,352 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 51 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:40,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 202 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:21:40,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-19 14:21:40,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 143. [2021-11-19 14:21:40,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 112 states have internal predecessors, (117), 18 states have call successors, (18), 12 states have call predecessors, (18), 10 states have return successors, (55), 18 states have call predecessors, (55), 17 states have call successors, (55) [2021-11-19 14:21:40,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 190 transitions. [2021-11-19 14:21:40,364 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 190 transitions. Word has length 402 [2021-11-19 14:21:40,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:40,365 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 190 transitions. [2021-11-19 14:21:40,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.533333333333333) internal successors, (114), 46 states have internal predecessors, (114), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) [2021-11-19 14:21:40,366 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 190 transitions. [2021-11-19 14:21:40,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 815 [2021-11-19 14:21:40,373 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:40,373 INFO L514 BasicCegarLoop]: trace histogram [84, 82, 68, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 40, 40, 26, 16, 1, 1, 1] [2021-11-19 14:21:40,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:40,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:40,592 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:40,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:40,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1036405165, now seen corresponding path program 11 times [2021-11-19 14:21:40,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:40,593 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024692392] [2021-11-19 14:21:40,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:40,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:40,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:41,022 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 2275 proven. 5134 refuted. 0 times theorem prover too weak. 16766 trivial. 0 not checked. [2021-11-19 14:21:41,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:41,022 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024692392] [2021-11-19 14:21:41,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024692392] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:41,023 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274269643] [2021-11-19 14:21:41,023 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:21:41,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:41,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:41,029 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:41,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-19 14:21:41,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2021-11-19 14:21:41,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:41,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 1154 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-19 14:21:41,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:42,651 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 3298 proven. 2096 refuted. 0 times theorem prover too weak. 18781 trivial. 0 not checked. [2021-11-19 14:21:42,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:45,530 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 3314 proven. 2152 refuted. 0 times theorem prover too weak. 18709 trivial. 0 not checked. [2021-11-19 14:21:45,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274269643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:45,531 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [999873332] [2021-11-19 14:21:45,532 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:45,533 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:45,533 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:610) 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) [2021-11-19 14:21:45,535 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:45,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 14, 21] total 31 [2021-11-19 14:21:45,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366445463] [2021-11-19 14:21:45,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:45,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-19 14:21:45,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:45,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-19 14:21:45,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=768, Unknown=0, NotChecked=0, Total=930 [2021-11-19 14:21:45,541 INFO L87 Difference]: Start difference. First operand 143 states and 190 transitions. Second operand has 31 states, 31 states have (on average 5.774193548387097) internal successors, (179), 31 states have internal predecessors, (179), 21 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (44), 23 states have call predecessors, (44), 21 states have call successors, (44) [2021-11-19 14:21:46,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:46,516 INFO L93 Difference]: Finished difference Result 333 states and 485 transitions. [2021-11-19 14:21:46,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-19 14:21:46,517 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 5.774193548387097) internal successors, (179), 31 states have internal predecessors, (179), 21 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (44), 23 states have call predecessors, (44), 21 states have call successors, (44) Word has length 814 [2021-11-19 14:21:46,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:46,521 INFO L225 Difference]: With dead ends: 333 [2021-11-19 14:21:46,521 INFO L226 Difference]: Without dead ends: 194 [2021-11-19 14:21:46,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1689 GetRequests, 1627 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=896, Invalid=2886, Unknown=0, NotChecked=0, Total=3782 [2021-11-19 14:21:46,529 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 573 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 619 mSolverCounterSat, 461 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 573 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 1080 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 461 IncrementalHoareTripleChecker+Valid, 619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:46,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [573 Valid, 179 Invalid, 1080 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [461 Valid, 619 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:21:46,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-19 14:21:46,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 181. [2021-11-19 14:21:46,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 146 states have (on average 1.0342465753424657) internal successors, (151), 142 states have internal predecessors, (151), 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) [2021-11-19 14:21:46,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 238 transitions. [2021-11-19 14:21:46,555 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 238 transitions. Word has length 814 [2021-11-19 14:21:46,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:46,557 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 238 transitions. [2021-11-19 14:21:46,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 5.774193548387097) internal successors, (179), 31 states have internal predecessors, (179), 21 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (44), 23 states have call predecessors, (44), 21 states have call successors, (44) [2021-11-19 14:21:46,558 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 238 transitions. [2021-11-19 14:21:46,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 815 [2021-11-19 14:21:46,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:46,565 INFO L514 BasicCegarLoop]: trace histogram [84, 82, 68, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 40, 40, 26, 16, 1, 1, 1] [2021-11-19 14:21:46,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:46,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:46,781 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:46,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:46,782 INFO L85 PathProgramCache]: Analyzing trace with hash -497078231, now seen corresponding path program 12 times [2021-11-19 14:21:46,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:46,782 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058643041] [2021-11-19 14:21:46,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:46,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:46,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:47,178 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 2270 proven. 4945 refuted. 0 times theorem prover too weak. 16960 trivial. 0 not checked. [2021-11-19 14:21:47,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:47,178 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058643041] [2021-11-19 14:21:47,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058643041] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:47,178 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446771559] [2021-11-19 14:21:47,178 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 14:21:47,179 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:47,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:47,180 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:47,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-19 14:21:47,519 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 14:21:47,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:21:47,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 1014 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-19 14:21:47,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:48,823 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 12343 proven. 2667 refuted. 0 times theorem prover too weak. 9165 trivial. 0 not checked. [2021-11-19 14:21:48,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:21:52,608 INFO L134 CoverageAnalysis]: Checked inductivity of 24175 backedges. 2261 proven. 5308 refuted. 0 times theorem prover too weak. 16606 trivial. 0 not checked. [2021-11-19 14:21:52,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446771559] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:21:52,609 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1151582847] [2021-11-19 14:21:52,610 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:21:52,611 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:21:52,611 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:610) 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) [2021-11-19 14:21:52,619 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:21:52,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 27] total 32 [2021-11-19 14:21:52,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117960917] [2021-11-19 14:21:52,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:21:52,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-19 14:21:52,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:21:52,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-19 14:21:52,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2021-11-19 14:21:52,622 INFO L87 Difference]: Start difference. First operand 181 states and 238 transitions. Second operand has 32 states, 32 states have (on average 5.65625) internal successors, (181), 32 states have internal predecessors, (181), 26 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (40), 14 states have call predecessors, (40), 26 states have call successors, (40) [2021-11-19 14:21:53,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:21:53,249 INFO L93 Difference]: Finished difference Result 359 states and 488 transitions. [2021-11-19 14:21:53,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-19 14:21:53,250 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.65625) internal successors, (181), 32 states have internal predecessors, (181), 26 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (40), 14 states have call predecessors, (40), 26 states have call successors, (40) Word has length 814 [2021-11-19 14:21:53,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:21:53,253 INFO L225 Difference]: With dead ends: 359 [2021-11-19 14:21:53,253 INFO L226 Difference]: Without dead ends: 182 [2021-11-19 14:21:53,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1672 GetRequests, 1622 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=632, Invalid=1818, Unknown=0, NotChecked=0, Total=2450 [2021-11-19 14:21:53,257 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 439 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 589 mSolverCounterSat, 357 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 357 IncrementalHoareTripleChecker+Valid, 589 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 14:21:53,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [439 Valid, 191 Invalid, 946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [357 Valid, 589 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 14:21:53,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-19 14:21:53,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 146. [2021-11-19 14:21:53,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 115 states have internal predecessors, (120), 19 states have call successors, (19), 14 states have call predecessors, (19), 9 states have return successors, (45), 16 states have call predecessors, (45), 18 states have call successors, (45) [2021-11-19 14:21:53,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 184 transitions. [2021-11-19 14:21:53,269 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 184 transitions. Word has length 814 [2021-11-19 14:21:53,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:21:53,270 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 184 transitions. [2021-11-19 14:21:53,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.65625) internal successors, (181), 32 states have internal predecessors, (181), 26 states have call successors, (31), 2 states have call predecessors, (31), 14 states have return successors, (40), 14 states have call predecessors, (40), 26 states have call successors, (40) [2021-11-19 14:21:53,270 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 184 transitions. [2021-11-19 14:21:53,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1593 [2021-11-19 14:21:53,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:21:53,292 INFO L514 BasicCegarLoop]: trace histogram [165, 159, 134, 84, 84, 84, 84, 80, 80, 80, 80, 80, 79, 79, 78, 78, 50, 31, 1, 1, 1] [2021-11-19 14:21:53,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-19 14:21:53,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-19 14:21:53,517 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:21:53,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:21:53,518 INFO L85 PathProgramCache]: Analyzing trace with hash 2047839692, now seen corresponding path program 13 times [2021-11-19 14:21:53,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:21:53,518 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361853323] [2021-11-19 14:21:53,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:21:53,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:21:53,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:54,293 INFO L134 CoverageAnalysis]: Checked inductivity of 93356 backedges. 3965 proven. 11998 refuted. 0 times theorem prover too weak. 77393 trivial. 0 not checked. [2021-11-19 14:21:54,293 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:21:54,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361853323] [2021-11-19 14:21:54,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1361853323] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:21:54,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2091581006] [2021-11-19 14:21:54,294 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 14:21:54,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:21:54,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:21:54,297 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:21:54,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-19 14:21:54,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:21:54,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 2964 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-19 14:21:54,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:21:57,209 INFO L134 CoverageAnalysis]: Checked inductivity of 93356 backedges. 28975 proven. 10618 refuted. 0 times theorem prover too weak. 53763 trivial. 0 not checked. [2021-11-19 14:21:57,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:22:02,434 INFO L134 CoverageAnalysis]: Checked inductivity of 93356 backedges. 4835 proven. 13735 refuted. 0 times theorem prover too weak. 74786 trivial. 0 not checked. [2021-11-19 14:22:02,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2091581006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:22:02,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [907990804] [2021-11-19 14:22:02,437 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:22:02,437 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:22:02,437 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:610) 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) [2021-11-19 14:22:02,438 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:22:02,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 31] total 36 [2021-11-19 14:22:02,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673627503] [2021-11-19 14:22:02,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:22:02,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-19 14:22:02,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:22:02,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-19 14:22:02,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1071, Unknown=0, NotChecked=0, Total=1260 [2021-11-19 14:22:02,445 INFO L87 Difference]: Start difference. First operand 146 states and 184 transitions. Second operand has 36 states, 36 states have (on average 5.888888888888889) internal successors, (212), 36 states have internal predecessors, (212), 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) [2021-11-19 14:22:03,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:22:03,502 INFO L93 Difference]: Finished difference Result 355 states and 489 transitions. [2021-11-19 14:22:03,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-19 14:22:03,506 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.888888888888889) internal successors, (212), 36 states have internal predecessors, (212), 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 1592 [2021-11-19 14:22:03,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:22:03,510 INFO L225 Difference]: With dead ends: 355 [2021-11-19 14:22:03,510 INFO L226 Difference]: Without dead ends: 213 [2021-11-19 14:22:03,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3254 GetRequests, 3182 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1145 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1309, Invalid=3803, Unknown=0, NotChecked=0, Total=5112 [2021-11-19 14:22:03,516 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 1135 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 536 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1135 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 536 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 14:22:03,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1135 Valid, 130 Invalid, 928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [536 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 14:22:03,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-19 14:22:03,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 188. [2021-11-19 14:22:03,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 152 states have (on average 1.0328947368421053) internal successors, (157), 149 states have internal predecessors, (157), 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) [2021-11-19 14:22:03,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 245 transitions. [2021-11-19 14:22:03,536 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 245 transitions. Word has length 1592 [2021-11-19 14:22:03,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:22:03,538 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 245 transitions. [2021-11-19 14:22:03,538 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.888888888888889) internal successors, (212), 36 states have internal predecessors, (212), 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) [2021-11-19 14:22:03,538 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 245 transitions. [2021-11-19 14:22:03,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 913 [2021-11-19 14:22:03,547 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:22:03,547 INFO L514 BasicCegarLoop]: trace histogram [94, 92, 76, 47, 47, 47, 47, 46, 46, 46, 46, 46, 46, 46, 45, 45, 29, 18, 1, 1, 1] [2021-11-19 14:22:03,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-19 14:22:03,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-19 14:22:03,763 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:22:03,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:22:03,764 INFO L85 PathProgramCache]: Analyzing trace with hash 705096660, now seen corresponding path program 14 times [2021-11-19 14:22:03,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:22:03,764 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720213050] [2021-11-19 14:22:03,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:22:03,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:22:03,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:22:04,272 INFO L134 CoverageAnalysis]: Checked inductivity of 30407 backedges. 3361 proven. 5088 refuted. 0 times theorem prover too weak. 21958 trivial. 0 not checked. [2021-11-19 14:22:04,273 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:22:04,273 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720213050] [2021-11-19 14:22:04,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720213050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:22:04,273 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997606201] [2021-11-19 14:22:04,273 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:22:04,274 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:22:04,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:22:04,275 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:22:04,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-19 14:22:04,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-11-19 14:22:04,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:22:04,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 1037 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-19 14:22:04,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:22:06,073 INFO L134 CoverageAnalysis]: Checked inductivity of 30407 backedges. 4571 proven. 1474 refuted. 0 times theorem prover too weak. 24362 trivial. 0 not checked. [2021-11-19 14:22:06,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:22:08,955 INFO L134 CoverageAnalysis]: Checked inductivity of 30407 backedges. 4571 proven. 1550 refuted. 0 times theorem prover too weak. 24286 trivial. 0 not checked. [2021-11-19 14:22:08,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997606201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:22:08,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [403520040] [2021-11-19 14:22:08,958 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:22:08,958 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:22:08,958 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:610) 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) [2021-11-19 14:22:08,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:22:08,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 14, 21] total 32 [2021-11-19 14:22:08,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537943333] [2021-11-19 14:22:08,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:22:08,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-19 14:22:08,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:22:08,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-19 14:22:08,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2021-11-19 14:22:08,967 INFO L87 Difference]: Start difference. First operand 188 states and 245 transitions. Second operand has 32 states, 32 states have (on average 5.8125) internal successors, (186), 32 states have internal predecessors, (186), 22 states have call successors, (33), 1 states have call predecessors, (33), 16 states have return successors, (48), 24 states have call predecessors, (48), 22 states have call successors, (48) [2021-11-19 14:22:09,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:22:09,783 INFO L93 Difference]: Finished difference Result 397 states and 536 transitions. [2021-11-19 14:22:09,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-19 14:22:09,786 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.8125) internal successors, (186), 32 states have internal predecessors, (186), 22 states have call successors, (33), 1 states have call predecessors, (33), 16 states have return successors, (48), 24 states have call predecessors, (48), 22 states have call successors, (48) Word has length 912 [2021-11-19 14:22:09,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:22:09,789 INFO L225 Difference]: With dead ends: 397 [2021-11-19 14:22:09,789 INFO L226 Difference]: Without dead ends: 213 [2021-11-19 14:22:09,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1873 GetRequests, 1819 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 688 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=676, Invalid=2080, Unknown=0, NotChecked=0, Total=2756 [2021-11-19 14:22:09,792 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 320 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 252 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 971 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 252 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:22:09,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [320 Valid, 245 Invalid, 971 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [252 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:22:09,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-19 14:22:09,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 165. [2021-11-19 14:22:09,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 131 states have internal predecessors, (135), 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) [2021-11-19 14:22:09,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 213 transitions. [2021-11-19 14:22:09,807 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 213 transitions. Word has length 912 [2021-11-19 14:22:09,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:22:09,808 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 213 transitions. [2021-11-19 14:22:09,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.8125) internal successors, (186), 32 states have internal predecessors, (186), 22 states have call successors, (33), 1 states have call predecessors, (33), 16 states have return successors, (48), 24 states have call predecessors, (48), 22 states have call successors, (48) [2021-11-19 14:22:09,809 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 213 transitions. [2021-11-19 14:22:09,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1070 [2021-11-19 14:22:09,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:22:09,820 INFO L514 BasicCegarLoop]: trace histogram [110, 108, 89, 55, 55, 55, 55, 54, 54, 54, 54, 54, 54, 54, 53, 53, 34, 21, 1, 1, 1] [2021-11-19 14:22:09,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-19 14:22:10,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:22:10,042 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:22:10,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:22:10,042 INFO L85 PathProgramCache]: Analyzing trace with hash 1633234286, now seen corresponding path program 15 times [2021-11-19 14:22:10,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:22:10,043 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790985910] [2021-11-19 14:22:10,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:22:10,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:22:10,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:22:11,284 INFO L134 CoverageAnalysis]: Checked inductivity of 41881 backedges. 6794 proven. 10214 refuted. 0 times theorem prover too weak. 24873 trivial. 0 not checked. [2021-11-19 14:22:11,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:22:11,284 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790985910] [2021-11-19 14:22:11,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790985910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:22:11,285 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920783408] [2021-11-19 14:22:11,285 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 14:22:11,285 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:22:11,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:22:11,289 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:22:11,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-19 14:22:11,774 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 14:22:11,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:22:11,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 2001 conjuncts, 217 conjunts are in the unsatisfiable core [2021-11-19 14:22:11,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:22:14,174 INFO L134 CoverageAnalysis]: Checked inductivity of 41881 backedges. 6686 proven. 7802 refuted. 0 times theorem prover too weak. 27393 trivial. 0 not checked. [2021-11-19 14:22:14,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:22:40,992 INFO L134 CoverageAnalysis]: Checked inductivity of 41881 backedges. 7863 proven. 7339 refuted. 0 times theorem prover too weak. 26679 trivial. 0 not checked. [2021-11-19 14:22:40,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920783408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:22:40,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [883616322] [2021-11-19 14:22:40,995 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:22:40,995 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:22:40,996 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:610) 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) [2021-11-19 14:22:40,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:22:40,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 41] total 59 [2021-11-19 14:22:40,998 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637096806] [2021-11-19 14:22:40,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:22:40,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-19 14:22:40,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:22:41,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-19 14:22:41,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=770, Invalid=2770, Unknown=0, NotChecked=0, Total=3540 [2021-11-19 14:22:41,001 INFO L87 Difference]: Start difference. First operand 165 states and 213 transitions. Second operand has 60 states, 59 states have (on average 2.5084745762711864) internal successors, (148), 60 states have internal predecessors, (148), 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) [2021-11-19 14:22:41,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:22:41,338 INFO L93 Difference]: Finished difference Result 196 states and 269 transitions. [2021-11-19 14:22:41,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-19 14:22:41,339 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 2.5084745762711864) internal successors, (148), 60 states have internal predecessors, (148), 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 1069 [2021-11-19 14:22:41,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:22:41,345 INFO L225 Difference]: With dead ends: 196 [2021-11-19 14:22:41,345 INFO L226 Difference]: Without dead ends: 195 [2021-11-19 14:22:41,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2357 GetRequests, 2295 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1749 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=871, Invalid=3161, Unknown=0, NotChecked=0, Total=4032 [2021-11-19 14:22:41,354 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 85 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 14:22:41,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 293 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 14:22:41,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-19 14:22:41,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 185. [2021-11-19 14:22:41,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 148 states have (on average 1.0202702702702702) internal successors, (151), 146 states have internal predecessors, (151), 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) [2021-11-19 14:22:41,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 255 transitions. [2021-11-19 14:22:41,375 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 255 transitions. Word has length 1069 [2021-11-19 14:22:41,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:22:41,376 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 255 transitions. [2021-11-19 14:22:41,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 2.5084745762711864) internal successors, (148), 60 states have internal predecessors, (148), 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) [2021-11-19 14:22:41,377 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 255 transitions. [2021-11-19 14:22:41,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3229 [2021-11-19 14:22:41,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:22:41,464 INFO L514 BasicCegarLoop]: trace histogram [331, 327, 268, 166, 166, 166, 166, 164, 164, 164, 164, 164, 163, 163, 162, 162, 102, 63, 1, 1, 1] [2021-11-19 14:22:41,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-19 14:22:41,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-19 14:22:41,665 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:22:41,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:22:41,666 INFO L85 PathProgramCache]: Analyzing trace with hash 2031022988, now seen corresponding path program 16 times [2021-11-19 14:22:41,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:22:41,666 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195193324] [2021-11-19 14:22:41,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:22:41,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:22:42,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:22:43,635 INFO L134 CoverageAnalysis]: Checked inductivity of 385606 backedges. 8371 proven. 33199 refuted. 0 times theorem prover too weak. 344036 trivial. 0 not checked. [2021-11-19 14:22:43,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:22:43,635 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195193324] [2021-11-19 14:22:43,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195193324] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:22:43,635 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139275906] [2021-11-19 14:22:43,636 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 14:22:43,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:22:43,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:22:43,637 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:22:43,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-19 14:22:44,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:22:44,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 5988 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-19 14:22:44,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:22:49,599 INFO L134 CoverageAnalysis]: Checked inductivity of 385606 backedges. 180863 proven. 20720 refuted. 0 times theorem prover too weak. 184023 trivial. 0 not checked. [2021-11-19 14:22:49,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:22:59,704 INFO L134 CoverageAnalysis]: Checked inductivity of 385606 backedges. 10027 proven. 37065 refuted. 0 times theorem prover too weak. 338514 trivial. 0 not checked. [2021-11-19 14:22:59,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139275906] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:22:59,704 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1699154781] [2021-11-19 14:22:59,707 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:22:59,707 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:22:59,708 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:610) 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) [2021-11-19 14:22:59,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:22:59,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 37] total 42 [2021-11-19 14:22:59,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373385382] [2021-11-19 14:22:59,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:22:59,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-19 14:22:59,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:22:59,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-19 14:22:59,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1465, Unknown=0, NotChecked=0, Total=1722 [2021-11-19 14:22:59,717 INFO L87 Difference]: Start difference. First operand 185 states and 255 transitions. Second operand has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) [2021-11-19 14:23:01,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:23:01,161 INFO L93 Difference]: Finished difference Result 471 states and 704 transitions. [2021-11-19 14:23:01,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-19 14:23:01,170 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) Word has length 3228 [2021-11-19 14:23:01,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:23:01,175 INFO L225 Difference]: With dead ends: 471 [2021-11-19 14:23:01,175 INFO L226 Difference]: Without dead ends: 290 [2021-11-19 14:23:01,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6547 GetRequests, 6452 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2152 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2082, Invalid=6848, Unknown=0, NotChecked=0, Total=8930 [2021-11-19 14:23:01,184 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 1093 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 682 mSolverCounterSat, 705 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1093 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 1387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 705 IncrementalHoareTripleChecker+Valid, 682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 14:23:01,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1093 Valid, 197 Invalid, 1387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [705 Valid, 682 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 14:23:01,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-11-19 14:23:01,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 235. [2021-11-19 14:23:01,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 190 states have (on average 1.0263157894736843) internal successors, (195), 186 states have internal predecessors, (195), 31 states have call successors, (31), 23 states have call predecessors, (31), 13 states have return successors, (95), 25 states have call predecessors, (95), 30 states have call successors, (95) [2021-11-19 14:23:01,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 321 transitions. [2021-11-19 14:23:01,205 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 321 transitions. Word has length 3228 [2021-11-19 14:23:01,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:23:01,207 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 321 transitions. [2021-11-19 14:23:01,207 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.9523809523809526) internal successors, (250), 42 states have internal predecessors, (250), 37 states have call successors, (44), 4 states have call predecessors, (44), 18 states have return successors, (55), 20 states have call predecessors, (55), 35 states have call successors, (55) [2021-11-19 14:23:01,207 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 321 transitions. [2021-11-19 14:23:01,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2143 [2021-11-19 14:23:01,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:23:01,298 INFO L514 BasicCegarLoop]: trace histogram [219, 218, 177, 109, 109, 109, 109, 109, 109, 109, 109, 109, 109, 109, 108, 108, 68, 42, 1, 1, 1] [2021-11-19 14:23:01,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-19 14:23:01,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:23:01,521 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:23:01,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:23:01,523 INFO L85 PathProgramCache]: Analyzing trace with hash 1447782800, now seen corresponding path program 17 times [2021-11-19 14:23:01,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:23:01,523 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928333126] [2021-11-19 14:23:01,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:23:01,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:23:01,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:23:02,584 INFO L134 CoverageAnalysis]: Checked inductivity of 169376 backedges. 8282 proven. 19339 refuted. 0 times theorem prover too weak. 141755 trivial. 0 not checked. [2021-11-19 14:23:02,584 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:23:02,585 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928333126] [2021-11-19 14:23:02,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928333126] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:23:02,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109226833] [2021-11-19 14:23:02,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:23:02,587 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:23:02,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:23:02,588 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:23:02,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-19 14:23:03,618 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2021-11-19 14:23:03,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:23:03,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 1474 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-19 14:23:03,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:23:06,783 INFO L134 CoverageAnalysis]: Checked inductivity of 169376 backedges. 9700 proven. 14976 refuted. 0 times theorem prover too weak. 144700 trivial. 0 not checked. [2021-11-19 14:23:06,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:23:14,976 INFO L134 CoverageAnalysis]: Checked inductivity of 169376 backedges. 9692 proven. 15190 refuted. 0 times theorem prover too weak. 144494 trivial. 0 not checked. [2021-11-19 14:23:14,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109226833] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:23:14,977 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1763416954] [2021-11-19 14:23:14,979 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:23:14,979 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:23:14,979 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:610) 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) [2021-11-19 14:23:14,979 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:23:14,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20, 32] total 43 [2021-11-19 14:23:14,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095704879] [2021-11-19 14:23:14,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:23:14,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-19 14:23:14,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:23:14,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-19 14:23:14,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1494, Unknown=0, NotChecked=0, Total=1806 [2021-11-19 14:23:14,986 INFO L87 Difference]: Start difference. First operand 235 states and 321 transitions. Second operand has 43 states, 43 states have (on average 5.674418604651163) internal successors, (244), 43 states have internal predecessors, (244), 34 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 34 states have call successors, (61) [2021-11-19 14:23:16,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:23:16,059 INFO L93 Difference]: Finished difference Result 494 states and 710 transitions. [2021-11-19 14:23:16,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-19 14:23:16,060 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 5.674418604651163) internal successors, (244), 43 states have internal predecessors, (244), 34 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 34 states have call successors, (61) Word has length 2142 [2021-11-19 14:23:16,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:23:16,064 INFO L225 Difference]: With dead ends: 494 [2021-11-19 14:23:16,065 INFO L226 Difference]: Without dead ends: 263 [2021-11-19 14:23:16,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4345 GetRequests, 4263 SyntacticMatches, 14 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1145, Invalid=3685, Unknown=0, NotChecked=0, Total=4830 [2021-11-19 14:23:16,068 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 445 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 387 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 445 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 1682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 387 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 14:23:16,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [445 Valid, 369 Invalid, 1682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [387 Valid, 1295 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 14:23:16,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-11-19 14:23:16,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 194. [2021-11-19 14:23:16,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 154 states have internal predecessors, (159), 26 states have call successors, (26), 19 states have call predecessors, (26), 11 states have return successors, (70), 20 states have call predecessors, (70), 25 states have call successors, (70) [2021-11-19 14:23:16,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 255 transitions. [2021-11-19 14:23:16,086 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 255 transitions. Word has length 2142 [2021-11-19 14:23:16,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:23:16,088 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 255 transitions. [2021-11-19 14:23:16,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 5.674418604651163) internal successors, (244), 43 states have internal predecessors, (244), 34 states have call successors, (43), 1 states have call predecessors, (43), 20 states have return successors, (61), 26 states have call predecessors, (61), 34 states have call successors, (61) [2021-11-19 14:23:16,088 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 255 transitions. [2021-11-19 14:23:16,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4557 [2021-11-19 14:23:16,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:23:16,205 INFO L514 BasicCegarLoop]: trace histogram [466, 463, 377, 233, 233, 233, 233, 232, 232, 232, 232, 232, 231, 231, 230, 230, 144, 89, 1, 1, 1] [2021-11-19 14:23:16,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-19 14:23:16,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-19 14:23:16,417 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:23:16,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:23:16,418 INFO L85 PathProgramCache]: Analyzing trace with hash 571576471, now seen corresponding path program 18 times [2021-11-19 14:23:16,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:23:16,419 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711189882] [2021-11-19 14:23:16,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:23:16,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:23:17,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:23:19,653 INFO L134 CoverageAnalysis]: Checked inductivity of 769205 backedges. 15346 proven. 51749 refuted. 0 times theorem prover too weak. 702110 trivial. 0 not checked. [2021-11-19 14:23:19,653 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:23:19,653 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711189882] [2021-11-19 14:23:19,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711189882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:23:19,653 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312078572] [2021-11-19 14:23:19,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 14:23:19,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:23:19,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:23:19,655 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:23:19,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-19 14:23:20,905 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 14:23:20,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:23:20,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 5640 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-19 14:23:20,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:23:26,932 INFO L134 CoverageAnalysis]: Checked inductivity of 769205 backedges. 294231 proven. 38514 refuted. 0 times theorem prover too weak. 436460 trivial. 0 not checked. [2021-11-19 14:23:26,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:23:41,921 INFO L134 CoverageAnalysis]: Checked inductivity of 769205 backedges. 18167 proven. 56842 refuted. 0 times theorem prover too weak. 694196 trivial. 0 not checked. [2021-11-19 14:23:41,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312078572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:23:41,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1061137284] [2021-11-19 14:23:41,924 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:23:41,925 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:23:41,925 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:610) 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) [2021-11-19 14:23:41,925 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:23:41,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 41] total 46 [2021-11-19 14:23:41,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506138478] [2021-11-19 14:23:41,928 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:23:41,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-19 14:23:41,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:23:41,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-19 14:23:41,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1766, Unknown=0, NotChecked=0, Total=2070 [2021-11-19 14:23:41,935 INFO L87 Difference]: Start difference. First operand 194 states and 255 transitions. Second operand has 46 states, 46 states have (on average 5.956521739130435) internal successors, (274), 46 states have internal predecessors, (274), 41 states have call successors, (48), 4 states have call predecessors, (48), 20 states have return successors, (61), 22 states have call predecessors, (61), 39 states have call successors, (61) [2021-11-19 14:23:43,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:23:43,650 INFO L93 Difference]: Finished difference Result 502 states and 711 transitions. [2021-11-19 14:23:43,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-19 14:23:43,651 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.956521739130435) internal successors, (274), 46 states have internal predecessors, (274), 41 states have call successors, (48), 4 states have call predecessors, (48), 20 states have return successors, (61), 22 states have call predecessors, (61), 39 states have call successors, (61) Word has length 4556 [2021-11-19 14:23:43,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:23:43,656 INFO L225 Difference]: With dead ends: 502 [2021-11-19 14:23:43,656 INFO L226 Difference]: Without dead ends: 312 [2021-11-19 14:23:43,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9215 GetRequests, 9107 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2865 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2619, Invalid=8937, Unknown=0, NotChecked=0, Total=11556 [2021-11-19 14:23:43,661 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 1468 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 770 mSolverCounterSat, 1027 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1468 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 1797 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1027 IncrementalHoareTripleChecker+Valid, 770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 14:23:43,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1468 Valid, 208 Invalid, 1797 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1027 Valid, 770 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-19 14:23:43,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-11-19 14:23:43,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 207. [2021-11-19 14:23:43,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 165 states have internal predecessors, (169), 28 states have call successors, (28), 20 states have call predecessors, (28), 12 states have return successors, (81), 21 states have call predecessors, (81), 27 states have call successors, (81) [2021-11-19 14:23:43,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 278 transitions. [2021-11-19 14:23:43,680 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 278 transitions. Word has length 4556 [2021-11-19 14:23:43,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:23:43,682 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 278 transitions. [2021-11-19 14:23:43,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.956521739130435) internal successors, (274), 46 states have internal predecessors, (274), 41 states have call successors, (48), 4 states have call predecessors, (48), 20 states have return successors, (61), 22 states have call predecessors, (61), 39 states have call successors, (61) [2021-11-19 14:23:43,682 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 278 transitions. [2021-11-19 14:23:43,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2810 [2021-11-19 14:23:43,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:23:43,821 INFO L514 BasicCegarLoop]: trace histogram [287, 286, 232, 143, 143, 143, 143, 143, 143, 143, 143, 143, 143, 143, 142, 142, 89, 55, 1, 1, 1] [2021-11-19 14:23:43,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-19 14:23:44,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-19 14:23:44,045 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:23:44,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:23:44,047 INFO L85 PathProgramCache]: Analyzing trace with hash -2062189774, now seen corresponding path program 19 times [2021-11-19 14:23:44,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:23:44,047 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819469725] [2021-11-19 14:23:44,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:23:44,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:23:44,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:23:46,877 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 50344 proven. 69909 refuted. 0 times theorem prover too weak. 171523 trivial. 0 not checked. [2021-11-19 14:23:46,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:23:46,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819469725] [2021-11-19 14:23:46,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819469725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:23:46,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [229416341] [2021-11-19 14:23:46,878 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-19 14:23:46,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:23:46,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:23:46,878 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:23:46,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-19 14:23:48,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:23:48,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 5216 conjuncts, 573 conjunts are in the unsatisfiable core [2021-11-19 14:23:48,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:23:53,880 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 49486 proven. 53497 refuted. 0 times theorem prover too weak. 188793 trivial. 0 not checked. [2021-11-19 14:23:53,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:25:13,645 WARN L227 SmtUtils]: Spent 5.05s on a formula simplification that was a NOOP. DAG size: 797 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-19 14:25:18,876 WARN L227 SmtUtils]: Spent 5.21s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-19 14:25:23,995 WARN L227 SmtUtils]: Spent 5.09s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-19 14:26:42,619 INFO L134 CoverageAnalysis]: Checked inductivity of 291776 backedges. 53101 proven. 51887 refuted. 0 times theorem prover too weak. 186788 trivial. 0 not checked. [2021-11-19 14:26:42,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [229416341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:26:42,620 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [713315762] [2021-11-19 14:26:42,622 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-19 14:26:42,623 INFO L166 IcfgInterpreter]: Building call graph [2021-11-19 14:26:42,623 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:610) 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) [2021-11-19 14:26:42,625 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:26:42,628 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 30, 53] total 73 [2021-11-19 14:26:42,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957752145] [2021-11-19 14:26:42,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-19 14:26:42,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-19 14:26:42,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:26:42,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-19 14:26:42,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1153, Invalid=4249, Unknown=0, NotChecked=0, Total=5402 [2021-11-19 14:26:42,637 INFO L87 Difference]: Start difference. First operand 207 states and 278 transitions. Second operand has 74 states, 73 states have (on average 2.493150684931507) internal successors, (182), 74 states have internal predecessors, (182), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) [2021-11-19 14:26:43,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:26:43,023 INFO L93 Difference]: Finished difference Result 238 states and 338 transitions. [2021-11-19 14:26:43,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-19 14:26:43,024 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 2.493150684931507) internal successors, (182), 74 states have internal predecessors, (182), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) Word has length 2809 [2021-11-19 14:26:43,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:26:43,030 INFO L225 Difference]: With dead ends: 238 [2021-11-19 14:26:43,031 INFO L226 Difference]: Without dead ends: 237 [2021-11-19 14:26:43,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6193 GetRequests, 6117 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2700 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1274, Invalid=4732, Unknown=0, NotChecked=0, Total=6006 [2021-11-19 14:26:43,033 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 121 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 14:26:43,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 298 Invalid, 357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 14:26:43,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-11-19 14:26:43,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 227. [2021-11-19 14:26:43,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 182 states have (on average 1.0164835164835164) internal successors, (185), 180 states have internal predecessors, (185), 30 states have call successors, (30), 20 states have call predecessors, (30), 14 states have return successors, (109), 26 states have call predecessors, (109), 29 states have call successors, (109) [2021-11-19 14:26:43,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 324 transitions. [2021-11-19 14:26:43,056 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 324 transitions. Word has length 2809 [2021-11-19 14:26:43,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:26:43,059 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 324 transitions. [2021-11-19 14:26:43,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 2.493150684931507) internal successors, (182), 74 states have internal predecessors, (182), 20 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (51), 51 states have call predecessors, (51), 20 states have call successors, (51) [2021-11-19 14:26:43,060 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 324 transitions. [2021-11-19 14:26:43,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8479 [2021-11-19 14:26:43,638 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:26:43,642 INFO L514 BasicCegarLoop]: trace histogram [867, 861, 702, 435, 435, 435, 435, 431, 431, 431, 431, 431, 430, 430, 429, 429, 267, 165, 1, 1, 1] [2021-11-19 14:26:43,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-19 14:26:43,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-19 14:26:43,843 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2021-11-19 14:26:43,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:26:43,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1168136913, now seen corresponding path program 20 times [2021-11-19 14:26:43,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:26:43,847 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514020025] [2021-11-19 14:26:43,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:26:43,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:26:47,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:26:52,630 INFO L134 CoverageAnalysis]: Checked inductivity of 2667454 backedges. 25831 proven. 108316 refuted. 0 times theorem prover too weak. 2533307 trivial. 0 not checked. [2021-11-19 14:26:52,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:26:52,630 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514020025] [2021-11-19 14:26:52,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514020025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:26:52,631 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590904423] [2021-11-19 14:26:52,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:26:52,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:26:52,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:26:52,632 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:26:52,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ace93a5-e81e-4d28-95b6-26bd4651643d/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-19 14:27:06,615 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 452 check-sat command(s) [2021-11-19 14:27:06,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:27:06,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 11186 conjuncts, 1149 conjunts are in the unsatisfiable core [2021-11-19 14:27:06,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:27:24,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2667454 backedges. 821009 proven. 213263 refuted. 0 times theorem prover too weak. 1633182 trivial. 0 not checked. [2021-11-19 14:27:24,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:28:04,457 WARN L227 SmtUtils]: Spent 5.01s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-19 14:28:09,502 WARN L227 SmtUtils]: Spent 5.02s on a formula simplification that was a NOOP. DAG size: 799 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-19 14:28:41,252 WARN L227 SmtUtils]: Spent 12.85s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-19 14:28:54,175 WARN L227 SmtUtils]: Spent 12.77s on a formula simplification that was a NOOP. DAG size: 1292 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-19 14:29:07,275 WARN L227 SmtUtils]: Spent 13.07s on a formula simplification that was a NOOP. DAG size: 1294 (called from [L 231] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-19 14:29:20,646 WARN L227 SmtUtils]: Spent 13.29s on a formula simplification that was a NOOP. DAG size: 1294 (called from [L 268] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition)